Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

21 files changed, 6061 insertions, 0 deletions

diff --git a/third_party/rust/uuid/src/builder.rs b/third_party/rust/uuid/src/builder.rs
new file mode 100644
index 0000000000..60aeb435ea
--- /dev/null
+++ b/third_party/rust/uuid/src/builder.rs
@@ -0,0 +1,905 @@
+// Copyright 2013-2014 The Rust Project Developers.
+// Copyright 2018 The Uuid Project Developers.
+//
+// See the COPYRIGHT file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! A Builder type for [`Uuid`]s.
+//!
+//! [`Uuid`]: ../struct.Uuid.html
+
+use crate::{error::*, timestamp, Bytes, Uuid, Variant, Version};
+
+/// A builder for creating a UUID.
+///
+/// This type is useful if you need to mutate individual fields of a [`Uuid`]
+/// while constructing it. Since the [`Uuid`] type is `Copy`, it doesn't offer
+/// any methods to mutate in place. They live on the `Builder` instead.
+///
+/// The `Builder` type also always exposes APIs to construct [`Uuid`]s for any
+/// version without needing crate features or additional dependencies. It's a
+/// lower-level API than the methods on [`Uuid`].
+///
+/// # Examples
+///
+/// Creating a version 4 UUID from externally generated random bytes:
+///
+/// ```
+/// # use uuid::{Builder, Version, Variant};
+/// # let rng = || [
+/// #     70, 235, 208, 238, 14, 109, 67, 201, 185, 13, 204, 195, 90,
+/// # 145, 63, 62,
+/// # ];
+/// let random_bytes = rng();
+///
+/// let uuid = Builder::from_random_bytes(random_bytes).into_uuid();
+///
+/// assert_eq!(Some(Version::Random), uuid.get_version());
+/// assert_eq!(Variant::RFC4122, uuid.get_variant());
+/// ```
+#[allow(missing_copy_implementations)]
+#[derive(Debug)]
+pub struct Builder(Uuid);
+
+impl Uuid {
+    /// The 'nil UUID' (all zeros).
+    ///
+    /// The nil UUID is a special form of UUID that is specified to have all
+    /// 128 bits set to zero.
+    ///
+    /// # References
+    ///
+    /// * [Nil UUID in RFC4122](https://tools.ietf.org/html/rfc4122.html#section-4.1.7)
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let uuid = Uuid::nil();
+    ///
+    /// assert_eq!(
+    ///     "00000000-0000-0000-0000-000000000000",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn nil() -> Self {
+        Uuid::from_bytes([0; 16])
+    }
+
+    /// The 'max UUID' (all ones).
+    ///
+    /// The max UUID is a special form of UUID that is specified to have all
+    /// 128 bits set to one.
+    ///
+    /// # References
+    ///
+    /// * [Max UUID in Draft RFC: New UUID Formats, Version 4](https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04#section-5.4)
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let uuid = Uuid::max();
+    ///
+    /// assert_eq!(
+    ///     "ffffffff-ffff-ffff-ffff-ffffffffffff",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    #[cfg(uuid_unstable)]
+    pub const fn max() -> Self {
+        Uuid::from_bytes([0xFF; 16])
+    }
+
+    /// Creates a UUID from four field values.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let d1 = 0xa1a2a3a4;
+    /// let d2 = 0xb1b2;
+    /// let d3 = 0xc1c2;
+    /// let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
+    ///
+    /// let uuid = Uuid::from_fields(d1, d2, d3, &d4);
+    ///
+    /// assert_eq!(
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn from_fields(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Uuid {
+        Uuid::from_bytes([
+            (d1 >> 24) as u8,
+            (d1 >> 16) as u8,
+            (d1 >> 8) as u8,
+            d1 as u8,
+            (d2 >> 8) as u8,
+            d2 as u8,
+            (d3 >> 8) as u8,
+            d3 as u8,
+            d4[0],
+            d4[1],
+            d4[2],
+            d4[3],
+            d4[4],
+            d4[5],
+            d4[6],
+            d4[7],
+        ])
+    }
+
+    /// Creates a UUID from four field values in little-endian order.
+    ///
+    /// The bytes in the `d1`, `d2` and `d3` fields will be flipped to convert
+    /// into big-endian order. This is based on the endianness of the UUID,
+    /// rather than the target environment so bytes will be flipped on both
+    /// big and little endian machines.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let d1 = 0xa1a2a3a4;
+    /// let d2 = 0xb1b2;
+    /// let d3 = 0xc1c2;
+    /// let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
+    ///
+    /// let uuid = Uuid::from_fields_le(d1, d2, d3, &d4);
+    ///
+    /// assert_eq!(
+    ///     "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn from_fields_le(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Uuid {
+        Uuid::from_bytes([
+            d1 as u8,
+            (d1 >> 8) as u8,
+            (d1 >> 16) as u8,
+            (d1 >> 24) as u8,
+            (d2) as u8,
+            (d2 >> 8) as u8,
+            d3 as u8,
+            (d3 >> 8) as u8,
+            d4[0],
+            d4[1],
+            d4[2],
+            d4[3],
+            d4[4],
+            d4[5],
+            d4[6],
+            d4[7],
+        ])
+    }
+
+    /// Creates a UUID from a 128bit value.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let v = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8u128;
+    ///
+    /// let uuid = Uuid::from_u128(v);
+    ///
+    /// assert_eq!(
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn from_u128(v: u128) -> Self {
+        Uuid::from_bytes([
+            (v >> 120) as u8,
+            (v >> 112) as u8,
+            (v >> 104) as u8,
+            (v >> 96) as u8,
+            (v >> 88) as u8,
+            (v >> 80) as u8,
+            (v >> 72) as u8,
+            (v >> 64) as u8,
+            (v >> 56) as u8,
+            (v >> 48) as u8,
+            (v >> 40) as u8,
+            (v >> 32) as u8,
+            (v >> 24) as u8,
+            (v >> 16) as u8,
+            (v >> 8) as u8,
+            v as u8,
+        ])
+    }
+
+    /// Creates a UUID from a 128bit value in little-endian order.
+    ///
+    /// The entire value will be flipped to convert into big-endian order.
+    /// This is based on the endianness of the UUID, rather than the target
+    /// environment so bytes will be flipped on both big and little endian
+    /// machines.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let v = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8u128;
+    ///
+    /// let uuid = Uuid::from_u128_le(v);
+    ///
+    /// assert_eq!(
+    ///     "d8d7d6d5-d4d3-d2d1-c2c1-b2b1a4a3a2a1",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn from_u128_le(v: u128) -> Self {
+        Uuid::from_bytes([
+            v as u8,
+            (v >> 8) as u8,
+            (v >> 16) as u8,
+            (v >> 24) as u8,
+            (v >> 32) as u8,
+            (v >> 40) as u8,
+            (v >> 48) as u8,
+            (v >> 56) as u8,
+            (v >> 64) as u8,
+            (v >> 72) as u8,
+            (v >> 80) as u8,
+            (v >> 88) as u8,
+            (v >> 96) as u8,
+            (v >> 104) as u8,
+            (v >> 112) as u8,
+            (v >> 120) as u8,
+        ])
+    }
+
+    /// Creates a UUID from two 64bit values.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let hi = 0xa1a2a3a4b1b2c1c2u64;
+    /// let lo = 0xd1d2d3d4d5d6d7d8u64;
+    ///
+    /// let uuid = Uuid::from_u64_pair(hi, lo);
+    ///
+    /// assert_eq!(
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn from_u64_pair(high_bits: u64, low_bits: u64) -> Self {
+        Uuid::from_bytes([
+            (high_bits >> 56) as u8,
+            (high_bits >> 48) as u8,
+            (high_bits >> 40) as u8,
+            (high_bits >> 32) as u8,
+            (high_bits >> 24) as u8,
+            (high_bits >> 16) as u8,
+            (high_bits >> 8) as u8,
+            high_bits as u8,
+            (low_bits >> 56) as u8,
+            (low_bits >> 48) as u8,
+            (low_bits >> 40) as u8,
+            (low_bits >> 32) as u8,
+            (low_bits >> 24) as u8,
+            (low_bits >> 16) as u8,
+            (low_bits >> 8) as u8,
+            low_bits as u8,
+        ])
+    }
+
+    /// Creates a UUID using the supplied bytes.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if `b` has any length other than 16.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// # use uuid::Uuid;
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    ///
+    /// let uuid = Uuid::from_slice(&bytes)?;
+    ///
+    /// assert_eq!(
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn from_slice(b: &[u8]) -> Result<Uuid, Error> {
+        if b.len() != 16 {
+            return Err(Error(ErrorKind::ByteLength { len: b.len() }));
+        }
+
+        let mut bytes: Bytes = [0; 16];
+        bytes.copy_from_slice(b);
+        Ok(Uuid::from_bytes(bytes))
+    }
+
+    /// Creates a UUID using the supplied bytes in little endian order.
+    ///
+    /// The individual fields encoded in the buffer will be flipped.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if `b` has any length other than 16.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// # use uuid::Uuid;
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    ///
+    /// let uuid = Uuid::from_slice_le(&bytes)?;
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8"
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn from_slice_le(b: &[u8]) -> Result<Uuid, Error> {
+        if b.len() != 16 {
+            return Err(Error(ErrorKind::ByteLength { len: b.len() }));
+        }
+
+        let mut bytes: Bytes = [0; 16];
+        bytes.copy_from_slice(b);
+        Ok(Uuid::from_bytes_le(bytes))
+    }
+
+    /// Creates a UUID using the supplied bytes.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// # use uuid::Uuid;
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    ///
+    /// let uuid = Uuid::from_bytes(bytes);
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8"
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub const fn from_bytes(bytes: Bytes) -> Uuid {
+        Uuid(bytes)
+    }
+
+    /// Creates a UUID using the supplied bytes in little endian order.
+    ///
+    /// The individual fields encoded in the buffer will be flipped.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// # use uuid::Uuid;
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    ///
+    /// let uuid = Uuid::from_bytes_le(bytes);
+    ///
+    /// assert_eq!(
+    ///     "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub const fn from_bytes_le(b: Bytes) -> Uuid {
+        Uuid([
+            b[3], b[2], b[1], b[0], b[5], b[4], b[7], b[6], b[8], b[9], b[10], b[11], b[12], b[13],
+            b[14], b[15],
+        ])
+    }
+
+    /// Creates a reference to a UUID from a reference to the supplied bytes.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// # use uuid::Uuid;
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    ///
+    /// let uuid = Uuid::from_bytes_ref(&bytes);
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8"
+    /// );
+    ///
+    /// assert!(std::ptr::eq(
+    ///     uuid as *const Uuid as *const u8,
+    ///     &bytes as *const [u8; 16] as *const u8,
+    /// ));
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn from_bytes_ref(bytes: &Bytes) -> &Uuid {
+        // SAFETY: `Bytes` and `Uuid` have the same ABI
+        unsafe { &*(bytes as *const Bytes as *const Uuid) }
+    }
+
+    // NOTE: There is no `from_u128_ref` because in little-endian
+    // environments the value isn't properly encoded. Callers would
+    // need to use `.to_be()` themselves.
+}
+
+impl Builder {
+    /// Creates a `Builder` using the supplied bytes.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    ///
+    /// let uuid = Builder::from_bytes(bytes).into_uuid();
+    ///
+    /// assert_eq!(
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn from_bytes(b: Bytes) -> Self {
+        Builder(Uuid::from_bytes(b))
+    }
+
+    /// Creates a `Builder` using the supplied bytes in little endian order.
+    ///
+    /// The individual fields encoded in the buffer will be flipped.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// # use uuid::{Builder, Uuid};
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    ///
+    /// let uuid = Builder::from_bytes_le(bytes).into_uuid();
+    ///
+    /// assert_eq!(
+    ///     "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub const fn from_bytes_le(b: Bytes) -> Self {
+        Builder(Uuid::from_bytes_le(b))
+    }
+
+    /// Creates a `Builder` for a version 1 UUID using the supplied timestamp and node ID.
+    pub const fn from_rfc4122_timestamp(ticks: u64, counter: u16, node_id: &[u8; 6]) -> Self {
+        Builder(timestamp::encode_rfc4122_timestamp(ticks, counter, node_id))
+    }
+
+    /// Creates a `Builder` for a version 3 UUID using the supplied MD5 hashed bytes.
+    pub const fn from_md5_bytes(md5_bytes: Bytes) -> Self {
+        Builder(Uuid::from_bytes(md5_bytes))
+            .with_variant(Variant::RFC4122)
+            .with_version(Version::Md5)
+    }
+
+    /// Creates a `Builder` for a version 4 UUID using the supplied random bytes.
+    ///
+    /// This method assumes the bytes are already sufficiently random, it will only
+    /// set the appropriate bits for the UUID version and variant.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use uuid::{Builder, Variant, Version};
+    /// # let rng = || [
+    /// #     70, 235, 208, 238, 14, 109, 67, 201, 185, 13, 204, 195, 90,
+    /// # 145, 63, 62,
+    /// # ];
+    /// let random_bytes = rng();
+    /// let uuid = Builder::from_random_bytes(random_bytes).into_uuid();
+    ///
+    /// assert_eq!(Some(Version::Random), uuid.get_version());
+    /// assert_eq!(Variant::RFC4122, uuid.get_variant());
+    /// ```
+    pub const fn from_random_bytes(random_bytes: Bytes) -> Self {
+        Builder(Uuid::from_bytes(random_bytes))
+            .with_variant(Variant::RFC4122)
+            .with_version(Version::Random)
+    }
+
+    /// Creates a `Builder` for a version 5 UUID using the supplied SHA-1 hashed bytes.
+    ///
+    /// This method assumes the bytes are already a SHA-1 hash, it will only set the appropriate
+    /// bits for the UUID version and variant.
+    pub const fn from_sha1_bytes(sha1_bytes: Bytes) -> Self {
+        Builder(Uuid::from_bytes(sha1_bytes))
+            .with_variant(Variant::RFC4122)
+            .with_version(Version::Sha1)
+    }
+
+    /// Creates a `Builder` for a version 6 UUID using the supplied timestamp and node ID.
+    ///
+    /// This method will encode the ticks, counter, and node ID in a sortable UUID.
+    #[cfg(uuid_unstable)]
+    pub const fn from_sorted_rfc4122_timestamp(
+        ticks: u64,
+        counter: u16,
+        node_id: &[u8; 6],
+    ) -> Self {
+        Builder(timestamp::encode_sorted_rfc4122_timestamp(
+            ticks, counter, node_id,
+        ))
+    }
+
+    /// Creates a `Builder` for a version 7 UUID using the supplied Unix timestamp and random bytes.
+    ///
+    /// This method assumes the bytes are already sufficiently random.
+    ///
+    /// # Examples
+    ///
+    /// Creating a UUID using the current system timestamp:
+    ///
+    /// ```
+    /// # use std::convert::TryInto;
+    /// use std::time::{Duration, SystemTime};
+    /// # fn main() -> Result<(), Box<dyn std::error::Error>> {
+    /// # use uuid::{Builder, Uuid, Variant, Version, Timestamp, NoContext};
+    /// # let rng = || [
+    /// #     70, 235, 208, 238, 14, 109, 67, 201, 185, 13
+    /// # ];
+    /// let ts = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
+    ///
+    /// let random_bytes = rng();
+    ///
+    /// let uuid = Builder::from_unix_timestamp_millis(ts.as_millis().try_into()?, &random_bytes).into_uuid();
+    ///
+    /// assert_eq!(Some(Version::SortRand), uuid.get_version());
+    /// assert_eq!(Variant::RFC4122, uuid.get_variant());
+    /// # Ok(())
+    /// # }
+    /// ```
+    #[cfg(uuid_unstable)]
+    pub const fn from_unix_timestamp_millis(millis: u64, random_bytes: &[u8; 10]) -> Self {
+        Builder(timestamp::encode_unix_timestamp_millis(
+            millis,
+            random_bytes,
+        ))
+    }
+
+    /// Creates a `Builder` for a version 8 UUID using the supplied user-defined bytes.
+    ///
+    /// This method won't interpret the given bytes in any way, except to set the appropriate
+    /// bits for the UUID version and variant.
+    #[cfg(uuid_unstable)]
+    pub const fn from_custom_bytes(custom_bytes: Bytes) -> Self {
+        Builder::from_bytes(custom_bytes)
+            .with_variant(Variant::RFC4122)
+            .with_version(Version::Custom)
+    }
+
+    /// Creates a `Builder` using the supplied bytes.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if `b` has any length other than 16.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    ///
+    /// let uuid = Builder::from_slice(&bytes)?.into_uuid();
+    ///
+    /// assert_eq!(
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn from_slice(b: &[u8]) -> Result<Self, Error> {
+        Ok(Builder(Uuid::from_slice(b)?))
+    }
+
+    /// Creates a `Builder` using the supplied bytes in little endian order.
+    ///
+    /// The individual fields encoded in the buffer will be flipped.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if `b` has any length other than 16.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    ///
+    /// let uuid = Builder::from_slice_le(&bytes)?.into_uuid();
+    ///
+    /// assert_eq!(
+    ///     "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn from_slice_le(b: &[u8]) -> Result<Self, Error> {
+        Ok(Builder(Uuid::from_slice_le(b)?))
+    }
+
+    /// Creates a `Builder` from four field values.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// let d1 = 0xa1a2a3a4;
+    /// let d2 = 0xb1b2;
+    /// let d3 = 0xc1c2;
+    /// let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
+    ///
+    /// let uuid = Builder::from_fields(d1, d2, d3, &d4).into_uuid();
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8"
+    /// );
+    /// ```
+    pub const fn from_fields(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Self {
+        Builder(Uuid::from_fields(d1, d2, d3, d4))
+    }
+
+    /// Creates a `Builder` from four field values.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// let d1 = 0xa1a2a3a4;
+    /// let d2 = 0xb1b2;
+    /// let d3 = 0xc1c2;
+    /// let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
+    ///
+    /// let uuid = Builder::from_fields_le(d1, d2, d3, &d4).into_uuid();
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "a4a3a2a1-b2b1-c2c1-d1d2-d3d4d5d6d7d8"
+    /// );
+    /// ```
+    pub const fn from_fields_le(d1: u32, d2: u16, d3: u16, d4: &[u8; 8]) -> Self {
+        Builder(Uuid::from_fields_le(d1, d2, d3, d4))
+    }
+
+    /// Creates a `Builder` from a 128bit value.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// let v = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8u128;
+    ///
+    /// let uuid = Builder::from_u128(v).into_uuid();
+    ///
+    /// assert_eq!(
+    ///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn from_u128(v: u128) -> Self {
+        Builder(Uuid::from_u128(v))
+    }
+
+    /// Creates a UUID from a 128bit value in little-endian order.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// let v = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8u128;
+    ///
+    /// let uuid = Builder::from_u128_le(v).into_uuid();
+    ///
+    /// assert_eq!(
+    ///     "d8d7d6d5-d4d3-d2d1-c2c1-b2b1a4a3a2a1",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn from_u128_le(v: u128) -> Self {
+        Builder(Uuid::from_u128_le(v))
+    }
+
+    /// Creates a `Builder` with an initial [`Uuid::nil`].
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// let uuid = Builder::nil().into_uuid();
+    ///
+    /// assert_eq!(
+    ///     "00000000-0000-0000-0000-000000000000",
+    ///     uuid.hyphenated().to_string(),
+    /// );
+    /// ```
+    pub const fn nil() -> Self {
+        Builder(Uuid::nil())
+    }
+
+    /// Specifies the variant of the UUID.
+    pub fn set_variant(&mut self, v: Variant) -> &mut Self {
+        *self = Builder(self.0).with_variant(v);
+        self
+    }
+
+    /// Specifies the variant of the UUID.
+    pub const fn with_variant(mut self, v: Variant) -> Self {
+        let byte = (self.0).0[8];
+
+        (self.0).0[8] = match v {
+            Variant::NCS => byte & 0x7f,
+            Variant::RFC4122 => (byte & 0x3f) | 0x80,
+            Variant::Microsoft => (byte & 0x1f) | 0xc0,
+            Variant::Future => byte | 0xe0,
+        };
+
+        self
+    }
+
+    /// Specifies the version number of the UUID.
+    pub fn set_version(&mut self, v: Version) -> &mut Self {
+        *self = Builder(self.0).with_version(v);
+        self
+    }
+
+    /// Specifies the version number of the UUID.
+    pub const fn with_version(mut self, v: Version) -> Self {
+        (self.0).0[6] = ((self.0).0[6] & 0x0f) | ((v as u8) << 4);
+
+        self
+    }
+
+    /// Get a reference to the underlying [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// let builder = Builder::nil();
+    ///
+    /// let uuid1 = builder.as_uuid();
+    /// let uuid2 = builder.as_uuid();
+    ///
+    /// assert_eq!(uuid1, uuid2);
+    /// ```
+    pub const fn as_uuid(&self) -> &Uuid {
+        &self.0
+    }
+
+    /// Convert the builder into a [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Builder;
+    /// let uuid = Builder::nil().into_uuid();
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "00000000-0000-0000-0000-000000000000"
+    /// );
+    /// ```
+    pub const fn into_uuid(self) -> Uuid {
+        self.0
+    }
+}
diff --git a/third_party/rust/uuid/src/error.rs b/third_party/rust/uuid/src/error.rs
new file mode 100644
index 0000000000..e9aecbf82c
--- /dev/null
+++ b/third_party/rust/uuid/src/error.rs
@@ -0,0 +1,172 @@
+use crate::std::fmt;
+
+/// A general error that can occur when working with UUIDs.
+#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+pub struct Error(pub(crate) ErrorKind);
+
+#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+pub(crate) enum ErrorKind {
+    /// Invalid character in the [`Uuid`] string.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    Char { character: char, index: usize },
+    /// A simple [`Uuid`] didn't contain 32 characters.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    SimpleLength { len: usize },
+    /// A byte array didn't contain 16 bytes
+    ByteLength { len: usize },
+    /// A hyphenated [`Uuid`] didn't contain 5 groups
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    GroupCount { count: usize },
+    /// A hyphenated [`Uuid`] had a group that wasn't the right length
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    GroupLength {
+        group: usize,
+        len: usize,
+        index: usize,
+    },
+    /// The input was not a valid UTF8 string
+    InvalidUTF8,
+    /// Some other error occurred.
+    Other,
+}
+
+/// A string that is guaranteed to fail to parse to a [`Uuid`].
+///
+/// This type acts as a lightweight error indicator, suggesting
+/// that the string cannot be parsed but offering no error
+/// details. To get details, use `InvalidUuid::into_err`.
+///
+/// [`Uuid`]: ../struct.Uuid.html
+#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+pub struct InvalidUuid<'a>(pub(crate) &'a [u8]);
+
+impl<'a> InvalidUuid<'a> {
+    /// Converts the lightweight error type into detailed diagnostics.
+    pub fn into_err(self) -> Error {
+        // Check whether or not the input was ever actually a valid UTF8 string
+        let input_str = match std::str::from_utf8(self.0) {
+            Ok(s) => s,
+            Err(_) => return Error(ErrorKind::InvalidUTF8),
+        };
+
+        let (uuid_str, offset, simple) = match input_str.as_bytes() {
+            [b'{', s @ .., b'}'] => (s, 1, false),
+            [b'u', b'r', b'n', b':', b'u', b'u', b'i', b'd', b':', s @ ..] => {
+                (s, "urn:uuid:".len(), false)
+            }
+            s => (s, 0, true),
+        };
+
+        let mut hyphen_count = 0;
+        let mut group_bounds = [0; 4];
+
+        // SAFETY: the byte array came from a valid utf8 string,
+        // and is aligned along char boundaries.
+        let uuid_str = unsafe { std::str::from_utf8_unchecked(uuid_str) };
+
+        for (index, character) in uuid_str.char_indices() {
+            let byte = character as u8;
+            if character as u32 - byte as u32 > 0 {
+                // Multibyte char
+                return Error(ErrorKind::Char {
+                    character,
+                    index: index + offset + 1,
+                });
+            } else if byte == b'-' {
+                // While we search, also count group breaks
+                if hyphen_count < 4 {
+                    group_bounds[hyphen_count] = index;
+                }
+                hyphen_count += 1;
+            } else if !matches!(byte, b'0'..=b'9' | b'a'..=b'f' | b'A'..=b'F') {
+                // Non-hex char
+                return Error(ErrorKind::Char {
+                    character: byte as char,
+                    index: index + offset + 1,
+                });
+            }
+        }
+
+        if hyphen_count == 0 && simple {
+            // This means that we tried and failed to parse a simple uuid.
+            // Since we verified that all the characters are valid, this means
+            // that it MUST have an invalid length.
+            Error(ErrorKind::SimpleLength {
+                len: input_str.len(),
+            })
+        } else if hyphen_count != 4 {
+            // We tried to parse a hyphenated variant, but there weren't
+            // 5 groups (4 hyphen splits).
+            Error(ErrorKind::GroupCount {
+                count: hyphen_count + 1,
+            })
+        } else {
+            // There are 5 groups, one of them has an incorrect length
+            const BLOCK_STARTS: [usize; 5] = [0, 9, 14, 19, 24];
+            for i in 0..4 {
+                if group_bounds[i] != BLOCK_STARTS[i + 1] - 1 {
+                    return Error(ErrorKind::GroupLength {
+                        group: i,
+                        len: group_bounds[i] - BLOCK_STARTS[i],
+                        index: offset + BLOCK_STARTS[i] + 1,
+                    });
+                }
+            }
+
+            // The last group must be too long
+            Error(ErrorKind::GroupLength {
+                group: 4,
+                len: input_str.len() - BLOCK_STARTS[4],
+                index: offset + BLOCK_STARTS[4] + 1,
+            })
+        }
+    }
+}
+
+// NOTE: This impl is part of the public API. Breaking changes to it should be carefully considered
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self.0 {
+            ErrorKind::Char {
+                character, index, ..
+            } => {
+                write!(f, "invalid character: expected an optional prefix of `urn:uuid:` followed by [0-9a-fA-F-], found `{}` at {}", character, index)
+            }
+            ErrorKind::SimpleLength { len } => {
+                write!(
+                    f,
+                    "invalid length: expected length 32 for simple format, found {}",
+                    len
+                )
+            }
+            ErrorKind::ByteLength { len } => {
+                write!(f, "invalid length: expected 16 bytes, found {}", len)
+            }
+            ErrorKind::GroupCount { count } => {
+                write!(f, "invalid group count: expected 5, found {}", count)
+            }
+            ErrorKind::GroupLength { group, len, .. } => {
+                let expected = [8, 4, 4, 4, 12][group];
+                write!(
+                    f,
+                    "invalid group length in group {}: expected {}, found {}",
+                    group, expected, len
+                )
+            }
+            ErrorKind::InvalidUTF8 => write!(f, "non-UTF8 input"),
+            ErrorKind::Other => write!(f, "failed to parse a UUID"),
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+mod std_support {
+    use super::*;
+    use crate::std::error;
+
+    impl error::Error for Error {}
+}
diff --git a/third_party/rust/uuid/src/external.rs b/third_party/rust/uuid/src/external.rs
new file mode 100644
index 0000000000..219a9236e5
--- /dev/null
+++ b/third_party/rust/uuid/src/external.rs
@@ -0,0 +1,6 @@
+#[cfg(feature = "arbitrary")]
+pub(crate) mod arbitrary_support;
+#[cfg(feature = "serde")]
+pub(crate) mod serde_support;
+#[cfg(feature = "slog")]
+pub(crate) mod slog_support;
diff --git a/third_party/rust/uuid/src/external/arbitrary_support.rs b/third_party/rust/uuid/src/external/arbitrary_support.rs
new file mode 100644
index 0000000000..38cce7c73e
--- /dev/null
+++ b/third_party/rust/uuid/src/external/arbitrary_support.rs
@@ -0,0 +1,45 @@
+use crate::{std::convert::TryInto, Builder, Uuid};
+
+use arbitrary::{Arbitrary, Unstructured};
+
+impl Arbitrary<'_> for Uuid {
+    fn arbitrary(u: &mut Unstructured<'_>) -> arbitrary::Result<Self> {
+        let b = u
+            .bytes(16)?
+            .try_into()
+            .map_err(|_| arbitrary::Error::NotEnoughData)?;
+
+        Ok(Builder::from_random_bytes(b).into_uuid())
+    }
+
+    fn size_hint(depth: usize) -> (usize, Option<usize>) {
+        (16, Some(16))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use crate::{Variant, Version};
+
+    #[test]
+    fn test_arbitrary() {
+        let mut bytes = Unstructured::new(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
+
+        let uuid = Uuid::arbitrary(&mut bytes).unwrap();
+
+        assert_eq!(Some(Version::Random), uuid.get_version());
+        assert_eq!(Variant::RFC4122, uuid.get_variant());
+    }
+
+    #[test]
+    fn test_arbitrary_empty() {
+        let mut bytes = Unstructured::new(&[]);
+
+        // Ensure we don't panic when building an arbitrary `Uuid`
+        let uuid = Uuid::arbitrary(&mut bytes);
+
+        assert!(uuid.is_err());
+    }
+}
diff --git a/third_party/rust/uuid/src/external/serde_support.rs b/third_party/rust/uuid/src/external/serde_support.rs
new file mode 100644
index 0000000000..5228daf15f
--- /dev/null
+++ b/third_party/rust/uuid/src/external/serde_support.rs
@@ -0,0 +1,313 @@
+// Copyright 2013-2014 The Rust Project Developers.
+// Copyright 2018 The Uuid Project Developers.
+//
+// See the COPYRIGHT file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use crate::{
+    error::*,
+    fmt::{Braced, Hyphenated, Simple, Urn},
+    std::fmt,
+    Uuid,
+};
+use serde::{
+    de::{self, Error as _},
+    Deserialize, Deserializer, Serialize, Serializer,
+};
+
+impl Serialize for Uuid {
+    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        if serializer.is_human_readable() {
+            serializer.serialize_str(self.hyphenated().encode_lower(&mut Uuid::encode_buffer()))
+        } else {
+            serializer.serialize_bytes(self.as_bytes())
+        }
+    }
+}
+
+impl Serialize for Hyphenated {
+    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        serializer.serialize_str(self.encode_lower(&mut Uuid::encode_buffer()))
+    }
+}
+
+impl Serialize for Simple {
+    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        serializer.serialize_str(self.encode_lower(&mut Uuid::encode_buffer()))
+    }
+}
+
+impl Serialize for Urn {
+    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        serializer.serialize_str(self.encode_lower(&mut Uuid::encode_buffer()))
+    }
+}
+
+impl Serialize for Braced {
+    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        serializer.serialize_str(self.encode_lower(&mut Uuid::encode_buffer()))
+    }
+}
+
+impl<'de> Deserialize<'de> for Uuid {
+    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        fn de_error<E: de::Error>(e: Error) -> E {
+            E::custom(format_args!("UUID parsing failed: {}", e))
+        }
+
+        if deserializer.is_human_readable() {
+            struct UuidVisitor;
+
+            impl<'vi> de::Visitor<'vi> for UuidVisitor {
+                type Value = Uuid;
+
+                fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                    write!(formatter, "a UUID string")
+                }
+
+                fn visit_str<E: de::Error>(self, value: &str) -> Result<Uuid, E> {
+                    value.parse::<Uuid>().map_err(de_error)
+                }
+
+                fn visit_bytes<E: de::Error>(self, value: &[u8]) -> Result<Uuid, E> {
+                    Uuid::from_slice(value).map_err(de_error)
+                }
+
+                fn visit_seq<A>(self, mut seq: A) -> Result<Uuid, A::Error>
+                where
+                    A: de::SeqAccess<'vi>,
+                {
+                    #[rustfmt::skip]
+                    let bytes = [
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                        match seq.next_element()? { Some(e) => e, None => return Err(A::Error::invalid_length(16, &self)) },
+                    ];
+
+                    Ok(Uuid::from_bytes(bytes))
+                }
+            }
+
+            deserializer.deserialize_str(UuidVisitor)
+        } else {
+            struct UuidBytesVisitor;
+
+            impl<'vi> de::Visitor<'vi> for UuidBytesVisitor {
+                type Value = Uuid;
+
+                fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                    write!(formatter, "bytes")
+                }
+
+                fn visit_bytes<E: de::Error>(self, value: &[u8]) -> Result<Uuid, E> {
+                    Uuid::from_slice(value).map_err(de_error)
+                }
+            }
+
+            deserializer.deserialize_bytes(UuidBytesVisitor)
+        }
+    }
+}
+
+pub mod compact {
+    //! Serialize a [`Uuid`] as a `[u8; 16]`.
+    //!
+    //! [`Uuid`]: ../../struct.Uuid.html
+
+    /// Serialize from a [`Uuid`] as a `[u8; 16]`
+    ///
+    /// [`Uuid`]: ../../struct.Uuid.html
+    pub fn serialize<S>(u: &crate::Uuid, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serde::Serialize::serialize(u.as_bytes(), serializer)
+    }
+
+    /// Deserialize a `[u8; 16]` as a [`Uuid`]
+    ///
+    /// [`Uuid`]: ../../struct.Uuid.html
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<crate::Uuid, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let bytes: [u8; 16] = serde::Deserialize::deserialize(deserializer)?;
+
+        Ok(crate::Uuid::from_bytes(bytes))
+    }
+
+    #[cfg(test)]
+    mod tests {
+        use serde_derive::*;
+        use serde_test::{self, Configure};
+
+        #[test]
+        fn test_serialize_compact() {
+            #[derive(Serialize, Debug, Deserialize, PartialEq)]
+            struct UuidContainer {
+                #[serde(with = "crate::serde::compact")]
+                u: crate::Uuid,
+            }
+
+            let uuid_bytes = b"F9168C5E-CEB2-4F";
+            let container = UuidContainer {
+                u: crate::Uuid::from_slice(uuid_bytes).unwrap(),
+            };
+
+            // more complex because of the struct wrapping the actual UUID
+            // serialization
+            serde_test::assert_tokens(
+                &container.compact(),
+                &[
+                    serde_test::Token::Struct {
+                        name: "UuidContainer",
+                        len: 1,
+                    },
+                    serde_test::Token::Str("u"),
+                    serde_test::Token::Tuple { len: 16 },
+                    serde_test::Token::U8(uuid_bytes[0]),
+                    serde_test::Token::U8(uuid_bytes[1]),
+                    serde_test::Token::U8(uuid_bytes[2]),
+                    serde_test::Token::U8(uuid_bytes[3]),
+                    serde_test::Token::U8(uuid_bytes[4]),
+                    serde_test::Token::U8(uuid_bytes[5]),
+                    serde_test::Token::U8(uuid_bytes[6]),
+                    serde_test::Token::U8(uuid_bytes[7]),
+                    serde_test::Token::U8(uuid_bytes[8]),
+                    serde_test::Token::U8(uuid_bytes[9]),
+                    serde_test::Token::U8(uuid_bytes[10]),
+                    serde_test::Token::U8(uuid_bytes[11]),
+                    serde_test::Token::U8(uuid_bytes[12]),
+                    serde_test::Token::U8(uuid_bytes[13]),
+                    serde_test::Token::U8(uuid_bytes[14]),
+                    serde_test::Token::U8(uuid_bytes[15]),
+                    serde_test::Token::TupleEnd,
+                    serde_test::Token::StructEnd,
+                ],
+            )
+        }
+    }
+}
+
+#[cfg(test)]
+mod serde_tests {
+    use super::*;
+
+    use serde_test::{Compact, Configure, Readable, Token};
+
+    #[test]
+    fn test_serialize_readable_string() {
+        let uuid_str = "f9168c5e-ceb2-4faa-b6bf-329bf39fa1e4";
+        let u = Uuid::parse_str(uuid_str).unwrap();
+        serde_test::assert_tokens(&u.readable(), &[Token::Str(uuid_str)]);
+    }
+
+    #[test]
+    fn test_deserialize_readable_compact() {
+        let uuid_bytes = b"F9168C5E-CEB2-4F";
+        let u = Uuid::from_slice(uuid_bytes).unwrap();
+
+        serde_test::assert_de_tokens(
+            &u.readable(),
+            &[
+                serde_test::Token::Tuple { len: 16 },
+                serde_test::Token::U8(uuid_bytes[0]),
+                serde_test::Token::U8(uuid_bytes[1]),
+                serde_test::Token::U8(uuid_bytes[2]),
+                serde_test::Token::U8(uuid_bytes[3]),
+                serde_test::Token::U8(uuid_bytes[4]),
+                serde_test::Token::U8(uuid_bytes[5]),
+                serde_test::Token::U8(uuid_bytes[6]),
+                serde_test::Token::U8(uuid_bytes[7]),
+                serde_test::Token::U8(uuid_bytes[8]),
+                serde_test::Token::U8(uuid_bytes[9]),
+                serde_test::Token::U8(uuid_bytes[10]),
+                serde_test::Token::U8(uuid_bytes[11]),
+                serde_test::Token::U8(uuid_bytes[12]),
+                serde_test::Token::U8(uuid_bytes[13]),
+                serde_test::Token::U8(uuid_bytes[14]),
+                serde_test::Token::U8(uuid_bytes[15]),
+                serde_test::Token::TupleEnd,
+            ],
+        );
+    }
+
+    #[test]
+    fn test_deserialize_readable_bytes() {
+        let uuid_bytes = b"F9168C5E-CEB2-4F";
+        let u = Uuid::from_slice(uuid_bytes).unwrap();
+
+        serde_test::assert_de_tokens(&u.readable(), &[serde_test::Token::Bytes(uuid_bytes)]);
+    }
+
+    #[test]
+    fn test_serialize_hyphenated() {
+        let uuid_str = "f9168c5e-ceb2-4faa-b6bf-329bf39fa1e4";
+        let u = Uuid::parse_str(uuid_str).unwrap();
+        serde_test::assert_ser_tokens(&u.hyphenated(), &[Token::Str(uuid_str)]);
+    }
+
+    #[test]
+    fn test_serialize_simple() {
+        let uuid_str = "f9168c5eceb24faab6bf329bf39fa1e4";
+        let u = Uuid::parse_str(uuid_str).unwrap();
+        serde_test::assert_ser_tokens(&u.simple(), &[Token::Str(uuid_str)]);
+    }
+
+    #[test]
+    fn test_serialize_urn() {
+        let uuid_str = "urn:uuid:f9168c5e-ceb2-4faa-b6bf-329bf39fa1e4";
+        let u = Uuid::parse_str(uuid_str).unwrap();
+        serde_test::assert_ser_tokens(&u.urn(), &[Token::Str(uuid_str)]);
+    }
+
+    #[test]
+    fn test_serialize_braced() {
+        let uuid_str = "{f9168c5e-ceb2-4faa-b6bf-329bf39fa1e4}";
+        let u = Uuid::parse_str(uuid_str).unwrap();
+        serde_test::assert_ser_tokens(&u.braced(), &[Token::Str(uuid_str)]);
+    }
+
+    #[test]
+    fn test_serialize_non_human_readable() {
+        let uuid_bytes = b"F9168C5E-CEB2-4F";
+        let u = Uuid::from_slice(uuid_bytes).unwrap();
+        serde_test::assert_tokens(
+            &u.compact(),
+            &[serde_test::Token::Bytes(&[
+                70, 57, 49, 54, 56, 67, 53, 69, 45, 67, 69, 66, 50, 45, 52, 70,
+            ])],
+        );
+    }
+
+    #[test]
+    fn test_de_failure() {
+        serde_test::assert_de_tokens_error::<Readable<Uuid>>(
+            &[Token::Str("hello_world")],
+            "UUID parsing failed: invalid character: expected an optional prefix of `urn:uuid:` followed by [0-9a-fA-F-], found `h` at 1",
+        );
+
+        serde_test::assert_de_tokens_error::<Compact<Uuid>>(
+            &[Token::Bytes(b"hello_world")],
+            "UUID parsing failed: invalid length: expected 16 bytes, found 11",
+        );
+    }
+}
diff --git a/third_party/rust/uuid/src/external/slog_support.rs b/third_party/rust/uuid/src/external/slog_support.rs
new file mode 100644
index 0000000000..2d6e817ba2
--- /dev/null
+++ b/third_party/rust/uuid/src/external/slog_support.rs
@@ -0,0 +1,37 @@
+// Copyright 2013-2014 The Rust Project Developers.
+// Copyright 2018 The Uuid Project Developers.
+//
+// See the COPYRIGHT file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use crate::Uuid;
+
+impl slog::Value for Uuid {
+    fn serialize(
+        &self,
+        _: &slog::Record<'_>,
+        key: slog::Key,
+        serializer: &mut dyn slog::Serializer,
+    ) -> Result<(), slog::Error> {
+        serializer.emit_arguments(key, &format_args!("{}", self))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::new;
+
+    use slog::{self, crit, Drain};
+
+    #[test]
+    fn test_slog_kv() {
+        let root = slog::Logger::root(slog::Discard.fuse(), slog::o!());
+        let u1 = new();
+        crit!(root, "test"; "u1" => u1);
+    }
+}
diff --git a/third_party/rust/uuid/src/fmt.rs b/third_party/rust/uuid/src/fmt.rs
new file mode 100644
index 0000000000..92b40422a3
--- /dev/null
+++ b/third_party/rust/uuid/src/fmt.rs
@@ -0,0 +1,1030 @@
+// Copyright 2013-2014 The Rust Project Developers.
+// Copyright 2018 The Uuid Project Developers.
+//
+// See the COPYRIGHT file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Adapters for alternative string formats.
+
+use crate::{
+    std::{borrow::Borrow, fmt, ptr, str},
+    Uuid, Variant,
+};
+
+impl std::fmt::Debug for Uuid {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::LowerHex::fmt(self, f)
+    }
+}
+
+impl fmt::Display for Uuid {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::LowerHex::fmt(self, f)
+    }
+}
+
+impl fmt::Display for Variant {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            Variant::NCS => write!(f, "NCS"),
+            Variant::RFC4122 => write!(f, "RFC4122"),
+            Variant::Microsoft => write!(f, "Microsoft"),
+            Variant::Future => write!(f, "Future"),
+        }
+    }
+}
+
+impl fmt::LowerHex for Uuid {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::LowerHex::fmt(self.as_hyphenated(), f)
+    }
+}
+
+impl fmt::UpperHex for Uuid {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::UpperHex::fmt(self.as_hyphenated(), f)
+    }
+}
+
+/// Format a [`Uuid`] as a hyphenated string, like
+/// `67e55044-10b1-426f-9247-bb680e5fe0c8`.
+#[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
+#[repr(transparent)]
+pub struct Hyphenated(Uuid);
+
+/// Format a [`Uuid`] as a simple string, like
+/// `67e5504410b1426f9247bb680e5fe0c8`.
+#[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
+#[repr(transparent)]
+pub struct Simple(Uuid);
+
+/// Format a [`Uuid`] as a URN string, like
+/// `urn:uuid:67e55044-10b1-426f-9247-bb680e5fe0c8`.
+#[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
+#[repr(transparent)]
+pub struct Urn(Uuid);
+
+/// Format a [`Uuid`] as a braced hyphenated string, like
+/// `{67e55044-10b1-426f-9247-bb680e5fe0c8}`.
+#[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
+#[repr(transparent)]
+pub struct Braced(Uuid);
+
+impl Uuid {
+    /// Get a [`Hyphenated`] formatter.
+    #[inline]
+    pub const fn hyphenated(self) -> Hyphenated {
+        Hyphenated(self)
+    }
+
+    /// Get a borrowed [`Hyphenated`] formatter.
+    #[inline]
+    pub fn as_hyphenated(&self) -> &Hyphenated {
+        // SAFETY: `Uuid` and `Hyphenated` have the same ABI
+        unsafe { &*(self as *const Uuid as *const Hyphenated) }
+    }
+
+    /// Get a [`Simple`] formatter.
+    #[inline]
+    pub const fn simple(self) -> Simple {
+        Simple(self)
+    }
+
+    /// Get a borrowed [`Simple`] formatter.
+    #[inline]
+    pub fn as_simple(&self) -> &Simple {
+        // SAFETY: `Uuid` and `Simple` have the same ABI
+        unsafe { &*(self as *const Uuid as *const Simple) }
+    }
+
+    /// Get a [`Urn`] formatter.
+    #[inline]
+    pub const fn urn(self) -> Urn {
+        Urn(self)
+    }
+
+    /// Get a borrowed [`Urn`] formatter.
+    #[inline]
+    pub fn as_urn(&self) -> &Urn {
+        // SAFETY: `Uuid` and `Urn` have the same ABI
+        unsafe { &*(self as *const Uuid as *const Urn) }
+    }
+
+    /// Get a [`Braced`] formatter.
+    #[inline]
+    pub const fn braced(self) -> Braced {
+        Braced(self)
+    }
+
+    /// Get a borrowed [`Braced`] formatter.
+    #[inline]
+    pub fn as_braced(&self) -> &Braced {
+        // SAFETY: `Uuid` and `Braced` have the same ABI
+        unsafe { &*(self as *const Uuid as *const Braced) }
+    }
+}
+
+const UPPER: [u8; 16] = [
+    b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9', b'A', b'B', b'C', b'D', b'E', b'F',
+];
+const LOWER: [u8; 16] = [
+    b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9', b'a', b'b', b'c', b'd', b'e', b'f',
+];
+
+#[inline]
+const fn format_simple(src: &[u8; 16], upper: bool) -> [u8; 32] {
+    let lut = if upper { &UPPER } else { &LOWER };
+    let mut dst = [0; 32];
+    let mut i = 0;
+    while i < 16 {
+        let x = src[i];
+        dst[i * 2] = lut[(x >> 4) as usize];
+        dst[i * 2 + 1] = lut[(x & 0x0f) as usize];
+        i += 1;
+    }
+    dst
+}
+
+#[inline]
+const fn format_hyphenated(src: &[u8; 16], upper: bool) -> [u8; 36] {
+    let lut = if upper { &UPPER } else { &LOWER };
+    let groups = [(0, 8), (9, 13), (14, 18), (19, 23), (24, 36)];
+    let mut dst = [0; 36];
+
+    let mut group_idx = 0;
+    let mut i = 0;
+    while group_idx < 5 {
+        let (start, end) = groups[group_idx];
+        let mut j = start;
+        while j < end {
+            let x = src[i];
+            i += 1;
+
+            dst[j] = lut[(x >> 4) as usize];
+            dst[j + 1] = lut[(x & 0x0f) as usize];
+            j += 2;
+        }
+        if group_idx < 4 {
+            dst[end] = b'-';
+        }
+        group_idx += 1;
+    }
+    dst
+}
+
+#[inline]
+fn encode_simple<'b>(src: &[u8; 16], buffer: &'b mut [u8], upper: bool) -> &'b mut str {
+    let buf = &mut buffer[..Simple::LENGTH];
+    let dst = buf.as_mut_ptr();
+
+    // SAFETY: `buf` is guaranteed to be at least `LEN` bytes
+    // SAFETY: The encoded buffer is ASCII encoded
+    unsafe {
+        ptr::write(dst.cast(), format_simple(src, upper));
+        str::from_utf8_unchecked_mut(buf)
+    }
+}
+
+#[inline]
+fn encode_hyphenated<'b>(src: &[u8; 16], buffer: &'b mut [u8], upper: bool) -> &'b mut str {
+    let buf = &mut buffer[..Hyphenated::LENGTH];
+    let dst = buf.as_mut_ptr();
+
+    // SAFETY: `buf` is guaranteed to be at least `LEN` bytes
+    // SAFETY: The encoded buffer is ASCII encoded
+    unsafe {
+        ptr::write(dst.cast(), format_hyphenated(src, upper));
+        str::from_utf8_unchecked_mut(buf)
+    }
+}
+
+#[inline]
+fn encode_braced<'b>(src: &[u8; 16], buffer: &'b mut [u8], upper: bool) -> &'b mut str {
+    let buf = &mut buffer[..Braced::LENGTH];
+    buf[0] = b'{';
+    buf[Braced::LENGTH - 1] = b'}';
+
+    // SAFETY: `buf` is guaranteed to be at least `LEN` bytes
+    // SAFETY: The encoded buffer is ASCII encoded
+    unsafe {
+        let dst = buf.as_mut_ptr().add(1);
+
+        ptr::write(dst.cast(), format_hyphenated(src, upper));
+        str::from_utf8_unchecked_mut(buf)
+    }
+}
+
+#[inline]
+fn encode_urn<'b>(src: &[u8; 16], buffer: &'b mut [u8], upper: bool) -> &'b mut str {
+    let buf = &mut buffer[..Urn::LENGTH];
+    buf[..9].copy_from_slice(b"urn:uuid:");
+
+    // SAFETY: `buf` is guaranteed to be at least `LEN` bytes
+    // SAFETY: The encoded buffer is ASCII encoded
+    unsafe {
+        let dst = buf.as_mut_ptr().add(9);
+
+        ptr::write(dst.cast(), format_hyphenated(src, upper));
+        str::from_utf8_unchecked_mut(buf)
+    }
+}
+
+impl Hyphenated {
+    /// The length of a hyphenated [`Uuid`] string.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    pub const LENGTH: usize = 36;
+
+    /// Creates a [`Hyphenated`] from a [`Uuid`].
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    /// [`Hyphenated`]: struct.Hyphenated.html
+    pub const fn from_uuid(uuid: Uuid) -> Self {
+        Hyphenated(uuid)
+    }
+
+    /// Writes the [`Uuid`] as a lower-case hyphenated string to
+    /// `buffer`, and returns the subslice of the buffer that contains the
+    /// encoded UUID.
+    ///
+    /// This is slightly more efficient than using the formatting
+    /// infrastructure as it avoids virtual calls, and may avoid
+    /// double buffering.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    ///
+    /// # Panics
+    ///
+    /// Panics if the buffer is not large enough: it must have length at least
+    /// [`LENGTH`]. [`Uuid::encode_buffer`] can be used to get a
+    /// sufficiently-large temporary buffer.
+    ///
+    /// [`LENGTH`]: #associatedconstant.LENGTH
+    /// [`Uuid::encode_buffer`]: ../struct.Uuid.html#method.encode_buffer
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// fn main() -> Result<(), uuid::Error> {
+    ///     let uuid = Uuid::parse_str("936DA01f9abd4d9d80c702af85c822a8")?;
+    ///
+    ///     // the encoded portion is returned
+    ///     assert_eq!(
+    ///         uuid.hyphenated()
+    ///             .encode_lower(&mut Uuid::encode_buffer()),
+    ///         "936da01f-9abd-4d9d-80c7-02af85c822a8"
+    ///     );
+    ///
+    ///     // the buffer is mutated directly, and trailing contents remains
+    ///     let mut buf = [b'!'; 40];
+    ///     uuid.hyphenated().encode_lower(&mut buf);
+    ///     assert_eq!(
+    ///         &buf as &[_],
+    ///         b"936da01f-9abd-4d9d-80c7-02af85c822a8!!!!" as &[_]
+    ///     );
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    /// */
+    #[inline]
+    pub fn encode_lower<'buf>(&self, buffer: &'buf mut [u8]) -> &'buf mut str {
+        encode_hyphenated(self.0.as_bytes(), buffer, false)
+    }
+
+    /// Writes the [`Uuid`] as an upper-case hyphenated string to
+    /// `buffer`, and returns the subslice of the buffer that contains the
+    /// encoded UUID.
+    ///
+    /// This is slightly more efficient than using the formatting
+    /// infrastructure as it avoids virtual calls, and may avoid
+    /// double buffering.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    ///
+    /// # Panics
+    ///
+    /// Panics if the buffer is not large enough: it must have length at least
+    /// [`LENGTH`]. [`Uuid::encode_buffer`] can be used to get a
+    /// sufficiently-large temporary buffer.
+    ///
+    /// [`LENGTH`]: #associatedconstant.LENGTH
+    /// [`Uuid::encode_buffer`]: ../struct.Uuid.html#method.encode_buffer
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// fn main() -> Result<(), uuid::Error> {
+    ///     let uuid = Uuid::parse_str("936da01f9abd4d9d80c702af85c822a8")?;
+    ///
+    ///     // the encoded portion is returned
+    ///     assert_eq!(
+    ///         uuid.hyphenated()
+    ///             .encode_upper(&mut Uuid::encode_buffer()),
+    ///         "936DA01F-9ABD-4D9D-80C7-02AF85C822A8"
+    ///     );
+    ///
+    ///     // the buffer is mutated directly, and trailing contents remains
+    ///     let mut buf = [b'!'; 40];
+    ///     uuid.hyphenated().encode_upper(&mut buf);
+    ///     assert_eq!(
+    ///         &buf as &[_],
+    ///         b"936DA01F-9ABD-4D9D-80C7-02AF85C822A8!!!!" as &[_]
+    ///     );
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    /// */
+    #[inline]
+    pub fn encode_upper<'buf>(&self, buffer: &'buf mut [u8]) -> &'buf mut str {
+        encode_hyphenated(self.0.as_bytes(), buffer, true)
+    }
+
+    /// Get a reference to the underlying [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// let hyphenated = Uuid::nil().hyphenated();
+    /// assert_eq!(*hyphenated.as_uuid(), Uuid::nil());
+    /// ```
+    pub const fn as_uuid(&self) -> &Uuid {
+        &self.0
+    }
+
+    /// Consumes the [`Hyphenated`], returning the underlying [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// let hyphenated = Uuid::nil().hyphenated();
+    /// assert_eq!(hyphenated.into_uuid(), Uuid::nil());
+    /// ```
+    pub const fn into_uuid(self) -> Uuid {
+        self.0
+    }
+}
+
+impl Braced {
+    /// The length of a braced [`Uuid`] string.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    pub const LENGTH: usize = 38;
+
+    /// Creates a [`Braced`] from a [`Uuid`].
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    /// [`Braced`]: struct.Braced.html
+    pub const fn from_uuid(uuid: Uuid) -> Self {
+        Braced(uuid)
+    }
+
+    /// Writes the [`Uuid`] as a lower-case hyphenated string surrounded by
+    /// braces to `buffer`, and returns the subslice of the buffer that contains
+    /// the encoded UUID.
+    ///
+    /// This is slightly more efficient than using the formatting
+    /// infrastructure as it avoids virtual calls, and may avoid
+    /// double buffering.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    ///
+    /// # Panics
+    ///
+    /// Panics if the buffer is not large enough: it must have length at least
+    /// [`LENGTH`]. [`Uuid::encode_buffer`] can be used to get a
+    /// sufficiently-large temporary buffer.
+    ///
+    /// [`LENGTH`]: #associatedconstant.LENGTH
+    /// [`Uuid::encode_buffer`]: ../struct.Uuid.html#method.encode_buffer
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// fn main() -> Result<(), uuid::Error> {
+    ///     let uuid = Uuid::parse_str("936DA01f9abd4d9d80c702af85c822a8")?;
+    ///
+    ///     // the encoded portion is returned
+    ///     assert_eq!(
+    ///         uuid.braced()
+    ///             .encode_lower(&mut Uuid::encode_buffer()),
+    ///         "{936da01f-9abd-4d9d-80c7-02af85c822a8}"
+    ///     );
+    ///
+    ///     // the buffer is mutated directly, and trailing contents remains
+    ///     let mut buf = [b'!'; 40];
+    ///     uuid.braced().encode_lower(&mut buf);
+    ///     assert_eq!(
+    ///         &buf as &[_],
+    ///         b"{936da01f-9abd-4d9d-80c7-02af85c822a8}!!" as &[_]
+    ///     );
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    /// */
+    #[inline]
+    pub fn encode_lower<'buf>(&self, buffer: &'buf mut [u8]) -> &'buf mut str {
+        encode_braced(self.0.as_bytes(), buffer, false)
+    }
+
+    /// Writes the [`Uuid`] as an upper-case hyphenated string surrounded by
+    /// braces to `buffer`, and returns the subslice of the buffer that contains
+    /// the encoded UUID.
+    ///
+    /// This is slightly more efficient than using the formatting
+    /// infrastructure as it avoids virtual calls, and may avoid
+    /// double buffering.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    ///
+    /// # Panics
+    ///
+    /// Panics if the buffer is not large enough: it must have length at least
+    /// [`LENGTH`]. [`Uuid::encode_buffer`] can be used to get a
+    /// sufficiently-large temporary buffer.
+    ///
+    /// [`LENGTH`]: #associatedconstant.LENGTH
+    /// [`Uuid::encode_buffer`]: ../struct.Uuid.html#method.encode_buffer
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// fn main() -> Result<(), uuid::Error> {
+    ///     let uuid = Uuid::parse_str("936da01f9abd4d9d80c702af85c822a8")?;
+    ///
+    ///     // the encoded portion is returned
+    ///     assert_eq!(
+    ///         uuid.braced()
+    ///             .encode_upper(&mut Uuid::encode_buffer()),
+    ///         "{936DA01F-9ABD-4D9D-80C7-02AF85C822A8}"
+    ///     );
+    ///
+    ///     // the buffer is mutated directly, and trailing contents remains
+    ///     let mut buf = [b'!'; 40];
+    ///     uuid.braced().encode_upper(&mut buf);
+    ///     assert_eq!(
+    ///         &buf as &[_],
+    ///         b"{936DA01F-9ABD-4D9D-80C7-02AF85C822A8}!!" as &[_]
+    ///     );
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    /// */
+    #[inline]
+    pub fn encode_upper<'buf>(&self, buffer: &'buf mut [u8]) -> &'buf mut str {
+        encode_braced(self.0.as_bytes(), buffer, true)
+    }
+
+    /// Get a reference to the underlying [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// let braced = Uuid::nil().braced();
+    /// assert_eq!(*braced.as_uuid(), Uuid::nil());
+    /// ```
+    pub const fn as_uuid(&self) -> &Uuid {
+        &self.0
+    }
+
+    /// Consumes the [`Braced`], returning the underlying [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// let braced = Uuid::nil().braced();
+    /// assert_eq!(braced.into_uuid(), Uuid::nil());
+    /// ```
+    pub const fn into_uuid(self) -> Uuid {
+        self.0
+    }
+}
+
+impl Simple {
+    /// The length of a simple [`Uuid`] string.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    pub const LENGTH: usize = 32;
+
+    /// Creates a [`Simple`] from a [`Uuid`].
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    /// [`Simple`]: struct.Simple.html
+    pub const fn from_uuid(uuid: Uuid) -> Self {
+        Simple(uuid)
+    }
+
+    /// Writes the [`Uuid`] as a lower-case simple string to `buffer`,
+    /// and returns the subslice of the buffer that contains the encoded UUID.
+    ///
+    /// This is slightly more efficient than using the formatting
+    /// infrastructure as it avoids virtual calls, and may avoid
+    /// double buffering.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    ///
+    /// # Panics
+    ///
+    /// Panics if the buffer is not large enough: it must have length at least
+    /// [`LENGTH`]. [`Uuid::encode_buffer`] can be used to get a
+    /// sufficiently-large temporary buffer.
+    ///
+    /// [`LENGTH`]: #associatedconstant.LENGTH
+    /// [`Uuid::encode_buffer`]: ../struct.Uuid.html#method.encode_buffer
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// fn main() -> Result<(), uuid::Error> {
+    ///     let uuid = Uuid::parse_str("936DA01f9abd4d9d80c702af85c822a8")?;
+    ///
+    ///     // the encoded portion is returned
+    ///     assert_eq!(
+    ///         uuid.simple().encode_lower(&mut Uuid::encode_buffer()),
+    ///         "936da01f9abd4d9d80c702af85c822a8"
+    ///     );
+    ///
+    ///     // the buffer is mutated directly, and trailing contents remains
+    ///     let mut buf = [b'!'; 36];
+    ///     assert_eq!(
+    ///         uuid.simple().encode_lower(&mut buf),
+    ///         "936da01f9abd4d9d80c702af85c822a8"
+    ///     );
+    ///     assert_eq!(
+    ///         &buf as &[_],
+    ///         b"936da01f9abd4d9d80c702af85c822a8!!!!" as &[_]
+    ///     );
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    /// */
+    #[inline]
+    pub fn encode_lower<'buf>(&self, buffer: &'buf mut [u8]) -> &'buf mut str {
+        encode_simple(self.0.as_bytes(), buffer, false)
+    }
+
+    /// Writes the [`Uuid`] as an upper-case simple string to `buffer`,
+    /// and returns the subslice of the buffer that contains the encoded UUID.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    ///
+    /// # Panics
+    ///
+    /// Panics if the buffer is not large enough: it must have length at least
+    /// [`LENGTH`]. [`Uuid::encode_buffer`] can be used to get a
+    /// sufficiently-large temporary buffer.
+    ///
+    /// [`LENGTH`]: #associatedconstant.LENGTH
+    /// [`Uuid::encode_buffer`]: ../struct.Uuid.html#method.encode_buffer
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// fn main() -> Result<(), uuid::Error> {
+    ///     let uuid = Uuid::parse_str("936da01f9abd4d9d80c702af85c822a8")?;
+    ///
+    ///     // the encoded portion is returned
+    ///     assert_eq!(
+    ///         uuid.simple().encode_upper(&mut Uuid::encode_buffer()),
+    ///         "936DA01F9ABD4D9D80C702AF85C822A8"
+    ///     );
+    ///
+    ///     // the buffer is mutated directly, and trailing contents remains
+    ///     let mut buf = [b'!'; 36];
+    ///     assert_eq!(
+    ///         uuid.simple().encode_upper(&mut buf),
+    ///         "936DA01F9ABD4D9D80C702AF85C822A8"
+    ///     );
+    ///     assert_eq!(
+    ///         &buf as &[_],
+    ///         b"936DA01F9ABD4D9D80C702AF85C822A8!!!!" as &[_]
+    ///     );
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    /// */
+    #[inline]
+    pub fn encode_upper<'buf>(&self, buffer: &'buf mut [u8]) -> &'buf mut str {
+        encode_simple(self.0.as_bytes(), buffer, true)
+    }
+
+    /// Get a reference to the underlying [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// let simple = Uuid::nil().simple();
+    /// assert_eq!(*simple.as_uuid(), Uuid::nil());
+    /// ```
+    pub const fn as_uuid(&self) -> &Uuid {
+        &self.0
+    }
+
+    /// Consumes the [`Simple`], returning the underlying [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// let simple = Uuid::nil().simple();
+    /// assert_eq!(simple.into_uuid(), Uuid::nil());
+    /// ```
+    pub const fn into_uuid(self) -> Uuid {
+        self.0
+    }
+}
+
+impl Urn {
+    /// The length of a URN [`Uuid`] string.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    pub const LENGTH: usize = 45;
+
+    /// Creates a [`Urn`] from a [`Uuid`].
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    /// [`Urn`]: struct.Urn.html
+    pub const fn from_uuid(uuid: Uuid) -> Self {
+        Urn(uuid)
+    }
+
+    /// Writes the [`Uuid`] as a lower-case URN string to
+    /// `buffer`, and returns the subslice of the buffer that contains the
+    /// encoded UUID.
+    ///
+    /// This is slightly more efficient than using the formatting
+    /// infrastructure as it avoids virtual calls, and may avoid
+    /// double buffering.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    ///
+    /// # Panics
+    ///
+    /// Panics if the buffer is not large enough: it must have length at least
+    /// [`LENGTH`]. [`Uuid::encode_buffer`] can be used to get a
+    /// sufficiently-large temporary buffer.
+    ///
+    /// [`LENGTH`]: #associatedconstant.LENGTH
+    /// [`Uuid::encode_buffer`]: ../struct.Uuid.html#method.encode_buffer
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// fn main() -> Result<(), uuid::Error> {
+    ///     let uuid = Uuid::parse_str("936DA01f9abd4d9d80c702af85c822a8")?;
+    ///
+    ///     // the encoded portion is returned
+    ///     assert_eq!(
+    ///         uuid.urn().encode_lower(&mut Uuid::encode_buffer()),
+    ///         "urn:uuid:936da01f-9abd-4d9d-80c7-02af85c822a8"
+    ///     );
+    ///
+    ///     // the buffer is mutated directly, and trailing contents remains
+    ///     let mut buf = [b'!'; 49];
+    ///     uuid.urn().encode_lower(&mut buf);
+    ///     assert_eq!(
+    ///         uuid.urn().encode_lower(&mut buf),
+    ///         "urn:uuid:936da01f-9abd-4d9d-80c7-02af85c822a8"
+    ///     );
+    ///     assert_eq!(
+    ///         &buf as &[_],
+    ///         b"urn:uuid:936da01f-9abd-4d9d-80c7-02af85c822a8!!!!" as &[_]
+    ///     );
+    ///     
+    ///     Ok(())
+    /// }
+    /// ```
+    /// */
+    #[inline]
+    pub fn encode_lower<'buf>(&self, buffer: &'buf mut [u8]) -> &'buf mut str {
+        encode_urn(self.0.as_bytes(), buffer, false)
+    }
+
+    /// Writes the [`Uuid`] as an upper-case URN string to
+    /// `buffer`, and returns the subslice of the buffer that contains the
+    /// encoded UUID.
+    ///
+    /// This is slightly more efficient than using the formatting
+    /// infrastructure as it avoids virtual calls, and may avoid
+    /// double buffering.
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    ///
+    /// # Panics
+    ///
+    /// Panics if the buffer is not large enough: it must have length at least
+    /// [`LENGTH`]. [`Uuid::encode_buffer`] can be used to get a
+    /// sufficiently-large temporary buffer.
+    ///
+    /// [`LENGTH`]: #associatedconstant.LENGTH
+    /// [`Uuid::encode_buffer`]: ../struct.Uuid.html#method.encode_buffer
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// fn main() -> Result<(), uuid::Error> {
+    ///     let uuid = Uuid::parse_str("936da01f9abd4d9d80c702af85c822a8")?;
+    ///
+    ///     // the encoded portion is returned
+    ///     assert_eq!(
+    ///         uuid.urn().encode_upper(&mut Uuid::encode_buffer()),
+    ///         "urn:uuid:936DA01F-9ABD-4D9D-80C7-02AF85C822A8"
+    ///     );
+    ///
+    ///     // the buffer is mutated directly, and trailing contents remains
+    ///     let mut buf = [b'!'; 49];
+    ///     assert_eq!(
+    ///         uuid.urn().encode_upper(&mut buf),
+    ///         "urn:uuid:936DA01F-9ABD-4D9D-80C7-02AF85C822A8"
+    ///     );
+    ///     assert_eq!(
+    ///         &buf as &[_],
+    ///         b"urn:uuid:936DA01F-9ABD-4D9D-80C7-02AF85C822A8!!!!" as &[_]
+    ///     );
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    /// */
+    #[inline]
+    pub fn encode_upper<'buf>(&self, buffer: &'buf mut [u8]) -> &'buf mut str {
+        encode_urn(self.0.as_bytes(), buffer, true)
+    }
+
+    /// Get a reference to the underlying [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// let urn = Uuid::nil().urn();
+    /// assert_eq!(*urn.as_uuid(), Uuid::nil());
+    /// ```
+    pub const fn as_uuid(&self) -> &Uuid {
+        &self.0
+    }
+
+    /// Consumes the [`Urn`], returning the underlying [`Uuid`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use uuid::Uuid;
+    ///
+    /// let urn = Uuid::nil().urn();
+    /// assert_eq!(urn.into_uuid(), Uuid::nil());
+    /// ```
+    pub const fn into_uuid(self) -> Uuid {
+        self.0
+    }
+}
+
+macro_rules! impl_fmt_traits {
+    ($($T:ident<$($a:lifetime),*>),+) => {$(
+        impl<$($a),*> fmt::Display for $T<$($a),*> {
+            #[inline]
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                fmt::LowerHex::fmt(self, f)
+            }
+        }
+
+        impl<$($a),*> fmt::LowerHex for $T<$($a),*> {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                f.write_str(self.encode_lower(&mut [0; Self::LENGTH]))
+            }
+        }
+
+        impl<$($a),*> fmt::UpperHex for $T<$($a),*> {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                f.write_str(self.encode_upper(&mut [0; Self::LENGTH]))
+            }
+        }
+
+        impl_fmt_from!($T<$($a),*>);
+    )+}
+}
+
+macro_rules! impl_fmt_from {
+    ($T:ident<>) => {
+        impl From<Uuid> for $T {
+            #[inline]
+            fn from(f: Uuid) -> Self {
+                $T(f)
+            }
+        }
+
+        impl From<$T> for Uuid {
+            #[inline]
+            fn from(f: $T) -> Self {
+                f.into_uuid()
+            }
+        }
+
+        impl AsRef<Uuid> for $T {
+            #[inline]
+            fn as_ref(&self) -> &Uuid {
+                &self.0
+            }
+        }
+
+        impl Borrow<Uuid> for $T {
+            #[inline]
+            fn borrow(&self) -> &Uuid {
+                &self.0
+            }
+        }
+    };
+    ($T:ident<$a:lifetime>) => {
+        impl<$a> From<&$a Uuid> for $T<$a> {
+            #[inline]
+            fn from(f: &$a Uuid) -> Self {
+                $T::from_uuid_ref(f)
+            }
+        }
+
+        impl<$a> From<$T<$a>> for &$a Uuid {
+            #[inline]
+            fn from(f: $T<$a>) -> &$a Uuid {
+                f.0
+            }
+        }
+
+        impl<$a> AsRef<Uuid> for $T<$a> {
+            #[inline]
+            fn as_ref(&self) -> &Uuid {
+                self.0
+            }
+        }
+
+        impl<$a> Borrow<Uuid> for $T<$a> {
+            #[inline]
+            fn borrow(&self) -> &Uuid {
+                self.0
+            }
+        }
+    };
+}
+
+impl_fmt_traits! {
+    Hyphenated<>,
+    Simple<>,
+    Urn<>,
+    Braced<>
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn hyphenated_trailing() {
+        let mut buf = [b'x'; 100];
+        let len = Uuid::nil().hyphenated().encode_lower(&mut buf).len();
+        assert_eq!(len, super::Hyphenated::LENGTH);
+        assert!(buf[len..].iter().all(|x| *x == b'x'));
+    }
+
+    #[test]
+    fn hyphenated_ref_trailing() {
+        let mut buf = [b'x'; 100];
+        let len = Uuid::nil().as_hyphenated().encode_lower(&mut buf).len();
+        assert_eq!(len, super::Hyphenated::LENGTH);
+        assert!(buf[len..].iter().all(|x| *x == b'x'));
+    }
+
+    #[test]
+    fn simple_trailing() {
+        let mut buf = [b'x'; 100];
+        let len = Uuid::nil().simple().encode_lower(&mut buf).len();
+        assert_eq!(len, super::Simple::LENGTH);
+        assert!(buf[len..].iter().all(|x| *x == b'x'));
+    }
+
+    #[test]
+    fn simple_ref_trailing() {
+        let mut buf = [b'x'; 100];
+        let len = Uuid::nil().as_simple().encode_lower(&mut buf).len();
+        assert_eq!(len, super::Simple::LENGTH);
+        assert!(buf[len..].iter().all(|x| *x == b'x'));
+    }
+
+    #[test]
+    fn urn_trailing() {
+        let mut buf = [b'x'; 100];
+        let len = Uuid::nil().urn().encode_lower(&mut buf).len();
+        assert_eq!(len, super::Urn::LENGTH);
+        assert!(buf[len..].iter().all(|x| *x == b'x'));
+    }
+
+    #[test]
+    fn urn_ref_trailing() {
+        let mut buf = [b'x'; 100];
+        let len = Uuid::nil().as_urn().encode_lower(&mut buf).len();
+        assert_eq!(len, super::Urn::LENGTH);
+        assert!(buf[len..].iter().all(|x| *x == b'x'));
+    }
+
+    #[test]
+    fn braced_trailing() {
+        let mut buf = [b'x'; 100];
+        let len = Uuid::nil().braced().encode_lower(&mut buf).len();
+        assert_eq!(len, super::Braced::LENGTH);
+        assert!(buf[len..].iter().all(|x| *x == b'x'));
+    }
+
+    #[test]
+    fn braced_ref_trailing() {
+        let mut buf = [b'x'; 100];
+        let len = Uuid::nil().as_braced().encode_lower(&mut buf).len();
+        assert_eq!(len, super::Braced::LENGTH);
+        assert!(buf[len..].iter().all(|x| *x == b'x'));
+    }
+
+    #[test]
+    #[should_panic]
+    fn hyphenated_too_small() {
+        Uuid::nil().hyphenated().encode_lower(&mut [0; 35]);
+    }
+
+    #[test]
+    #[should_panic]
+    fn simple_too_small() {
+        Uuid::nil().simple().encode_lower(&mut [0; 31]);
+    }
+
+    #[test]
+    #[should_panic]
+    fn urn_too_small() {
+        Uuid::nil().urn().encode_lower(&mut [0; 44]);
+    }
+
+    #[test]
+    #[should_panic]
+    fn braced_too_small() {
+        Uuid::nil().braced().encode_lower(&mut [0; 37]);
+    }
+
+    #[test]
+    fn hyphenated_to_inner() {
+        let hyphenated = Uuid::nil().hyphenated();
+        assert_eq!(Uuid::from(hyphenated), Uuid::nil());
+    }
+
+    #[test]
+    fn simple_to_inner() {
+        let simple = Uuid::nil().simple();
+        assert_eq!(Uuid::from(simple), Uuid::nil());
+    }
+
+    #[test]
+    fn urn_to_inner() {
+        let urn = Uuid::nil().urn();
+        assert_eq!(Uuid::from(urn), Uuid::nil());
+    }
+
+    #[test]
+    fn braced_to_inner() {
+        let braced = Uuid::nil().braced();
+        assert_eq!(Uuid::from(braced), Uuid::nil());
+    }
+}
diff --git a/third_party/rust/uuid/src/lib.rs b/third_party/rust/uuid/src/lib.rs
new file mode 100644
index 0000000000..05ebc2d02f
--- /dev/null
+++ b/third_party/rust/uuid/src/lib.rs
@@ -0,0 +1,1548 @@
+// Copyright 2013-2014 The Rust Project Developers.
+// Copyright 2018 The Uuid Project Developers.
+//
+// See the COPYRIGHT file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Generate and parse universally unique identifiers (UUIDs).
+//!
+//! Here's an example of a UUID:
+//!
+//! ```text
+//! 67e55044-10b1-426f-9247-bb680e5fe0c8
+//! ```
+//!
+//! A UUID is a unique 128-bit value, stored as 16 octets, and regularly
+//! formatted as a hex string in five groups. UUIDs are used to assign unique
+//! identifiers to entities without requiring a central allocating authority.
+//!
+//! They are particularly useful in distributed systems, though can be used in
+//! disparate areas, such as databases and network protocols.  Typically a UUID
+//! is displayed in a readable string form as a sequence of hexadecimal digits,
+//! separated into groups by hyphens.
+//!
+//! The uniqueness property is not strictly guaranteed, however for all
+//! practical purposes, it can be assumed that an unintentional collision would
+//! be extremely unlikely.
+//!
+//! UUIDs have a number of standardized encodings that are specified in [RFC4122](http://tools.ietf.org/html/rfc4122),
+//! with recent additions [in draft](https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04).
+//!
+//! # Getting started
+//!
+//! Add the following to your `Cargo.toml`:
+//!
+//! ```toml
+//! [dependencies.uuid]
+//! version = "1.3.0"
+//! features = [
+//!     "v4",                # Lets you generate random UUIDs
+//!     "fast-rng",          # Use a faster (but still sufficiently random) RNG
+//!     "macro-diagnostics", # Enable better diagnostics for compile-time UUIDs
+//! ]
+//! ```
+//!
+//! When you want a UUID, you can generate one:
+//!
+//! ```
+//! # fn main() {
+//! # #[cfg(feature = "v4")]
+//! # {
+//! use uuid::Uuid;
+//!
+//! let id = Uuid::new_v4();
+//! # }
+//! # }
+//! ```
+//!
+//! If you have a UUID value, you can use its string literal form inline:
+//!
+//! ```
+//! use uuid::{uuid, Uuid};
+//!
+//! const ID: Uuid = uuid!("67e55044-10b1-426f-9247-bb680e5fe0c8");
+//! ```
+//!
+//! # Working with different UUID versions
+//!
+//! This library supports all standardized methods for generating UUIDs through individual Cargo features.
+//!
+//! By default, this crate depends on nothing but the Rust standard library and can parse and format
+//! UUIDs, but cannot generate them. Depending on the kind of UUID you'd like to work with, there
+//! are Cargo features that enable generating them:
+//!
+//! * `v1` - Version 1 UUIDs using a timestamp and monotonic counter.
+//! * `v3` - Version 3 UUIDs based on the MD5 hash of some data.
+//! * `v4` - Version 4 UUIDs with random data.
+//! * `v5` - Version 5 UUIDs based on the SHA1 hash of some data.
+//!
+//! Versions that are in draft are also supported. See the _unstable features_ section for details.
+//!
+//! This library also includes a [`Builder`] type that can be used to help construct UUIDs of any
+//! version without any additional dependencies or features. It's a lower-level API than [`Uuid`]
+//! that can be used when you need control over implicit requirements on things like a source
+//! of randomness.
+//!
+//! ## Which UUID version should I use?
+//!
+//! If you just want to generate unique identifiers then consider version 4 (`v4`) UUIDs. If you want
+//! to use UUIDs as database keys or need to sort them then consider version 7 (`v7`) UUIDs.
+//! Other versions should generally be avoided unless there's an existing need for them.
+//!
+//! Some UUID versions supersede others. Prefer version 6 over version 1 and version 5 over version 3.
+//!
+//! # Other features
+//!
+//! Other crate features can also be useful beyond the version support:
+//!
+//! * `macro-diagnostics` - enhances the diagnostics of `uuid!` macro.
+//! * `serde` - adds the ability to serialize and deserialize a UUID using
+//!   `serde`.
+//! * `arbitrary` - adds an `Arbitrary` trait implementation to `Uuid` for
+//!   fuzzing.
+//! * `fast-rng` - uses a faster algorithm for generating random UUIDs.
+//!   This feature requires more dependencies to compile, but is just as suitable for
+//!   UUIDs as the default algorithm.
+//!
+//! # Unstable features
+//!
+//! Some features are unstable. They may be incomplete or depend on other
+//! unstable libraries. These include:
+//!
+//! * `v6` - Version 6 UUIDs using a timestamp and monotonic counter.
+//! * `v7` - Version 7 UUIDs using a Unix timestamp.
+//! * `v8` - Version 8 UUIDs using user-defined data.
+//! * `zerocopy` - adds support for zero-copy deserialization using the
+//!   `zerocopy` library.
+//!
+//! Unstable features may break between minor releases.
+//!
+//! To allow unstable features, you'll need to enable the Cargo feature as
+//! normal, but also pass an additional flag through your environment to opt-in
+//! to unstable `uuid` features:
+//!
+//! ```text
+//! RUSTFLAGS="--cfg uuid_unstable"
+//! ```
+//!
+//! # Building for other targets
+//!
+//! ## WebAssembly
+//!
+//! For WebAssembly, enable the `js` feature:
+//!
+//! ```toml
+//! [dependencies.uuid]
+//! version = "1.3.0"
+//! features = [
+//!     "v4",
+//!     "v7",
+//!     "js",
+//! ]
+//! ```
+//!
+//! ## Embedded
+//!
+//! For embedded targets without the standard library, you'll need to
+//! disable default features when building `uuid`:
+//!
+//! ```toml
+//! [dependencies.uuid]
+//! version = "1.3.0"
+//! default-features = false
+//! ```
+//!
+//! Some additional features are supported in no-std environments:
+//!
+//! * `v1`, `v3`, `v5`, `v6`, and `v8`.
+//! * `serde`.
+//!
+//! If you need to use `v4` or `v7` in a no-std environment, you'll need to
+//! follow [`getrandom`'s docs] on configuring a source of randomness
+//! on currently unsupported targets. Alternatively, you can produce
+//! random bytes yourself and then pass them to [`Builder::from_random_bytes`]
+//! without enabling the `v4` feature.
+//!
+//! # Examples
+//!
+//! Parse a UUID given in the simple format and print it as a URN:
+//!
+//! ```
+//! # use uuid::Uuid;
+//! # fn main() -> Result<(), uuid::Error> {
+//! let my_uuid = Uuid::parse_str("a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8")?;
+//!
+//! println!("{}", my_uuid.urn());
+//! # Ok(())
+//! # }
+//! ```
+//!
+//! Generate a random UUID and print it out in hexadecimal form:
+//!
+//! ```
+//! // Note that this requires the `v4` feature to be enabled.
+//! # use uuid::Uuid;
+//! # fn main() {
+//! # #[cfg(feature = "v4")] {
+//! let my_uuid = Uuid::new_v4();
+//!
+//! println!("{}", my_uuid);
+//! # }
+//! # }
+//! ```
+//!
+//! # References
+//!
+//! * [Wikipedia: Universally Unique Identifier](http://en.wikipedia.org/wiki/Universally_unique_identifier)
+//! * [RFC4122: A Universally Unique Identifier (UUID) URN Namespace](http://tools.ietf.org/html/rfc4122)
+//! * [Draft RFC: New UUID Formats, Version 4](https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04)
+//!
+//! [`wasm-bindgen`]: https://crates.io/crates/wasm-bindgen
+//! [`cargo-web`]: https://crates.io/crates/cargo-web
+//! [`getrandom`'s docs]: https://docs.rs/getrandom
+
+#![no_std]
+#![deny(missing_debug_implementations, missing_docs)]
+#![doc(
+    html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
+    html_favicon_url = "https://www.rust-lang.org/favicon.ico",
+    html_root_url = "https://docs.rs/uuid/1.3.0"
+)]
+
+#[cfg(any(feature = "std", test))]
+#[macro_use]
+extern crate std;
+
+#[cfg(all(not(feature = "std"), not(test)))]
+#[macro_use]
+extern crate core as std;
+
+#[cfg(all(uuid_unstable, feature = "zerocopy"))]
+use zerocopy::{AsBytes, FromBytes, Unaligned};
+
+mod builder;
+mod error;
+mod parser;
+
+pub mod fmt;
+pub mod timestamp;
+
+pub use timestamp::{context::NoContext, ClockSequence, Timestamp};
+
+#[cfg(any(feature = "v1", feature = "v6"))]
+pub use timestamp::context::Context;
+
+#[cfg(feature = "v1")]
+#[doc(hidden)]
+// Soft-deprecated (Rust doesn't support deprecating re-exports)
+// Use `Context` from the crate root instead
+pub mod v1;
+#[cfg(feature = "v3")]
+mod v3;
+#[cfg(feature = "v4")]
+mod v4;
+#[cfg(feature = "v5")]
+mod v5;
+#[cfg(all(uuid_unstable, feature = "v6"))]
+mod v6;
+#[cfg(all(uuid_unstable, feature = "v7"))]
+mod v7;
+#[cfg(all(uuid_unstable, feature = "v8"))]
+mod v8;
+
+#[cfg(feature = "md5")]
+mod md5;
+#[cfg(feature = "rng")]
+mod rng;
+#[cfg(feature = "sha1")]
+mod sha1;
+
+mod external;
+
+#[macro_use]
+mod macros;
+
+#[doc(hidden)]
+#[cfg(feature = "macro-diagnostics")]
+pub extern crate uuid_macro_internal;
+
+use crate::std::convert;
+
+pub use crate::{builder::Builder, error::Error};
+
+/// A 128-bit (16 byte) buffer containing the UUID.
+///
+/// # ABI
+///
+/// The `Bytes` type is always guaranteed to be have the same ABI as [`Uuid`].
+pub type Bytes = [u8; 16];
+
+/// The version of the UUID, denoting the generating algorithm.
+///
+/// # References
+///
+/// * [Version in RFC4122](https://datatracker.ietf.org/doc/html/rfc4122#section-4.1.3)
+#[derive(Clone, Copy, Debug, PartialEq)]
+#[non_exhaustive]
+#[repr(u8)]
+pub enum Version {
+    /// The "nil" (all zeros) UUID.
+    Nil = 0u8,
+    /// Version 1: Timestamp and node ID.
+    Mac = 1,
+    /// Version 2: DCE Security.
+    Dce = 2,
+    /// Version 3: MD5 hash.
+    Md5 = 3,
+    /// Version 4: Random.
+    Random = 4,
+    /// Version 5: SHA-1 hash.
+    Sha1 = 5,
+    /// Version 6: Sortable Timestamp and node ID.
+    #[cfg(uuid_unstable)]
+    SortMac = 6,
+    /// Version 7: Timestamp and random.
+    #[cfg(uuid_unstable)]
+    SortRand = 7,
+    /// Version 8: Custom.
+    #[cfg(uuid_unstable)]
+    Custom = 8,
+    /// The "max" (all ones) UUID.
+    #[cfg(uuid_unstable)]
+    Max = 0xff,
+}
+
+/// The reserved variants of UUIDs.
+///
+/// # References
+///
+/// * [Variant in RFC4122](http://tools.ietf.org/html/rfc4122#section-4.1.1)
+#[derive(Clone, Copy, Debug, PartialEq)]
+#[non_exhaustive]
+#[repr(u8)]
+pub enum Variant {
+    /// Reserved by the NCS for backward compatibility.
+    NCS = 0u8,
+    /// As described in the RFC4122 Specification (default).
+    RFC4122,
+    /// Reserved by Microsoft for backward compatibility.
+    Microsoft,
+    /// Reserved for future expansion.
+    Future,
+}
+
+/// A Universally Unique Identifier (UUID).
+///
+/// # Examples
+///
+/// Parse a UUID given in the simple format and print it as a urn:
+///
+/// ```
+/// # use uuid::Uuid;
+/// # fn main() -> Result<(), uuid::Error> {
+/// let my_uuid = Uuid::parse_str("a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8")?;
+///
+/// println!("{}", my_uuid.urn());
+/// # Ok(())
+/// # }
+/// ```
+///
+/// Create a new random (V4) UUID and print it out in hexadecimal form:
+///
+/// ```
+/// // Note that this requires the `v4` feature enabled in the uuid crate.
+/// # use uuid::Uuid;
+/// # fn main() {
+/// # #[cfg(feature = "v4")] {
+/// let my_uuid = Uuid::new_v4();
+///
+/// println!("{}", my_uuid);
+/// # }
+/// # }
+/// ```
+///
+/// # Formatting
+///
+/// A UUID can be formatted in one of a few ways:
+///
+/// * [`simple`](#method.simple): `a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8`.
+/// * [`hyphenated`](#method.hyphenated):
+///   `a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8`.
+/// * [`urn`](#method.urn): `urn:uuid:A1A2A3A4-B1B2-C1C2-D1D2-D3D4D5D6D7D8`.
+/// * [`braced`](#method.braced): `{a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8}`.
+///
+/// The default representation when formatting a UUID with `Display` is
+/// hyphenated:
+///
+/// ```
+/// # use uuid::Uuid;
+/// # fn main() -> Result<(), uuid::Error> {
+/// let my_uuid = Uuid::parse_str("a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8")?;
+///
+/// assert_eq!(
+///     "a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
+///     my_uuid.to_string(),
+/// );
+/// # Ok(())
+/// # }
+/// ```
+///
+/// Other formats can be specified using adapter methods on the UUID:
+///
+/// ```
+/// # use uuid::Uuid;
+/// # fn main() -> Result<(), uuid::Error> {
+/// let my_uuid = Uuid::parse_str("a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8")?;
+///
+/// assert_eq!(
+///     "urn:uuid:a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8",
+///     my_uuid.urn().to_string(),
+/// );
+/// # Ok(())
+/// # }
+/// ```
+///
+/// # Endianness
+///
+/// The specification for UUIDs encodes the integer fields that make up the
+/// value in big-endian order. This crate assumes integer inputs are already in
+/// the correct order by default, regardless of the endianness of the
+/// environment. Most methods that accept integers have a `_le` variant (such as
+/// `from_fields_le`) that assumes any integer values will need to have their
+/// bytes flipped, regardless of the endianness of the environment.
+///
+/// Most users won't need to worry about endianness unless they need to operate
+/// on individual fields (such as when converting between Microsoft GUIDs). The
+/// important things to remember are:
+///
+/// - The endianness is in terms of the fields of the UUID, not the environment.
+/// - The endianness is assumed to be big-endian when there's no `_le` suffix
+///   somewhere.
+/// - Byte-flipping in `_le` methods applies to each integer.
+/// - Endianness roundtrips, so if you create a UUID with `from_fields_le`
+///   you'll get the same values back out with `to_fields_le`.
+///
+/// # ABI
+///
+/// The `Uuid` type is always guaranteed to be have the same ABI as [`Bytes`].
+#[derive(Clone, Copy, Eq, Hash, Ord, PartialEq, PartialOrd)]
+#[cfg_attr(all(uuid_unstable, feature = "zerocopy"), derive(AsBytes, FromBytes, Unaligned))]
+#[repr(transparent)]
+pub struct Uuid(Bytes);
+
+impl Uuid {
+    /// UUID namespace for Domain Name System (DNS).
+    pub const NAMESPACE_DNS: Self = Uuid([
+        0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30,
+        0xc8,
+    ]);
+
+    /// UUID namespace for ISO Object Identifiers (OIDs).
+    pub const NAMESPACE_OID: Self = Uuid([
+        0x6b, 0xa7, 0xb8, 0x12, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30,
+        0xc8,
+    ]);
+
+    /// UUID namespace for Uniform Resource Locators (URLs).
+    pub const NAMESPACE_URL: Self = Uuid([
+        0x6b, 0xa7, 0xb8, 0x11, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30,
+        0xc8,
+    ]);
+
+    /// UUID namespace for X.500 Distinguished Names (DNs).
+    pub const NAMESPACE_X500: Self = Uuid([
+        0x6b, 0xa7, 0xb8, 0x14, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30,
+        0xc8,
+    ]);
+
+    /// Returns the variant of the UUID structure.
+    ///
+    /// This determines the interpretation of the structure of the UUID.
+    /// This method simply reads the value of the variant byte. It doesn't
+    /// validate the rest of the UUID as conforming to that variant.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Variant};
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let my_uuid = Uuid::parse_str("02f09a3f-1624-3b1d-8409-44eff7708208")?;
+    ///
+    /// assert_eq!(Variant::RFC4122, my_uuid.get_variant());
+    /// # Ok(())
+    /// # }
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Variant in RFC4122](http://tools.ietf.org/html/rfc4122#section-4.1.1)
+    pub const fn get_variant(&self) -> Variant {
+        match self.as_bytes()[8] {
+            x if x & 0x80 == 0x00 => Variant::NCS,
+            x if x & 0xc0 == 0x80 => Variant::RFC4122,
+            x if x & 0xe0 == 0xc0 => Variant::Microsoft,
+            x if x & 0xe0 == 0xe0 => Variant::Future,
+            // The above match arms are actually exhaustive
+            // We just return `Future` here because we can't
+            // use `unreachable!()` in a `const fn`
+            _ => Variant::Future,
+        }
+    }
+
+    /// Returns the version number of the UUID.
+    ///
+    /// This represents the algorithm used to generate the value.
+    /// This method is the future-proof alternative to [`Uuid::get_version`].
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let my_uuid = Uuid::parse_str("02f09a3f-1624-3b1d-8409-44eff7708208")?;
+    ///
+    /// assert_eq!(3, my_uuid.get_version_num());
+    /// # Ok(())
+    /// # }
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version in RFC4122](https://datatracker.ietf.org/doc/html/rfc4122#section-4.1.3)
+    pub const fn get_version_num(&self) -> usize {
+        (self.as_bytes()[6] >> 4) as usize
+    }
+
+    /// Returns the version of the UUID.
+    ///
+    /// This represents the algorithm used to generate the value.
+    /// If the version field doesn't contain a recognized version then `None`
+    /// is returned. If you're trying to read the version for a future extension
+    /// you can also use [`Uuid::get_version_num`] to unconditionally return a
+    /// number. Future extensions may start to return `Some` once they're
+    /// standardized and supported.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Version};
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let my_uuid = Uuid::parse_str("02f09a3f-1624-3b1d-8409-44eff7708208")?;
+    ///
+    /// assert_eq!(Some(Version::Md5), my_uuid.get_version());
+    /// # Ok(())
+    /// # }
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version in RFC4122](https://datatracker.ietf.org/doc/html/rfc4122#section-4.1.3)
+    pub const fn get_version(&self) -> Option<Version> {
+        match self.get_version_num() {
+            0 if self.is_nil() => Some(Version::Nil),
+            1 => Some(Version::Mac),
+            2 => Some(Version::Dce),
+            3 => Some(Version::Md5),
+            4 => Some(Version::Random),
+            5 => Some(Version::Sha1),
+            #[cfg(uuid_unstable)]
+            6 => Some(Version::SortMac),
+            #[cfg(uuid_unstable)]
+            7 => Some(Version::SortRand),
+            #[cfg(uuid_unstable)]
+            8 => Some(Version::Custom),
+            #[cfg(uuid_unstable)]
+            0xf => Some(Version::Max),
+            _ => None,
+        }
+    }
+
+    /// Returns the four field values of the UUID.
+    ///
+    /// These values can be passed to the [`Uuid::from_fields`] method to get
+    /// the original `Uuid` back.
+    ///
+    /// * The first field value represents the first group of (eight) hex
+    ///   digits, taken as a big-endian `u32` value.  For V1 UUIDs, this field
+    ///   represents the low 32 bits of the timestamp.
+    /// * The second field value represents the second group of (four) hex
+    ///   digits, taken as a big-endian `u16` value.  For V1 UUIDs, this field
+    ///   represents the middle 16 bits of the timestamp.
+    /// * The third field value represents the third group of (four) hex digits,
+    ///   taken as a big-endian `u16` value.  The 4 most significant bits give
+    ///   the UUID version, and for V1 UUIDs, the last 12 bits represent the
+    ///   high 12 bits of the timestamp.
+    /// * The last field value represents the last two groups of four and twelve
+    ///   hex digits, taken in order.  The first 1-3 bits of this indicate the
+    ///   UUID variant, and for V1 UUIDs, the next 13-15 bits indicate the clock
+    ///   sequence and the last 48 bits indicate the node ID.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let uuid = Uuid::nil();
+    ///
+    /// assert_eq!(uuid.as_fields(), (0, 0, 0, &[0u8; 8]));
+    ///
+    /// let uuid = Uuid::parse_str("a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8")?;
+    ///
+    /// assert_eq!(
+    ///     uuid.as_fields(),
+    ///     (
+    ///         0xa1a2a3a4,
+    ///         0xb1b2,
+    ///         0xc1c2,
+    ///         &[0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8],
+    ///     )
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn as_fields(&self) -> (u32, u16, u16, &[u8; 8]) {
+        let bytes = self.as_bytes();
+
+        let d1 = (bytes[0] as u32) << 24
+            | (bytes[1] as u32) << 16
+            | (bytes[2] as u32) << 8
+            | (bytes[3] as u32);
+
+        let d2 = (bytes[4] as u16) << 8 | (bytes[5] as u16);
+
+        let d3 = (bytes[6] as u16) << 8 | (bytes[7] as u16);
+
+        let d4: &[u8; 8] = convert::TryInto::try_into(&bytes[8..16]).unwrap();
+        (d1, d2, d3, d4)
+    }
+
+    /// Returns the four field values of the UUID in little-endian order.
+    ///
+    /// The bytes in the returned integer fields will be converted from
+    /// big-endian order. This is based on the endianness of the UUID,
+    /// rather than the target environment so bytes will be flipped on both
+    /// big and little endian machines.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use uuid::Uuid;
+    ///
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let uuid = Uuid::parse_str("a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8")?;
+    ///
+    /// assert_eq!(
+    ///     uuid.to_fields_le(),
+    ///     (
+    ///         0xa4a3a2a1,
+    ///         0xb2b1,
+    ///         0xc2c1,
+    ///         &[0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8],
+    ///     )
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub fn to_fields_le(&self) -> (u32, u16, u16, &[u8; 8]) {
+        let d1 = (self.as_bytes()[0] as u32)
+            | (self.as_bytes()[1] as u32) << 8
+            | (self.as_bytes()[2] as u32) << 16
+            | (self.as_bytes()[3] as u32) << 24;
+
+        let d2 = (self.as_bytes()[4] as u16) | (self.as_bytes()[5] as u16) << 8;
+
+        let d3 = (self.as_bytes()[6] as u16) | (self.as_bytes()[7] as u16) << 8;
+
+        let d4: &[u8; 8] = convert::TryInto::try_into(&self.as_bytes()[8..16]).unwrap();
+        (d1, d2, d3, d4)
+    }
+
+    /// Returns a 128bit value containing the value.
+    ///
+    /// The bytes in the UUID will be packed directly into a `u128`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let uuid = Uuid::parse_str("a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8")?;
+    ///
+    /// assert_eq!(
+    ///     uuid.as_u128(),
+    ///     0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8,
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub const fn as_u128(&self) -> u128 {
+        (self.as_bytes()[0] as u128) << 120
+            | (self.as_bytes()[1] as u128) << 112
+            | (self.as_bytes()[2] as u128) << 104
+            | (self.as_bytes()[3] as u128) << 96
+            | (self.as_bytes()[4] as u128) << 88
+            | (self.as_bytes()[5] as u128) << 80
+            | (self.as_bytes()[6] as u128) << 72
+            | (self.as_bytes()[7] as u128) << 64
+            | (self.as_bytes()[8] as u128) << 56
+            | (self.as_bytes()[9] as u128) << 48
+            | (self.as_bytes()[10] as u128) << 40
+            | (self.as_bytes()[11] as u128) << 32
+            | (self.as_bytes()[12] as u128) << 24
+            | (self.as_bytes()[13] as u128) << 16
+            | (self.as_bytes()[14] as u128) << 8
+            | (self.as_bytes()[15] as u128)
+    }
+
+    /// Returns a 128bit little-endian value containing the value.
+    ///
+    /// The bytes in the `u128` will be flipped to convert into big-endian
+    /// order. This is based on the endianness of the UUID, rather than the
+    /// target environment so bytes will be flipped on both big and little
+    /// endian machines.
+    ///
+    /// Note that this will produce a different result than
+    /// [`Uuid::to_fields_le`], because the entire UUID is reversed, rather
+    /// than reversing the individual fields in-place.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let uuid = Uuid::parse_str("a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8")?;
+    ///
+    /// assert_eq!(
+    ///     uuid.to_u128_le(),
+    ///     0xd8d7d6d5d4d3d2d1c2c1b2b1a4a3a2a1,
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub const fn to_u128_le(&self) -> u128 {
+        (self.as_bytes()[0] as u128)
+            | (self.as_bytes()[1] as u128) << 8
+            | (self.as_bytes()[2] as u128) << 16
+            | (self.as_bytes()[3] as u128) << 24
+            | (self.as_bytes()[4] as u128) << 32
+            | (self.as_bytes()[5] as u128) << 40
+            | (self.as_bytes()[6] as u128) << 48
+            | (self.as_bytes()[7] as u128) << 56
+            | (self.as_bytes()[8] as u128) << 64
+            | (self.as_bytes()[9] as u128) << 72
+            | (self.as_bytes()[10] as u128) << 80
+            | (self.as_bytes()[11] as u128) << 88
+            | (self.as_bytes()[12] as u128) << 96
+            | (self.as_bytes()[13] as u128) << 104
+            | (self.as_bytes()[14] as u128) << 112
+            | (self.as_bytes()[15] as u128) << 120
+    }
+
+    /// Returns two 64bit values containing the value.
+    ///
+    /// The bytes in the UUID will be split into two `u64`.
+    /// The first u64 represents the 64 most significant bits,
+    /// the second one represents the 64 least significant.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let uuid = Uuid::parse_str("a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8")?;
+    /// assert_eq!(
+    ///     uuid.as_u64_pair(),
+    ///     (0xa1a2a3a4b1b2c1c2, 0xd1d2d3d4d5d6d7d8),
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub const fn as_u64_pair(&self) -> (u64, u64) {
+        let value = self.as_u128();
+        ((value >> 64) as u64, value as u64)
+    }
+
+    /// Returns a slice of 16 octets containing the value.
+    ///
+    /// This method borrows the underlying byte value of the UUID.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let bytes1 = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    /// let uuid1 = Uuid::from_bytes_ref(&bytes1);
+    ///
+    /// let bytes2 = uuid1.as_bytes();
+    /// let uuid2 = Uuid::from_bytes_ref(bytes2);
+    ///
+    /// assert_eq!(uuid1, uuid2);
+    ///
+    /// assert!(std::ptr::eq(
+    ///     uuid2 as *const Uuid as *const u8,
+    ///     &bytes1 as *const [u8; 16] as *const u8,
+    /// ));
+    /// ```
+    pub const fn as_bytes(&self) -> &Bytes {
+        &self.0
+    }
+
+    /// Consumes self and returns the underlying byte value of the UUID.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let bytes = [
+    ///     0xa1, 0xa2, 0xa3, 0xa4,
+    ///     0xb1, 0xb2,
+    ///     0xc1, 0xc2,
+    ///     0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
+    /// ];
+    /// let uuid = Uuid::from_bytes(bytes);
+    /// assert_eq!(bytes, uuid.into_bytes());
+    /// ```
+    pub const fn into_bytes(self) -> Bytes {
+        self.0
+    }
+
+    /// Returns the bytes of the UUID in little-endian order.
+    ///
+    /// The bytes will be flipped to convert into little-endian order. This is
+    /// based on the endianness of the UUID, rather than the target environment
+    /// so bytes will be flipped on both big and little endian machines.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use uuid::Uuid;
+    ///
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let uuid = Uuid::parse_str("a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8")?;
+    ///
+    /// assert_eq!(
+    ///     uuid.to_bytes_le(),
+    ///     ([
+    ///         0xa4, 0xa3, 0xa2, 0xa1, 0xb2, 0xb1, 0xc2, 0xc1, 0xd1, 0xd2,
+    ///         0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8
+    ///     ])
+    /// );
+    /// # Ok(())
+    /// # }
+    /// ```
+    pub const fn to_bytes_le(&self) -> Bytes {
+        [
+            self.0[3], self.0[2], self.0[1], self.0[0], self.0[5], self.0[4], self.0[7], self.0[6],
+            self.0[8], self.0[9], self.0[10], self.0[11], self.0[12], self.0[13], self.0[14],
+            self.0[15],
+        ]
+    }
+
+    /// Tests if the UUID is nil (all zeros).
+    pub const fn is_nil(&self) -> bool {
+        self.as_u128() == u128::MIN
+    }
+
+    /// Tests if the UUID is max (all ones).
+    #[cfg(uuid_unstable)]
+    pub const fn is_max(&self) -> bool {
+        self.as_u128() == u128::MAX
+    }
+
+    /// A buffer that can be used for `encode_...` calls, that is
+    /// guaranteed to be long enough for any of the format adapters.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use uuid::Uuid;
+    /// let uuid = Uuid::nil();
+    ///
+    /// assert_eq!(
+    ///     uuid.simple().encode_lower(&mut Uuid::encode_buffer()),
+    ///     "00000000000000000000000000000000"
+    /// );
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated()
+    ///         .encode_lower(&mut Uuid::encode_buffer()),
+    ///     "00000000-0000-0000-0000-000000000000"
+    /// );
+    ///
+    /// assert_eq!(
+    ///     uuid.urn().encode_lower(&mut Uuid::encode_buffer()),
+    ///     "urn:uuid:00000000-0000-0000-0000-000000000000"
+    /// );
+    /// ```
+    pub const fn encode_buffer() -> [u8; fmt::Urn::LENGTH] {
+        [0; fmt::Urn::LENGTH]
+    }
+
+    /// If the UUID is the correct version (v1, v6, or v7) this will return
+    /// the timestamp and counter portion parsed from a V1 UUID.
+    ///
+    /// Returns `None` if the supplied UUID is not V1.
+    ///
+    /// The V1 timestamp format defined in RFC4122 specifies a 60-bit
+    /// integer representing the number of 100-nanosecond intervals
+    /// since 00:00:00.00, 15 Oct 1582.
+    ///
+    /// [`Timestamp`] offers several options for converting the raw RFC4122
+    /// value into more commonly-used formats, such as a unix timestamp.
+    ///
+    /// # Roundtripping
+    ///
+    /// This method is unlikely to roundtrip a timestamp in a UUID due to the way
+    /// UUIDs encode timestamps. The timestamp returned from this method will be truncated to
+    /// 100ns precision for version 1 and 6 UUIDs, and to millisecond precision for version 7 UUIDs.
+    ///
+    /// [`Timestamp`]: v1/struct.Timestamp.html
+    pub const fn get_timestamp(&self) -> Option<Timestamp> {
+        match self.get_version() {
+            Some(Version::Mac) => {
+                let (ticks, counter) = timestamp::decode_rfc4122_timestamp(self);
+
+                Some(Timestamp::from_rfc4122(ticks, counter))
+            }
+            #[cfg(uuid_unstable)]
+            Some(Version::SortMac) => {
+                let (ticks, counter) = timestamp::decode_sorted_rfc4122_timestamp(self);
+
+                Some(Timestamp::from_rfc4122(ticks, counter))
+            }
+            #[cfg(uuid_unstable)]
+            Some(Version::SortRand) => {
+                let millis = timestamp::decode_unix_timestamp_millis(self);
+
+                let seconds = millis / 1000;
+                let nanos = ((millis % 1000) * 1_000_000) as u32;
+
+                Some(Timestamp {
+                    seconds,
+                    nanos,
+                    #[cfg(any(feature = "v1", feature = "v6"))]
+                    counter: 0,
+                })
+            }
+            _ => None,
+        }
+    }
+}
+
+impl Default for Uuid {
+    #[inline]
+    fn default() -> Self {
+        Uuid::nil()
+    }
+}
+
+impl AsRef<[u8]> for Uuid {
+    #[inline]
+    fn as_ref(&self) -> &[u8] {
+        &self.0
+    }
+}
+
+#[cfg(feature = "serde")]
+pub mod serde {
+    //! Adapters for alternative `serde` formats.
+    //!
+    //! This module contains adapters you can use with [`#[serde(with)]`](https://serde.rs/field-attrs.html#with)
+    //! to change the way a [`Uuid`](../struct.Uuid.html) is serialized
+    //! and deserialized.
+
+    pub use crate::external::serde_support::compact;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use crate::std::string::{String, ToString};
+
+    #[cfg(target_arch = "wasm32")]
+    use wasm_bindgen_test::*;
+
+    macro_rules! check {
+        ($buf:ident, $format:expr, $target:expr, $len:expr, $cond:expr) => {
+            $buf.clear();
+            write!($buf, $format, $target).unwrap();
+            assert!($buf.len() == $len);
+            assert!($buf.chars().all($cond), "{}", $buf);
+        };
+    }
+
+    pub const fn new() -> Uuid {
+        Uuid::from_bytes([
+            0xF9, 0x16, 0x8C, 0x5E, 0xCE, 0xB2, 0x4F, 0xAA, 0xB6, 0xBF, 0x32, 0x9B, 0xF3, 0x9F,
+            0xA1, 0xE4,
+        ])
+    }
+
+    pub const fn new2() -> Uuid {
+        Uuid::from_bytes([
+            0xF9, 0x16, 0x8C, 0x5E, 0xCE, 0xB2, 0x4F, 0xAB, 0xB6, 0xBF, 0x32, 0x9B, 0xF3, 0x9F,
+            0xA1, 0xE4,
+        ])
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_uuid_compare() {
+        let uuid1 = new();
+        let uuid2 = new2();
+
+        assert_eq!(uuid1, uuid1);
+        assert_eq!(uuid2, uuid2);
+
+        assert_ne!(uuid1, uuid2);
+        assert_ne!(uuid2, uuid1);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_uuid_default() {
+        let default_uuid = Uuid::default();
+        let nil_uuid = Uuid::nil();
+
+        assert_eq!(default_uuid, nil_uuid);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_uuid_display() {
+        use crate::std::fmt::Write;
+
+        let uuid = new();
+        let s = uuid.to_string();
+        let mut buffer = String::new();
+
+        assert_eq!(s, uuid.hyphenated().to_string());
+
+        check!(buffer, "{}", uuid, 36, |c| c.is_lowercase()
+            || c.is_digit(10)
+            || c == '-');
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_uuid_lowerhex() {
+        use crate::std::fmt::Write;
+
+        let mut buffer = String::new();
+        let uuid = new();
+
+        check!(buffer, "{:x}", uuid, 36, |c| c.is_lowercase()
+            || c.is_digit(10)
+            || c == '-');
+    }
+
+    // noinspection RsAssertEqual
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_uuid_operator_eq() {
+        let uuid1 = new();
+        let uuid1_dup = uuid1.clone();
+        let uuid2 = new2();
+
+        assert!(uuid1 == uuid1);
+        assert!(uuid1 == uuid1_dup);
+        assert!(uuid1_dup == uuid1);
+
+        assert!(uuid1 != uuid2);
+        assert!(uuid2 != uuid1);
+        assert!(uuid1_dup != uuid2);
+        assert!(uuid2 != uuid1_dup);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_uuid_to_string() {
+        use crate::std::fmt::Write;
+
+        let uuid = new();
+        let s = uuid.to_string();
+        let mut buffer = String::new();
+
+        assert_eq!(s.len(), 36);
+
+        check!(buffer, "{}", s, 36, |c| c.is_lowercase()
+            || c.is_digit(10)
+            || c == '-');
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_non_conforming() {
+        let from_bytes =
+            Uuid::from_bytes([4, 54, 67, 12, 43, 2, 2, 76, 32, 50, 87, 5, 1, 33, 43, 87]);
+
+        assert_eq!(from_bytes.get_version(), None);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_nil() {
+        let nil = Uuid::nil();
+        let not_nil = new();
+
+        assert!(nil.is_nil());
+        assert!(!not_nil.is_nil());
+
+        assert_eq!(nil.get_version(), Some(Version::Nil));
+        assert_eq!(not_nil.get_version(), Some(Version::Random));
+
+        assert_eq!(nil, Builder::from_bytes([0; 16]).with_version(Version::Nil).into_uuid());
+    }
+
+    #[test]
+    #[cfg(uuid_unstable)]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_max() {
+        let max = Uuid::max();
+        let not_max = new();
+
+        assert!(max.is_max());
+        assert!(!not_max.is_max());
+
+        assert_eq!(max.get_version(), Some(Version::Max));
+        assert_eq!(not_max.get_version(), Some(Version::Random));
+
+        assert_eq!(max, Builder::from_bytes([0xff; 16]).with_version(Version::Max).into_uuid());
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_predefined_namespaces() {
+        assert_eq!(
+            Uuid::NAMESPACE_DNS.hyphenated().to_string(),
+            "6ba7b810-9dad-11d1-80b4-00c04fd430c8"
+        );
+        assert_eq!(
+            Uuid::NAMESPACE_URL.hyphenated().to_string(),
+            "6ba7b811-9dad-11d1-80b4-00c04fd430c8"
+        );
+        assert_eq!(
+            Uuid::NAMESPACE_OID.hyphenated().to_string(),
+            "6ba7b812-9dad-11d1-80b4-00c04fd430c8"
+        );
+        assert_eq!(
+            Uuid::NAMESPACE_X500.hyphenated().to_string(),
+            "6ba7b814-9dad-11d1-80b4-00c04fd430c8"
+        );
+    }
+
+    #[cfg(feature = "v3")]
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_get_version_v3() {
+        let uuid = Uuid::new_v3(&Uuid::NAMESPACE_DNS, "rust-lang.org".as_bytes());
+
+        assert_eq!(uuid.get_version().unwrap(), Version::Md5);
+        assert_eq!(uuid.get_version_num(), 3);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_get_variant() {
+        let uuid1 = new();
+        let uuid2 = Uuid::parse_str("550e8400-e29b-41d4-a716-446655440000").unwrap();
+        let uuid3 = Uuid::parse_str("67e55044-10b1-426f-9247-bb680e5fe0c8").unwrap();
+        let uuid4 = Uuid::parse_str("936DA01F9ABD4d9dC0C702AF85C822A8").unwrap();
+        let uuid5 = Uuid::parse_str("F9168C5E-CEB2-4faa-D6BF-329BF39FA1E4").unwrap();
+        let uuid6 = Uuid::parse_str("f81d4fae-7dec-11d0-7765-00a0c91e6bf6").unwrap();
+
+        assert_eq!(uuid1.get_variant(), Variant::RFC4122);
+        assert_eq!(uuid2.get_variant(), Variant::RFC4122);
+        assert_eq!(uuid3.get_variant(), Variant::RFC4122);
+        assert_eq!(uuid4.get_variant(), Variant::Microsoft);
+        assert_eq!(uuid5.get_variant(), Variant::Microsoft);
+        assert_eq!(uuid6.get_variant(), Variant::NCS);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_to_simple_string() {
+        let uuid1 = new();
+        let s = uuid1.simple().to_string();
+
+        assert_eq!(s.len(), 32);
+        assert!(s.chars().all(|c| c.is_digit(16)));
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_hyphenated_string() {
+        let uuid1 = new();
+        let s = uuid1.hyphenated().to_string();
+
+        assert_eq!(36, s.len());
+        assert!(s.chars().all(|c| c.is_digit(16) || c == '-'));
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_upper_lower_hex() {
+        use std::fmt::Write;
+
+        let mut buf = String::new();
+        let u = new();
+
+        macro_rules! check {
+            ($buf:ident, $format:expr, $target:expr, $len:expr, $cond:expr) => {
+                $buf.clear();
+                write!($buf, $format, $target).unwrap();
+                assert_eq!($len, buf.len());
+                assert!($buf.chars().all($cond), "{}", $buf);
+            };
+        }
+
+        check!(buf, "{:x}", u, 36, |c| c.is_lowercase()
+            || c.is_digit(10)
+            || c == '-');
+        check!(buf, "{:X}", u, 36, |c| c.is_uppercase()
+            || c.is_digit(10)
+            || c == '-');
+        check!(buf, "{:#x}", u, 36, |c| c.is_lowercase() || c.is_digit(10) || c == '-');
+        check!(buf, "{:#X}", u, 36, |c| c.is_uppercase() || c.is_digit(10) || c == '-');
+
+        check!(buf, "{:X}", u.hyphenated(), 36, |c| c.is_uppercase()
+            || c.is_digit(10)
+            || c == '-');
+        check!(buf, "{:X}", u.simple(), 32, |c| c.is_uppercase()
+            || c.is_digit(10));
+        check!(buf, "{:#X}", u.hyphenated(), 36, |c| c.is_uppercase()
+            || c.is_digit(10)
+            || c == '-');
+        check!(buf, "{:#X}", u.simple(), 32, |c| c.is_uppercase()
+            || c.is_digit(10));
+
+        check!(buf, "{:x}", u.hyphenated(), 36, |c| c.is_lowercase()
+            || c.is_digit(10)
+            || c == '-');
+        check!(buf, "{:x}", u.simple(), 32, |c| c.is_lowercase()
+            || c.is_digit(10));
+        check!(buf, "{:#x}", u.hyphenated(), 36, |c| c.is_lowercase()
+            || c.is_digit(10)
+            || c == '-');
+        check!(buf, "{:#x}", u.simple(), 32, |c| c.is_lowercase()
+            || c.is_digit(10));
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_to_urn_string() {
+        let uuid1 = new();
+        let ss = uuid1.urn().to_string();
+        let s = &ss[9..];
+
+        assert!(ss.starts_with("urn:uuid:"));
+        assert_eq!(s.len(), 36);
+        assert!(s.chars().all(|c| c.is_digit(16) || c == '-'));
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_to_simple_string_matching() {
+        let uuid1 = new();
+
+        let hs = uuid1.hyphenated().to_string();
+        let ss = uuid1.simple().to_string();
+
+        let hsn = hs.chars().filter(|&c| c != '-').collect::<String>();
+
+        assert_eq!(hsn, ss);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_string_roundtrip() {
+        let uuid = new();
+
+        let hs = uuid.hyphenated().to_string();
+        let uuid_hs = Uuid::parse_str(&hs).unwrap();
+        assert_eq!(uuid_hs, uuid);
+
+        let ss = uuid.to_string();
+        let uuid_ss = Uuid::parse_str(&ss).unwrap();
+        assert_eq!(uuid_ss, uuid);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_from_fields() {
+        let d1: u32 = 0xa1a2a3a4;
+        let d2: u16 = 0xb1b2;
+        let d3: u16 = 0xc1c2;
+        let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
+
+        let u = Uuid::from_fields(d1, d2, d3, &d4);
+
+        let expected = "a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8";
+        let result = u.simple().to_string();
+        assert_eq!(result, expected);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_from_fields_le() {
+        let d1: u32 = 0xa4a3a2a1;
+        let d2: u16 = 0xb2b1;
+        let d3: u16 = 0xc2c1;
+        let d4 = [0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
+
+        let u = Uuid::from_fields_le(d1, d2, d3, &d4);
+
+        let expected = "a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8";
+        let result = u.simple().to_string();
+        assert_eq!(result, expected);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_as_fields() {
+        let u = new();
+        let (d1, d2, d3, d4) = u.as_fields();
+
+        assert_ne!(d1, 0);
+        assert_ne!(d2, 0);
+        assert_ne!(d3, 0);
+        assert_eq!(d4.len(), 8);
+        assert!(!d4.iter().all(|&b| b == 0));
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_fields_roundtrip() {
+        let d1_in: u32 = 0xa1a2a3a4;
+        let d2_in: u16 = 0xb1b2;
+        let d3_in: u16 = 0xc1c2;
+        let d4_in = &[0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
+
+        let u = Uuid::from_fields(d1_in, d2_in, d3_in, d4_in);
+        let (d1_out, d2_out, d3_out, d4_out) = u.as_fields();
+
+        assert_eq!(d1_in, d1_out);
+        assert_eq!(d2_in, d2_out);
+        assert_eq!(d3_in, d3_out);
+        assert_eq!(d4_in, d4_out);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_fields_le_roundtrip() {
+        let d1_in: u32 = 0xa4a3a2a1;
+        let d2_in: u16 = 0xb2b1;
+        let d3_in: u16 = 0xc2c1;
+        let d4_in = &[0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
+
+        let u = Uuid::from_fields_le(d1_in, d2_in, d3_in, d4_in);
+        let (d1_out, d2_out, d3_out, d4_out) = u.to_fields_le();
+
+        assert_eq!(d1_in, d1_out);
+        assert_eq!(d2_in, d2_out);
+        assert_eq!(d3_in, d3_out);
+        assert_eq!(d4_in, d4_out);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_fields_le_are_actually_le() {
+        let d1_in: u32 = 0xa1a2a3a4;
+        let d2_in: u16 = 0xb1b2;
+        let d3_in: u16 = 0xc1c2;
+        let d4_in = &[0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8];
+
+        let u = Uuid::from_fields(d1_in, d2_in, d3_in, d4_in);
+        let (d1_out, d2_out, d3_out, d4_out) = u.to_fields_le();
+
+        assert_eq!(d1_in, d1_out.swap_bytes());
+        assert_eq!(d2_in, d2_out.swap_bytes());
+        assert_eq!(d3_in, d3_out.swap_bytes());
+        assert_eq!(d4_in, d4_out);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_from_u128() {
+        let v_in: u128 = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8;
+
+        let u = Uuid::from_u128(v_in);
+
+        let expected = "a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8";
+        let result = u.simple().to_string();
+        assert_eq!(result, expected);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_from_u128_le() {
+        let v_in: u128 = 0xd8d7d6d5d4d3d2d1c2c1b2b1a4a3a2a1;
+
+        let u = Uuid::from_u128_le(v_in);
+
+        let expected = "a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8";
+        let result = u.simple().to_string();
+        assert_eq!(result, expected);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_from_u64_pair() {
+        let high_in: u64 = 0xa1a2a3a4b1b2c1c2;
+        let low_in: u64 = 0xd1d2d3d4d5d6d7d8;
+
+        let u = Uuid::from_u64_pair(high_in, low_in);
+
+        let expected = "a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8";
+        let result = u.simple().to_string();
+        assert_eq!(result, expected);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_u128_roundtrip() {
+        let v_in: u128 = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8;
+
+        let u = Uuid::from_u128(v_in);
+        let v_out = u.as_u128();
+
+        assert_eq!(v_in, v_out);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_u128_le_roundtrip() {
+        let v_in: u128 = 0xd8d7d6d5d4d3d2d1c2c1b2b1a4a3a2a1;
+
+        let u = Uuid::from_u128_le(v_in);
+        let v_out = u.to_u128_le();
+
+        assert_eq!(v_in, v_out);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_u64_pair_roundtrip() {
+        let high_in: u64 = 0xa1a2a3a4b1b2c1c2;
+        let low_in: u64 = 0xd1d2d3d4d5d6d7d8;
+
+        let u = Uuid::from_u64_pair(high_in, low_in);
+        let (high_out, low_out) = u.as_u64_pair();
+
+        assert_eq!(high_in, high_out);
+        assert_eq!(low_in, low_out);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_u128_le_is_actually_le() {
+        let v_in: u128 = 0xa1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8;
+
+        let u = Uuid::from_u128(v_in);
+        let v_out = u.to_u128_le();
+
+        assert_eq!(v_in, v_out.swap_bytes());
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_from_slice() {
+        let b = [
+            0xa1, 0xa2, 0xa3, 0xa4, 0xb1, 0xb2, 0xc1, 0xc2, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6,
+            0xd7, 0xd8,
+        ];
+
+        let u = Uuid::from_slice(&b).unwrap();
+        let expected = "a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8";
+
+        assert_eq!(u.simple().to_string(), expected);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_from_bytes() {
+        let b = [
+            0xa1, 0xa2, 0xa3, 0xa4, 0xb1, 0xb2, 0xc1, 0xc2, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6,
+            0xd7, 0xd8,
+        ];
+
+        let u = Uuid::from_bytes(b);
+        let expected = "a1a2a3a4b1b2c1c2d1d2d3d4d5d6d7d8";
+
+        assert_eq!(u.simple().to_string(), expected);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_as_bytes() {
+        let u = new();
+        let ub = u.as_bytes();
+        let ur = u.as_ref();
+
+        assert_eq!(ub.len(), 16);
+        assert_eq!(ur.len(), 16);
+        assert!(!ub.iter().all(|&b| b == 0));
+        assert!(!ur.iter().all(|&b| b == 0));
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_bytes_roundtrip() {
+        let b_in: crate::Bytes = [
+            0xa1, 0xa2, 0xa3, 0xa4, 0xb1, 0xb2, 0xc1, 0xc2, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6,
+            0xd7, 0xd8,
+        ];
+
+        let u = Uuid::from_slice(&b_in).unwrap();
+
+        let b_out = u.as_bytes();
+
+        assert_eq!(&b_in, b_out);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_bytes_le_roundtrip() {
+        let b = [
+            0xa1, 0xa2, 0xa3, 0xa4, 0xb1, 0xb2, 0xc1, 0xc2, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6,
+            0xd7, 0xd8,
+        ];
+
+        let u1 = Uuid::from_bytes(b);
+
+        let b_le = u1.to_bytes_le();
+
+        let u2 = Uuid::from_bytes_le(b_le);
+
+        assert_eq!(u1, u2);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_iterbytes_impl_for_uuid() {
+        let mut set = std::collections::HashSet::new();
+        let id1 = new();
+        let id2 = new2();
+        set.insert(id1.clone());
+
+        assert!(set.contains(&id1));
+        assert!(!set.contains(&id2));
+    }
+}
diff --git a/third_party/rust/uuid/src/macros.rs b/third_party/rust/uuid/src/macros.rs
new file mode 100644
index 0000000000..281c5335f2
--- /dev/null
+++ b/third_party/rust/uuid/src/macros.rs
@@ -0,0 +1,99 @@
+macro_rules! define_uuid_macro {
+    {$(#[$doc:meta])*} => {
+        $(#[$doc])*
+        #[cfg(feature = "macro-diagnostics")]
+        #[macro_export]
+        macro_rules! uuid {
+            ($uuid:literal) => {{
+                $crate::Uuid::from_bytes($crate::uuid_macro_internal::parse_lit!($uuid))
+            }};
+        }
+
+        $(#[$doc])*
+        #[cfg(not(feature = "macro-diagnostics"))]
+        #[macro_export]
+        macro_rules! uuid {
+            ($uuid:literal) => {{
+                const OUTPUT: $crate::Uuid = match $crate::Uuid::try_parse($uuid) {
+                    Ok(u) => u,
+                    Err(_) => {
+                        // here triggers const_err
+                        // const_panic requires 1.57
+                        #[allow(unconditional_panic)]
+                        let _ = ["invalid uuid representation"][1];
+
+                        loop {} // -> never type
+                    }
+                };
+                OUTPUT
+            }};
+        }
+    }
+}
+
+define_uuid_macro! {
+/// Parse [`Uuid`][uuid::Uuid]s from string literals at compile time.
+///
+/// ## Usage
+///
+/// This macro transforms the string literal representation of a
+/// [`Uuid`][uuid::Uuid] into the bytes representation, raising a compilation
+/// error if it cannot properly be parsed.
+///
+/// ## Examples
+///
+/// Setting a global constant:
+///
+/// ```
+/// # use uuid::{uuid, Uuid};
+/// pub const SCHEMA_ATTR_CLASS: Uuid = uuid!("00000000-0000-0000-0000-ffff00000000");
+/// pub const SCHEMA_ATTR_UUID: Uuid = uuid!("00000000-0000-0000-0000-ffff00000001");
+/// pub const SCHEMA_ATTR_NAME: Uuid = uuid!("00000000-0000-0000-0000-ffff00000002");
+/// ```
+///
+/// Defining a local variable:
+///
+/// ```
+/// # use uuid::uuid;
+/// let uuid = uuid!("urn:uuid:F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4");
+/// ```
+///
+/// ## Compilation Failures
+///
+/// Invalid UUIDs are rejected:
+///
+/// ```compile_fail
+/// # use uuid::uuid;
+/// let uuid = uuid!("F9168C5E-ZEB2-4FAA-B6BF-329BF39FA1E4");
+/// ```
+///
+/// Enable the feature `macro-diagnostics` to see the error messages below.
+///
+/// Provides the following compilation error:
+///
+/// ```txt
+/// error: invalid character: expected an optional prefix of `urn:uuid:` followed by [0-9a-fA-F-], found Z at 9
+///     |
+///     |     let id = uuid!("F9168C5E-ZEB2-4FAA-B6BF-329BF39FA1E4");
+///     |                              ^
+/// ```
+///
+/// Tokens that aren't string literals are also rejected:
+///
+/// ```compile_fail
+/// # use uuid::uuid;
+/// let uuid_str: &str = "550e8400e29b41d4a716446655440000";
+/// let uuid = uuid!(uuid_str);
+/// ```
+///
+/// Provides the following compilation error:
+///
+/// ```txt
+/// error: expected string literal
+///   |
+///   |     let uuid = uuid!(uuid_str);
+///   |                      ^^^^^^^^
+/// ```
+///
+/// [uuid::Uuid]: https://docs.rs/uuid/*/uuid/struct.Uuid.html
+}
diff --git a/third_party/rust/uuid/src/md5.rs b/third_party/rust/uuid/src/md5.rs
new file mode 100644
index 0000000000..fce5d9b872
--- /dev/null
+++ b/third_party/rust/uuid/src/md5.rs
@@ -0,0 +1,14 @@
+#[cfg(feature = "v3")]
+pub(crate) fn hash(ns: &[u8], src: &[u8]) -> [u8; 16] {
+    use md_5::{Digest, Md5};
+
+    let mut hasher = Md5::new();
+
+    hasher.update(ns);
+    hasher.update(src);
+
+    let mut bytes = [0; 16];
+    bytes.copy_from_slice(&hasher.finalize()[..16]);
+
+    bytes
+}
diff --git a/third_party/rust/uuid/src/parser.rs b/third_party/rust/uuid/src/parser.rs
new file mode 100644
index 0000000000..bc5f82638d
--- /dev/null
+++ b/third_party/rust/uuid/src/parser.rs
@@ -0,0 +1,521 @@
+// Copyright 2013-2014 The Rust Project Developers.
+// Copyright 2018 The Uuid Project Developers.
+//
+// See the COPYRIGHT file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! [`Uuid`] parsing constructs and utilities.
+//!
+//! [`Uuid`]: ../struct.Uuid.html
+
+use crate::{
+    error::*,
+    std::{convert::TryFrom, str},
+    Uuid,
+};
+
+impl str::FromStr for Uuid {
+    type Err = Error;
+
+    fn from_str(uuid_str: &str) -> Result<Self, Self::Err> {
+        Uuid::parse_str(uuid_str)
+    }
+}
+
+impl TryFrom<&'_ str> for Uuid {
+    type Error = Error;
+
+    fn try_from(uuid_str: &'_ str) -> Result<Self, Self::Error> {
+        Uuid::parse_str(uuid_str)
+    }
+}
+
+impl Uuid {
+    /// Parses a `Uuid` from a string of hexadecimal digits with optional
+    /// hyphens.
+    ///
+    /// Any of the formats generated by this module (simple, hyphenated, urn,
+    /// Microsoft GUID) are supported by this parsing function.
+    ///
+    /// Prefer [`try_parse`] unless you need detailed user-facing diagnostics.
+    /// This method will be eventually deprecated in favor of `try_parse`.
+    ///
+    /// # Examples
+    ///
+    /// Parse a hyphenated UUID:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Version, Variant};
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let uuid = Uuid::parse_str("550e8400-e29b-41d4-a716-446655440000")?;
+    ///
+    /// assert_eq!(Some(Version::Random), uuid.get_version());
+    /// assert_eq!(Variant::RFC4122, uuid.get_variant());
+    /// # Ok(())
+    /// # }
+    /// ```
+    ///
+    /// [`try_parse`]: #method.try_parse
+    pub fn parse_str(input: &str) -> Result<Uuid, Error> {
+        try_parse(input.as_bytes())
+            .map(Uuid::from_bytes)
+            .map_err(InvalidUuid::into_err)
+    }
+
+    /// Parses a `Uuid` from a string of hexadecimal digits with optional
+    /// hyphens.
+    ///
+    /// This function is similar to [`parse_str`], in fact `parse_str` shares
+    /// the same underlying parser. The difference is that if `try_parse`
+    /// fails, it won't generate very useful error messages. The `parse_str`
+    /// function will eventually be deprecated in favor or `try_parse`.
+    ///
+    /// To parse a UUID from a byte stream instead of a UTF8 string, see
+    /// [`try_parse_ascii`].
+    ///
+    /// # Examples
+    ///
+    /// Parse a hyphenated UUID:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Version, Variant};
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let uuid = Uuid::try_parse("550e8400-e29b-41d4-a716-446655440000")?;
+    ///
+    /// assert_eq!(Some(Version::Random), uuid.get_version());
+    /// assert_eq!(Variant::RFC4122, uuid.get_variant());
+    /// # Ok(())
+    /// # }
+    /// ```
+    ///
+    /// [`parse_str`]: #method.parse_str
+    /// [`try_parse_ascii`]: #method.try_parse_ascii
+    pub const fn try_parse(input: &str) -> Result<Uuid, Error> {
+        Self::try_parse_ascii(input.as_bytes())
+    }
+
+    /// Parses a `Uuid` from a string of hexadecimal digits with optional
+    /// hyphens.
+    ///
+    /// The input is expected to be a string of ASCII characters. This method
+    /// can be more convenient than [`try_parse`] if the UUID is being
+    /// parsed from a byte stream instead of from a UTF8 string.
+    ///
+    /// # Examples
+    ///
+    /// Parse a hyphenated UUID:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Version, Variant};
+    /// # fn main() -> Result<(), uuid::Error> {
+    /// let uuid = Uuid::try_parse_ascii(b"550e8400-e29b-41d4-a716-446655440000")?;
+    ///
+    /// assert_eq!(Some(Version::Random), uuid.get_version());
+    /// assert_eq!(Variant::RFC4122, uuid.get_variant());
+    /// # Ok(())
+    /// # }
+    /// ```
+    ///
+    /// [`try_parse`]: #method.try_parse
+    pub const fn try_parse_ascii(input: &[u8]) -> Result<Uuid, Error> {
+        match try_parse(input) {
+            Ok(bytes) => Ok(Uuid::from_bytes(bytes)),
+            // If parsing fails then we don't know exactly what went wrong
+            // In this case, we just return a generic error
+            Err(_) => Err(Error(ErrorKind::Other)),
+        }
+    }
+}
+
+const fn try_parse(input: &[u8]) -> Result<[u8; 16], InvalidUuid> {
+    let result = match (input.len(), input) {
+        // Inputs of 32 bytes must be a non-hyphenated UUID
+        (32, s) => parse_simple(s),
+        // Hyphenated UUIDs may be wrapped in various ways:
+        // - `{UUID}` for braced UUIDs
+        // - `urn:uuid:UUID` for URNs
+        // - `UUID` for a regular hyphenated UUID
+        (36, s)
+        | (38, [b'{', s @ .., b'}'])
+        | (45, [b'u', b'r', b'n', b':', b'u', b'u', b'i', b'd', b':', s @ ..]) => {
+            parse_hyphenated(s)
+        }
+        // Any other shaped input is immediately invalid
+        _ => Err(()),
+    };
+
+    match result {
+        Ok(b) => Ok(b),
+        Err(()) => Err(InvalidUuid(input)),
+    }
+}
+
+#[inline]
+const fn parse_simple(s: &[u8]) -> Result<[u8; 16], ()> {
+    // This length check here removes all other bounds
+    // checks in this function
+    if s.len() != 32 {
+        return Err(());
+    }
+
+    let mut buf: [u8; 16] = [0; 16];
+    let mut i = 0;
+
+    while i < 16 {
+        // Convert a two-char hex value (like `A8`)
+        // into a byte (like `10101000`)
+        let h1 = HEX_TABLE[s[i * 2] as usize];
+        let h2 = HEX_TABLE[s[i * 2 + 1] as usize];
+
+        // We use `0xff` as a sentinel value to indicate
+        // an invalid hex character sequence (like the letter `G`)
+        if h1 | h2 == 0xff {
+            return Err(());
+        }
+
+        // The upper nibble needs to be shifted into position
+        // to produce the final byte value
+        buf[i] = SHL4_TABLE[h1 as usize] | h2;
+        i += 1;
+    }
+
+    Ok(buf)
+}
+
+#[inline]
+const fn parse_hyphenated(s: &[u8]) -> Result<[u8; 16], ()> {
+    // This length check here removes all other bounds
+    // checks in this function
+    if s.len() != 36 {
+        return Err(());
+    }
+
+    // We look at two hex-encoded values (4 chars) at a time because
+    // that's the size of the smallest group in a hyphenated UUID.
+    // The indexes we're interested in are:
+    //
+    // uuid     : 936da01f-9abd-4d9d-80c7-02af85c822a8
+    //            |   |   ||   ||   ||   ||   |   |
+    // hyphens  : |   |   8|  13|  18|  23|   |   |
+    // positions: 0   4    9   14   19   24  28  32
+
+    // First, ensure the hyphens appear in the right places
+    match [s[8], s[13], s[18], s[23]] {
+        [b'-', b'-', b'-', b'-'] => {}
+        _ => return Err(()),
+    }
+
+    let positions: [u8; 8] = [0, 4, 9, 14, 19, 24, 28, 32];
+    let mut buf: [u8; 16] = [0; 16];
+    let mut j = 0;
+
+    while j < 8 {
+        let i = positions[j];
+
+        // The decoding here is the same as the simple case
+        // We're just dealing with two values instead of one
+        let h1 = HEX_TABLE[s[i as usize] as usize];
+        let h2 = HEX_TABLE[s[(i + 1) as usize] as usize];
+        let h3 = HEX_TABLE[s[(i + 2) as usize] as usize];
+        let h4 = HEX_TABLE[s[(i + 3) as usize] as usize];
+
+        if h1 | h2 | h3 | h4 == 0xff {
+            return Err(());
+        }
+
+        buf[j * 2] = SHL4_TABLE[h1 as usize] | h2;
+        buf[j * 2 + 1] = SHL4_TABLE[h3 as usize] | h4;
+        j += 1;
+    }
+
+    Ok(buf)
+}
+
+const HEX_TABLE: &[u8; 256] = &{
+    let mut buf = [0; 256];
+    let mut i: u8 = 0;
+
+    loop {
+        buf[i as usize] = match i {
+            b'0'..=b'9' => i - b'0',
+            b'a'..=b'f' => i - b'a' + 10,
+            b'A'..=b'F' => i - b'A' + 10,
+            _ => 0xff,
+        };
+
+        if i == 255 {
+            break buf;
+        }
+
+        i += 1
+    }
+};
+
+const SHL4_TABLE: &[u8; 256] = &{
+    let mut buf = [0; 256];
+    let mut i: u8 = 0;
+
+    loop {
+        buf[i as usize] = i.wrapping_shl(4);
+
+        if i == 255 {
+            break buf;
+        }
+
+        i += 1;
+    }
+};
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{std::string::ToString, tests::new};
+
+    #[test]
+    fn test_parse_uuid_v4_valid() {
+        let from_hyphenated = Uuid::parse_str("67e55044-10b1-426f-9247-bb680e5fe0c8").unwrap();
+        let from_simple = Uuid::parse_str("67e5504410b1426f9247bb680e5fe0c8").unwrap();
+        let from_urn = Uuid::parse_str("urn:uuid:67e55044-10b1-426f-9247-bb680e5fe0c8").unwrap();
+        let from_guid = Uuid::parse_str("{67e55044-10b1-426f-9247-bb680e5fe0c8}").unwrap();
+
+        assert_eq!(from_hyphenated, from_simple);
+        assert_eq!(from_hyphenated, from_urn);
+        assert_eq!(from_hyphenated, from_guid);
+
+        assert!(Uuid::parse_str("00000000000000000000000000000000").is_ok());
+        assert!(Uuid::parse_str("67e55044-10b1-426f-9247-bb680e5fe0c8").is_ok());
+        assert!(Uuid::parse_str("F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4").is_ok());
+        assert!(Uuid::parse_str("67e5504410b1426f9247bb680e5fe0c8").is_ok());
+        assert!(Uuid::parse_str("01020304-1112-2122-3132-414243444546").is_ok());
+        assert!(Uuid::parse_str("urn:uuid:67e55044-10b1-426f-9247-bb680e5fe0c8").is_ok());
+        assert!(Uuid::parse_str("{6d93bade-bd9f-4e13-8914-9474e1e3567b}").is_ok());
+
+        // Nil
+        let nil = Uuid::nil();
+        assert_eq!(
+            Uuid::parse_str("00000000000000000000000000000000").unwrap(),
+            nil
+        );
+        assert_eq!(
+            Uuid::parse_str("00000000-0000-0000-0000-000000000000").unwrap(),
+            nil
+        );
+    }
+
+    #[test]
+    fn test_parse_uuid_v4_invalid() {
+        // Invalid
+        assert_eq!(
+            Uuid::parse_str(""),
+            Err(Error(ErrorKind::SimpleLength { len: 0 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("!"),
+            Err(Error(ErrorKind::Char {
+                character: '!',
+                index: 1,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB2-4faa-B6BF-329BF39FA1E45"),
+            Err(Error(ErrorKind::GroupLength {
+                group: 4,
+                len: 13,
+                index: 25,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB2-4faa-BBF-329BF39FA1E4"),
+            Err(Error(ErrorKind::GroupLength {
+                group: 3,
+                len: 3,
+                index: 20,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB2-4faa-BGBF-329BF39FA1E4"),
+            Err(Error(ErrorKind::Char {
+                character: 'G',
+                index: 21,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB2F4faaFB6BFF329BF39FA1E4"),
+            Err(Error(ErrorKind::GroupCount { count: 2 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB2-4faaFB6BFF329BF39FA1E4"),
+            Err(Error(ErrorKind::GroupCount { count: 3 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB2-4faa-B6BFF329BF39FA1E4"),
+            Err(Error(ErrorKind::GroupCount { count: 4 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB2-4faa"),
+            Err(Error(ErrorKind::GroupCount { count: 3 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB2-4faaXB6BFF329BF39FA1E4"),
+            Err(Error(ErrorKind::Char {
+                character: 'X',
+                index: 19,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("{F9168C5E-CEB2-4faa9B6BFF329BF39FA1E41"),
+            Err(Error(ErrorKind::Char {
+                character: '{',
+                index: 1,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("{F9168C5E-CEB2-4faa9B6BFF329BF39FA1E41}"),
+            Err(Error(ErrorKind::GroupCount { count: 3 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB-24fa-eB6BFF32-BF39FA1E4"),
+            Err(Error(ErrorKind::GroupLength {
+                group: 1,
+                len: 3,
+                index: 10,
+            }))
+        );
+
+        // // (group, found, expecting)
+        // //
+        assert_eq!(
+            Uuid::parse_str("01020304-1112-2122-3132-41424344"),
+            Err(Error(ErrorKind::GroupLength {
+                group: 4,
+                len: 8,
+                index: 25,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("67e5504410b1426f9247bb680e5fe0c"),
+            Err(Error(ErrorKind::SimpleLength { len: 31 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("67e5504410b1426f9247bb680e5fe0c88"),
+            Err(Error(ErrorKind::SimpleLength { len: 33 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("67e5504410b1426f9247bb680e5fe0cg8"),
+            Err(Error(ErrorKind::Char {
+                character: 'g',
+                index: 32,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("67e5504410b1426%9247bb680e5fe0c8"),
+            Err(Error(ErrorKind::Char {
+                character: '%',
+                index: 16,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("231231212212423424324323477343246663"),
+            Err(Error(ErrorKind::SimpleLength { len: 36 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("{00000000000000000000000000000000}"),
+            Err(Error(ErrorKind::GroupCount { count: 1 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("67e5504410b1426f9247bb680e5fe0c"),
+            Err(Error(ErrorKind::SimpleLength { len: 31 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("67e550X410b1426f9247bb680e5fe0cd"),
+            Err(Error(ErrorKind::Char {
+                character: 'X',
+                index: 7,
+            }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("67e550-4105b1426f9247bb680e5fe0c"),
+            Err(Error(ErrorKind::GroupCount { count: 2 }))
+        );
+
+        assert_eq!(
+            Uuid::parse_str("F9168C5E-CEB2-4faa-B6BF1-02BF39FA1E4"),
+            Err(Error(ErrorKind::GroupLength {
+                group: 3,
+                len: 5,
+                index: 20,
+            }))
+        );
+    }
+
+    #[test]
+    fn test_roundtrip_default() {
+        let uuid_orig = new();
+        let orig_str = uuid_orig.to_string();
+        let uuid_out = Uuid::parse_str(&orig_str).unwrap();
+        assert_eq!(uuid_orig, uuid_out);
+    }
+
+    #[test]
+    fn test_roundtrip_hyphenated() {
+        let uuid_orig = new();
+        let orig_str = uuid_orig.hyphenated().to_string();
+        let uuid_out = Uuid::parse_str(&orig_str).unwrap();
+        assert_eq!(uuid_orig, uuid_out);
+    }
+
+    #[test]
+    fn test_roundtrip_simple() {
+        let uuid_orig = new();
+        let orig_str = uuid_orig.simple().to_string();
+        let uuid_out = Uuid::parse_str(&orig_str).unwrap();
+        assert_eq!(uuid_orig, uuid_out);
+    }
+
+    #[test]
+    fn test_roundtrip_urn() {
+        let uuid_orig = new();
+        let orig_str = uuid_orig.urn().to_string();
+        let uuid_out = Uuid::parse_str(&orig_str).unwrap();
+        assert_eq!(uuid_orig, uuid_out);
+    }
+
+    #[test]
+    fn test_roundtrip_braced() {
+        let uuid_orig = new();
+        let orig_str = uuid_orig.braced().to_string();
+        let uuid_out = Uuid::parse_str(&orig_str).unwrap();
+        assert_eq!(uuid_orig, uuid_out);
+    }
+
+    #[test]
+    fn test_try_parse_ascii_non_utf8() {
+        assert!(Uuid::try_parse_ascii(b"67e55044-10b1-426f-9247-bb680e5\0e0c8").is_err());
+    }
+}
diff --git a/third_party/rust/uuid/src/rng.rs b/third_party/rust/uuid/src/rng.rs
new file mode 100644
index 0000000000..dcfbb8d665
--- /dev/null
+++ b/third_party/rust/uuid/src/rng.rs
@@ -0,0 +1,39 @@
+#[cfg(any(feature = "v4", feature = "v7"))]
+pub(crate) fn bytes() -> [u8; 16] {
+    #[cfg(not(feature = "fast-rng"))]
+    {
+        let mut bytes = [0u8; 16];
+
+        getrandom::getrandom(&mut bytes).unwrap_or_else(|err| {
+            // NB: getrandom::Error has no source; this is adequate display
+            panic!("could not retrieve random bytes for uuid: {}", err)
+        });
+
+        bytes
+    }
+
+    #[cfg(feature = "fast-rng")]
+    {
+        rand::random()
+    }
+}
+
+#[cfg(any(feature = "v1", feature = "v6"))]
+pub(crate) fn u16() -> u16 {
+    #[cfg(not(feature = "fast-rng"))]
+    {
+        let mut bytes = [0u8; 2];
+
+        getrandom::getrandom(&mut bytes).unwrap_or_else(|err| {
+            // NB: getrandom::Error has no source; this is adequate display
+            panic!("could not retrieve random bytes for uuid: {}", err)
+        });
+
+        ((bytes[0] as u16) << 8) | (bytes[1] as u16)
+    }
+
+    #[cfg(feature = "fast-rng")]
+    {
+        rand::random()
+    }
+}
diff --git a/third_party/rust/uuid/src/sha1.rs b/third_party/rust/uuid/src/sha1.rs
new file mode 100644
index 0000000000..14ca302f28
--- /dev/null
+++ b/third_party/rust/uuid/src/sha1.rs
@@ -0,0 +1,14 @@
+#[cfg(feature = "v5")]
+pub(crate) fn hash(ns: &[u8], src: &[u8]) -> [u8; 16] {
+    use sha1_smol::Sha1;
+
+    let mut hasher = Sha1::new();
+
+    hasher.update(ns);
+    hasher.update(src);
+
+    let mut bytes = [0; 16];
+    bytes.copy_from_slice(&hasher.digest().bytes()[..16]);
+
+    bytes
+}
diff --git a/third_party/rust/uuid/src/timestamp.rs b/third_party/rust/uuid/src/timestamp.rs
new file mode 100644
index 0000000000..2f95ac4e93
--- /dev/null
+++ b/third_party/rust/uuid/src/timestamp.rs
@@ -0,0 +1,409 @@
+//! Generating UUIDs from timestamps.
+//!
+//! Timestamps are used in a few UUID versions as a source of decentralized
+//! uniqueness (as in versions 1 and 6), and as a way to enable sorting (as
+//! in versions 6 and 7). Timestamps aren't encoded the same way by all UUID
+//! versions so this module provides a single [`Timestamp`] type that can
+//! convert between them.
+//!
+//! # Timestamp representations in UUIDs
+//!
+//! Versions 1 and 6 UUIDs use a bespoke timestamp that consists of the
+//! number of 100ns ticks since `1582-10-15 00:00:00`, along with
+//! a counter value to avoid duplicates.
+//!
+//! Version 7 UUIDs use a more standard timestamp that consists of the
+//! number of millisecond ticks since the Unix epoch (`1970-01-01 00:00:00`).
+//!
+//! # References
+//!
+//! * [Timestamp in RFC4122](https://www.rfc-editor.org/rfc/rfc4122#section-4.1.4)
+//! * [Timestamp in Draft RFC: New UUID Formats, Version 4](https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04#section-6.1)
+
+use crate::Uuid;
+
+/// The number of 100 nanosecond ticks between the RFC4122 epoch
+/// (`1582-10-15 00:00:00`) and the Unix epoch (`1970-01-01 00:00:00`).
+pub const UUID_TICKS_BETWEEN_EPOCHS: u64 = 0x01B2_1DD2_1381_4000;
+
+/// A timestamp that can be encoded into a UUID.
+///
+/// This type abstracts the specific encoding, so versions 1, 6, and 7
+/// UUIDs can both be supported through the same type, even
+/// though they have a different representation of a timestamp.
+///
+/// # References
+///
+/// * [Timestamp in RFC4122](https://www.rfc-editor.org/rfc/rfc4122#section-4.1.4)
+/// * [Timestamp in Draft RFC: New UUID Formats, Version 4](https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04#section-6.1)
+/// * [Clock Sequence in RFC4122](https://datatracker.ietf.org/doc/html/rfc4122#section-4.1.5)
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Timestamp {
+    pub(crate) seconds: u64,
+    pub(crate) nanos: u32,
+    #[cfg(any(feature = "v1", feature = "v6"))]
+    pub(crate) counter: u16,
+}
+
+impl Timestamp {
+    /// Get a timestamp representing the current system time.
+    ///
+    /// This method defers to the standard library's `SystemTime` type.
+    ///
+    /// # Panics
+    ///
+    /// This method will panic if calculating the elapsed time since the Unix epoch fails.
+    #[cfg(feature = "std")]
+    pub fn now(context: impl ClockSequence<Output = u16>) -> Self {
+        #[cfg(not(any(feature = "v1", feature = "v6")))]
+        {
+            let _ = context;
+        }
+
+        let (seconds, nanos) = now();
+
+        Timestamp {
+            seconds,
+            nanos,
+            #[cfg(any(feature = "v1", feature = "v6"))]
+            counter: context.generate_sequence(seconds, nanos),
+        }
+    }
+
+    /// Construct a `Timestamp` from an RFC4122 timestamp and counter, as used
+    /// in versions 1 and 6 UUIDs.
+    pub const fn from_rfc4122(ticks: u64, counter: u16) -> Self {
+        #[cfg(not(any(feature = "v1", feature = "v6")))]
+        {
+            let _ = counter;
+        }
+
+        let (seconds, nanos) = Self::rfc4122_to_unix(ticks);
+
+        Timestamp {
+            seconds,
+            nanos,
+            #[cfg(any(feature = "v1", feature = "v6"))]
+            counter,
+        }
+    }
+
+    /// Construct a `Timestamp` from a Unix timestamp, as used in version 7 UUIDs.
+    pub fn from_unix(context: impl ClockSequence<Output = u16>, seconds: u64, nanos: u32) -> Self {
+        #[cfg(not(any(feature = "v1", feature = "v6")))]
+        {
+            let _ = context;
+
+            Timestamp { seconds, nanos }
+        }
+        #[cfg(any(feature = "v1", feature = "v6"))]
+        {
+            let counter = context.generate_sequence(seconds, nanos);
+
+            Timestamp {
+                seconds,
+                nanos,
+                counter,
+            }
+        }
+    }
+
+    /// Get the value of the timestamp as an RFC4122 timestamp and counter,
+    /// as used in versions 1 and 6 UUIDs.
+    #[cfg(any(feature = "v1", feature = "v6"))]
+    pub const fn to_rfc4122(&self) -> (u64, u16) {
+        (
+            Self::unix_to_rfc4122_ticks(self.seconds, self.nanos),
+            self.counter,
+        )
+    }
+
+    /// Get the value of the timestamp as a Unix timestamp, as used in version 7 UUIDs.
+    pub const fn to_unix(&self) -> (u64, u32) {
+        (self.seconds, self.nanos)
+    }
+
+    #[cfg(any(feature = "v1", feature = "v6"))]
+    const fn unix_to_rfc4122_ticks(seconds: u64, nanos: u32) -> u64 {
+        let ticks = UUID_TICKS_BETWEEN_EPOCHS + seconds * 10_000_000 + nanos as u64 / 100;
+
+        ticks
+    }
+
+    const fn rfc4122_to_unix(ticks: u64) -> (u64, u32) {
+        (
+            (ticks - UUID_TICKS_BETWEEN_EPOCHS) / 10_000_000,
+            ((ticks - UUID_TICKS_BETWEEN_EPOCHS) % 10_000_000) as u32 * 100,
+        )
+    }
+
+    #[deprecated(note = "use `to_unix` instead")]
+    /// Get the number of fractional nanoseconds in the Unix timestamp.
+    ///
+    /// This method is deprecated and probably doesn't do what you're expecting it to.
+    /// It doesn't return the timestamp as nanoseconds since the Unix epoch, it returns
+    /// the fractional seconds of the timestamp.
+    pub const fn to_unix_nanos(&self) -> u32 {
+        // NOTE: This method never did what it said on the tin: instead of
+        // converting the timestamp into nanos it simply returned the nanoseconds
+        // part of the timestamp.
+        //
+        // We can't fix the behavior because the return type is too small to fit
+        // a useful value for nanoseconds since the epoch.
+        self.nanos
+    }
+}
+
+pub(crate) const fn encode_rfc4122_timestamp(ticks: u64, counter: u16, node_id: &[u8; 6]) -> Uuid {
+    let time_low = (ticks & 0xFFFF_FFFF) as u32;
+    let time_mid = ((ticks >> 32) & 0xFFFF) as u16;
+    let time_high_and_version = (((ticks >> 48) & 0x0FFF) as u16) | (1 << 12);
+
+    let mut d4 = [0; 8];
+
+    d4[0] = (((counter & 0x3F00) >> 8) as u8) | 0x80;
+    d4[1] = (counter & 0xFF) as u8;
+    d4[2] = node_id[0];
+    d4[3] = node_id[1];
+    d4[4] = node_id[2];
+    d4[5] = node_id[3];
+    d4[6] = node_id[4];
+    d4[7] = node_id[5];
+
+    Uuid::from_fields(time_low, time_mid, time_high_and_version, &d4)
+}
+
+pub(crate) const fn decode_rfc4122_timestamp(uuid: &Uuid) -> (u64, u16) {
+    let bytes = uuid.as_bytes();
+
+    let ticks: u64 = ((bytes[6] & 0x0F) as u64) << 56
+        | (bytes[7] as u64) << 48
+        | (bytes[4] as u64) << 40
+        | (bytes[5] as u64) << 32
+        | (bytes[0] as u64) << 24
+        | (bytes[1] as u64) << 16
+        | (bytes[2] as u64) << 8
+        | (bytes[3] as u64);
+
+    let counter: u16 = ((bytes[8] & 0x3F) as u16) << 8 | (bytes[9] as u16);
+
+    (ticks, counter)
+}
+
+#[cfg(uuid_unstable)]
+pub(crate) const fn encode_sorted_rfc4122_timestamp(
+    ticks: u64,
+    counter: u16,
+    node_id: &[u8; 6],
+) -> Uuid {
+    let time_high = ((ticks >> 28) & 0xFFFF_FFFF) as u32;
+    let time_mid = ((ticks >> 12) & 0xFFFF) as u16;
+    let time_low_and_version = ((ticks & 0x0FFF) as u16) | (0x6 << 12);
+
+    let mut d4 = [0; 8];
+
+    d4[0] = (((counter & 0x3F00) >> 8) as u8) | 0x80;
+    d4[1] = (counter & 0xFF) as u8;
+    d4[2] = node_id[0];
+    d4[3] = node_id[1];
+    d4[4] = node_id[2];
+    d4[5] = node_id[3];
+    d4[6] = node_id[4];
+    d4[7] = node_id[5];
+
+    Uuid::from_fields(time_high, time_mid, time_low_and_version, &d4)
+}
+
+#[cfg(uuid_unstable)]
+pub(crate) const fn decode_sorted_rfc4122_timestamp(uuid: &Uuid) -> (u64, u16) {
+    let bytes = uuid.as_bytes();
+
+    let ticks: u64 = ((bytes[0]) as u64) << 52
+        | (bytes[1] as u64) << 44
+        | (bytes[2] as u64) << 36
+        | (bytes[3] as u64) << 28
+        | (bytes[4] as u64) << 20
+        | (bytes[5] as u64) << 12
+        | ((bytes[6] & 0xF) as u64) << 8
+        | (bytes[7] as u64);
+
+    let counter: u16 = ((bytes[8] & 0x3F) as u16) << 8 | (bytes[9] as u16);
+
+    (ticks, counter)
+}
+
+#[cfg(uuid_unstable)]
+pub(crate) const fn encode_unix_timestamp_millis(millis: u64, random_bytes: &[u8; 10]) -> Uuid {
+    let millis_high = ((millis >> 16) & 0xFFFF_FFFF) as u32;
+    let millis_low = (millis & 0xFFFF) as u16;
+
+    let random_and_version =
+        (random_bytes[0] as u16 | ((random_bytes[1] as u16) << 8) & 0x0FFF) | (0x7 << 12);
+
+    let mut d4 = [0; 8];
+
+    d4[0] = (random_bytes[2] & 0x3F) | 0x80;
+    d4[1] = random_bytes[3];
+    d4[2] = random_bytes[4];
+    d4[3] = random_bytes[5];
+    d4[4] = random_bytes[6];
+    d4[5] = random_bytes[7];
+    d4[6] = random_bytes[8];
+    d4[7] = random_bytes[9];
+
+    Uuid::from_fields(millis_high, millis_low, random_and_version, &d4)
+}
+
+#[cfg(uuid_unstable)]
+pub(crate) const fn decode_unix_timestamp_millis(uuid: &Uuid) -> u64 {
+    let bytes = uuid.as_bytes();
+
+    let millis: u64 = (bytes[0] as u64) << 40
+        | (bytes[1] as u64) << 32
+        | (bytes[2] as u64) << 24
+        | (bytes[3] as u64) << 16
+        | (bytes[4] as u64) << 8
+        | (bytes[5] as u64);
+
+    millis
+}
+
+#[cfg(all(feature = "std", feature = "js", target_arch = "wasm32"))]
+fn now() -> (u64, u32) {
+    use wasm_bindgen::prelude::*;
+
+    #[wasm_bindgen]
+    extern "C" {
+        #[wasm_bindgen(js_namespace = Date)]
+        fn now() -> f64;
+    }
+
+    let now = now();
+
+    let secs = (now / 1_000.0) as u64;
+    let nanos = ((now % 1_000.0) * 1_000_000.0) as u32;
+
+    dbg!((secs, nanos))
+}
+
+#[cfg(all(feature = "std", any(not(feature = "js"), not(target_arch = "wasm32"))))]
+fn now() -> (u64, u32) {
+    let dur = std::time::SystemTime::UNIX_EPOCH
+        .elapsed()
+        .expect("Getting elapsed time since UNIX_EPOCH. If this fails, we've somehow violated causality");
+
+    (dur.as_secs(), dur.subsec_nanos())
+}
+
+/// A counter that can be used by version 1 and version 6 UUIDs to support
+/// the uniqueness of timestamps.
+///
+/// # References
+///
+/// * [Clock Sequence in RFC4122](https://datatracker.ietf.org/doc/html/rfc4122#section-4.1.5)
+pub trait ClockSequence {
+    /// The type of sequence returned by this counter.
+    type Output;
+
+    /// Get the next value in the sequence to feed into a timestamp.
+    ///
+    /// This method will be called each time a [`Timestamp`] is constructed.
+    fn generate_sequence(&self, seconds: u64, subsec_nanos: u32) -> Self::Output;
+}
+
+impl<'a, T: ClockSequence + ?Sized> ClockSequence for &'a T {
+    type Output = T::Output;
+    fn generate_sequence(&self, seconds: u64, subsec_nanos: u32) -> Self::Output {
+        (**self).generate_sequence(seconds, subsec_nanos)
+    }
+}
+
+/// Default implementations for the [`ClockSequence`] trait.
+pub mod context {
+    use super::ClockSequence;
+
+    #[cfg(any(feature = "v1", feature = "v6"))]
+    use atomic::{Atomic, Ordering};
+
+    /// An empty counter that will always return the value `0`.
+    ///
+    /// This type should be used when constructing timestamps for version 7 UUIDs,
+    /// since they don't need a counter for uniqueness.
+    #[derive(Debug, Clone, Copy, Default)]
+    pub struct NoContext;
+
+    impl ClockSequence for NoContext {
+        type Output = u16;
+
+        fn generate_sequence(&self, _seconds: u64, _nanos: u32) -> Self::Output {
+            0
+        }
+    }
+
+    #[cfg(all(any(feature = "v1", feature = "v6"), feature = "std", feature = "rng"))]
+    static CONTEXT: Context = Context {
+        count: Atomic::new(0),
+    };
+
+    #[cfg(all(any(feature = "v1", feature = "v6"), feature = "std", feature = "rng"))]
+    static CONTEXT_INITIALIZED: Atomic<bool> = Atomic::new(false);
+
+    #[cfg(all(any(feature = "v1", feature = "v6"), feature = "std", feature = "rng"))]
+    pub(crate) fn shared_context() -> &'static Context {
+        // If the context is in its initial state then assign it to a random value
+        // It doesn't matter if multiple threads observe `false` here and initialize the context
+        if CONTEXT_INITIALIZED
+            .compare_exchange(false, true, Ordering::Relaxed, Ordering::Relaxed)
+            .is_ok()
+        {
+            CONTEXT.count.store(crate::rng::u16(), Ordering::Release);
+        }
+
+        &CONTEXT
+    }
+
+    /// A thread-safe, wrapping counter that produces 14-bit numbers.
+    ///
+    /// This type should be used when constructing version 1 and version 6 UUIDs.
+    #[derive(Debug)]
+    #[cfg(any(feature = "v1", feature = "v6"))]
+    pub struct Context {
+        count: Atomic<u16>,
+    }
+
+    #[cfg(any(feature = "v1", feature = "v6"))]
+    impl Context {
+        /// Construct a new context that's initialized with the given value.
+        ///
+        /// The starting value should be a random number, so that UUIDs from
+        /// different systems with the same timestamps are less likely to collide.
+        /// When the `rng` feature is enabled, prefer the [`Context::new_random`] method.
+        pub const fn new(count: u16) -> Self {
+            Self {
+                count: Atomic::<u16>::new(count),
+            }
+        }
+
+        /// Construct a new context that's initialized with a random value.
+        #[cfg(feature = "rng")]
+        pub fn new_random() -> Self {
+            Self {
+                count: Atomic::<u16>::new(crate::rng::u16()),
+            }
+        }
+    }
+
+    #[cfg(any(feature = "v1", feature = "v6"))]
+    impl ClockSequence for Context {
+        type Output = u16;
+
+        fn generate_sequence(&self, _seconds: u64, _nanos: u32) -> Self::Output {
+            // RFC4122 reserves 2 bits of the clock sequence so the actual
+            // maximum value is smaller than `u16::MAX`. Since we unconditionally
+            // increment the clock sequence we want to wrap once it becomes larger
+            // than what we can represent in a "u14". Otherwise there'd be patches
+            // where the clock sequence doesn't change regardless of the timestamp
+            self.count.fetch_add(1, Ordering::AcqRel) % (u16::MAX >> 2)
+        }
+    }
+}
diff --git a/third_party/rust/uuid/src/v1.rs b/third_party/rust/uuid/src/v1.rs
new file mode 100644
index 0000000000..e19c8a3fba
--- /dev/null
+++ b/third_party/rust/uuid/src/v1.rs
@@ -0,0 +1,175 @@
+//! The implementation for Version 1 UUIDs.
+//!
+//! This module is soft-deprecated. Instead of using the `Context` type re-exported here,
+//! use the one from the crate root.
+
+use crate::{Builder, Uuid};
+
+#[deprecated(note = "use types from the crate root instead")]
+pub use crate::{timestamp::context::Context, Timestamp};
+
+impl Uuid {
+    /// Create a new version 1 UUID using the current system time and node ID.
+    ///
+    /// This method is only available if both the `std` and `rng` features are enabled.
+    ///
+    /// This method is a convenient alternative to [`Uuid::new_v1`] that uses the current system time
+    /// as the source timestamp.
+    ///
+    /// Note that usage of this method requires the `v1`, `std`, and `rng` features of this crate
+    /// to be enabled.
+    #[cfg(all(feature = "std", feature = "rng"))]
+    pub fn now_v1(node_id: &[u8; 6]) -> Self {
+        let ts = Timestamp::now(crate::timestamp::context::shared_context());
+
+        Self::new_v1(ts, node_id)
+    }
+
+    /// Create a new version 1 UUID using the given timestamp and node ID.
+    ///
+    /// Also see [`Uuid::now_v1`] for a convenient way to generate version 1
+    /// UUIDs using the current system time.
+    ///
+    /// When generating [`Timestamp`]s using a [`ClockSequence`], this function
+    /// is only guaranteed to produce unique values if the following conditions
+    /// hold:
+    ///
+    /// 1. The *node ID* is unique for this process,
+    /// 2. The *context* is shared across all threads which are generating version 1
+    ///    UUIDs,
+    /// 3. The [`ClockSequence`] implementation reliably returns unique
+    ///    clock sequences (this crate provides [`Context`] for this
+    ///    purpose. However you can create your own [`ClockSequence`]
+    ///    implementation, if [`Context`] does not meet your needs).
+    ///
+    /// Note that usage of this method requires the `v1` feature of this crate
+    /// to be enabled.
+    ///
+    /// # Examples
+    ///
+    /// A UUID can be created from a unix [`Timestamp`] with a
+    /// [`ClockSequence`]. RFC4122 requires the clock sequence
+    /// is seeded with a random value:
+    ///
+    /// ```
+    /// # use uuid::{Timestamp, Context};
+    /// # use uuid::Uuid;
+    /// # fn random_seed() -> u16 { 42 }
+    /// let context = Context::new(random_seed());
+    /// let ts = Timestamp::from_unix(&context, 1497624119, 1234);
+    ///
+    /// let uuid = Uuid::new_v1(ts, &[1, 2, 3, 4, 5, 6]);
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "f3b4958c-52a1-11e7-802a-010203040506"
+    /// );
+    /// ```
+    ///
+    /// The timestamp can also be created manually as per RFC4122:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Timestamp, Context, ClockSequence};
+    /// let context = Context::new(42);
+    /// let ts = Timestamp::from_rfc4122(14976234442241191232, context.generate_sequence(0, 0));
+    ///
+    /// let uuid = Uuid::new_v1(ts, &[1, 2, 3, 4, 5, 6]);
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "b2c1ad40-45e0-1fd6-802a-010203040506"
+    /// );
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version 1 UUIDs in RFC4122](https://www.rfc-editor.org/rfc/rfc4122#section-4.2)
+    ///
+    /// [`Timestamp`]: v1/struct.Timestamp.html
+    /// [`ClockSequence`]: v1/trait.ClockSequence.html
+    /// [`Context`]: v1/struct.Context.html
+    pub fn new_v1(ts: Timestamp, node_id: &[u8; 6]) -> Self {
+        let (ticks, counter) = ts.to_rfc4122();
+
+        Builder::from_rfc4122_timestamp(ticks, counter, node_id).into_uuid()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use crate::{std::string::ToString, Variant, Version};
+    #[cfg(target_arch = "wasm32")]
+    use wasm_bindgen_test::*;
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new() {
+        let time: u64 = 1_496_854_535;
+        let time_fraction: u32 = 812_946_000;
+        let node = [1, 2, 3, 4, 5, 6];
+        let context = Context::new(0);
+
+        let uuid = Uuid::new_v1(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        assert_eq!(uuid.get_version(), Some(Version::Mac));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+        assert_eq!(
+            uuid.hyphenated().to_string(),
+            "20616934-4ba2-11e7-8000-010203040506"
+        );
+
+        let ts = uuid.get_timestamp().unwrap().to_rfc4122();
+
+        assert_eq!(ts.0 - 0x01B2_1DD2_1381_4000, 14_968_545_358_129_460);
+
+        // Ensure parsing the same UUID produces the same timestamp
+        let parsed = Uuid::parse_str("20616934-4ba2-11e7-8000-010203040506").unwrap();
+
+        assert_eq!(
+            uuid.get_timestamp().unwrap(),
+            parsed.get_timestamp().unwrap()
+        );
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    #[cfg(all(feature = "std", feature = "rng"))]
+    fn test_now() {
+        let node = [1, 2, 3, 4, 5, 6];
+
+        let uuid = Uuid::now_v1(&node);
+
+        assert_eq!(uuid.get_version(), Some(Version::Mac));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new_context() {
+        let time: u64 = 1_496_854_535;
+        let time_fraction: u32 = 812_946_000;
+        let node = [1, 2, 3, 4, 5, 6];
+
+        // This context will wrap
+        let context = Context::new((u16::MAX >> 2) - 1);
+
+        let uuid1 = Uuid::new_v1(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        let time: u64 = 1_496_854_536;
+
+        let uuid2 = Uuid::new_v1(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        assert_eq!(uuid1.get_timestamp().unwrap().to_rfc4122().1, 16382);
+        assert_eq!(uuid2.get_timestamp().unwrap().to_rfc4122().1, 0);
+
+        let time = 1_496_854_535;
+
+        let uuid3 = Uuid::new_v1(Timestamp::from_unix(&context, time, time_fraction), &node);
+        let uuid4 = Uuid::new_v1(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        assert_eq!(uuid3.get_timestamp().unwrap().to_rfc4122().1, 1);
+        assert_eq!(uuid4.get_timestamp().unwrap().to_rfc4122().1, 2);
+    }
+}
diff --git a/third_party/rust/uuid/src/v3.rs b/third_party/rust/uuid/src/v3.rs
new file mode 100644
index 0000000000..cc7cb9ac39
--- /dev/null
+++ b/third_party/rust/uuid/src/v3.rs
@@ -0,0 +1,151 @@
+use crate::Uuid;
+
+impl Uuid {
+    /// Creates a UUID using a name from a namespace, based on the MD5
+    /// hash.
+    ///
+    /// A number of namespaces are available as constants in this crate:
+    ///
+    /// * [`NAMESPACE_DNS`]
+    /// * [`NAMESPACE_OID`]
+    /// * [`NAMESPACE_URL`]
+    /// * [`NAMESPACE_X500`]
+    ///
+    /// Note that usage of this method requires the `v3` feature of this crate
+    /// to be enabled.
+    ///
+    /// # Examples
+    ///
+    /// Generating a MD5 DNS UUID for `rust-lang.org`:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Version};
+    /// let uuid = Uuid::new_v3(&Uuid::NAMESPACE_DNS, b"rust-lang.org");
+    ///
+    /// assert_eq!(Some(Version::Md5), uuid.get_version());
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version 3 and 5 UUIDs in RFC4122](https://www.rfc-editor.org/rfc/rfc4122#section-4.3)
+    ///
+    /// [`NAMESPACE_DNS`]: #associatedconstant.NAMESPACE_DNS
+    /// [`NAMESPACE_OID`]: #associatedconstant.NAMESPACE_OID
+    /// [`NAMESPACE_URL`]: #associatedconstant.NAMESPACE_URL
+    /// [`NAMESPACE_X500`]: #associatedconstant.NAMESPACE_X500
+    pub fn new_v3(namespace: &Uuid, name: &[u8]) -> Uuid {
+        crate::Builder::from_md5_bytes(crate::md5::hash(namespace.as_bytes(), name)).into_uuid()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[cfg(target_arch = "wasm32")]
+    use wasm_bindgen_test::*;
+
+    use crate::{std::string::ToString, Variant, Version};
+
+    static FIXTURE: &'static [(&'static Uuid, &'static str, &'static str)] = &[
+        (
+            &Uuid::NAMESPACE_DNS,
+            "example.org",
+            "04738bdf-b25a-3829-a801-b21a1d25095b",
+        ),
+        (
+            &Uuid::NAMESPACE_DNS,
+            "rust-lang.org",
+            "c6db027c-615c-3b4d-959e-1a917747ca5a",
+        ),
+        (
+            &Uuid::NAMESPACE_DNS,
+            "42",
+            "5aab6e0c-b7d3-379c-92e3-2bfbb5572511",
+        ),
+        (
+            &Uuid::NAMESPACE_DNS,
+            "lorem ipsum",
+            "4f8772e9-b59c-3cc9-91a9-5c823df27281",
+        ),
+        (
+            &Uuid::NAMESPACE_URL,
+            "example.org",
+            "39682ca1-9168-3da2-a1bb-f4dbcde99bf9",
+        ),
+        (
+            &Uuid::NAMESPACE_URL,
+            "rust-lang.org",
+            "7ed45aaf-e75b-3130-8e33-ee4d9253b19f",
+        ),
+        (
+            &Uuid::NAMESPACE_URL,
+            "42",
+            "08998a0c-fcf4-34a9-b444-f2bfc15731dc",
+        ),
+        (
+            &Uuid::NAMESPACE_URL,
+            "lorem ipsum",
+            "e55ad2e6-fb89-34e8-b012-c5dde3cd67f0",
+        ),
+        (
+            &Uuid::NAMESPACE_OID,
+            "example.org",
+            "f14eec63-2812-3110-ad06-1625e5a4a5b2",
+        ),
+        (
+            &Uuid::NAMESPACE_OID,
+            "rust-lang.org",
+            "6506a0ec-4d79-3e18-8c2b-f2b6b34f2b6d",
+        ),
+        (
+            &Uuid::NAMESPACE_OID,
+            "42",
+            "ce6925a5-2cd7-327b-ab1c-4b375ac044e4",
+        ),
+        (
+            &Uuid::NAMESPACE_OID,
+            "lorem ipsum",
+            "5dd8654f-76ba-3d47-bc2e-4d6d3a78cb09",
+        ),
+        (
+            &Uuid::NAMESPACE_X500,
+            "example.org",
+            "64606f3f-bd63-363e-b946-fca13611b6f7",
+        ),
+        (
+            &Uuid::NAMESPACE_X500,
+            "rust-lang.org",
+            "bcee7a9c-52f1-30c6-a3cc-8c72ba634990",
+        ),
+        (
+            &Uuid::NAMESPACE_X500,
+            "42",
+            "c1073fa2-d4a6-3104-b21d-7a6bdcf39a23",
+        ),
+        (
+            &Uuid::NAMESPACE_X500,
+            "lorem ipsum",
+            "02f09a3f-1624-3b1d-8409-44eff7708208",
+        ),
+    ];
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new() {
+        for &(ref ns, ref name, _) in FIXTURE {
+            let uuid = Uuid::new_v3(*ns, name.as_bytes());
+            assert_eq!(uuid.get_version(), Some(Version::Md5));
+            assert_eq!(uuid.get_variant(), Variant::RFC4122);
+        }
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_hyphenated_string() {
+        for &(ref ns, ref name, ref expected) in FIXTURE {
+            let uuid = Uuid::new_v3(*ns, name.as_bytes());
+            assert_eq!(uuid.hyphenated().to_string(), *expected);
+        }
+    }
+}
diff --git a/third_party/rust/uuid/src/v4.rs b/third_party/rust/uuid/src/v4.rs
new file mode 100644
index 0000000000..e78fb1e69a
--- /dev/null
+++ b/third_party/rust/uuid/src/v4.rs
@@ -0,0 +1,63 @@
+use crate::Uuid;
+
+impl Uuid {
+    /// Creates a random UUID.
+    ///
+    /// This uses the [`getrandom`] crate to utilise the operating system's RNG
+    /// as the source of random numbers. If you'd like to use a custom
+    /// generator, don't use this method: generate random bytes using your
+    /// custom generator and pass them to the
+    /// [`uuid::Builder::from_random_bytes`][from_random_bytes] function
+    /// instead.
+    ///
+    /// Note that usage of this method requires the `v4` feature of this crate
+    /// to be enabled.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Version};
+    /// let uuid = Uuid::new_v4();
+    ///
+    /// assert_eq!(Some(Version::Random), uuid.get_version());
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version 4 UUIDs in RFC4122](https://www.rfc-editor.org/rfc/rfc4122#section-4.4)
+    ///
+    /// [`getrandom`]: https://crates.io/crates/getrandom
+    /// [from_random_bytes]: struct.Builder.html#method.from_random_bytes
+    pub fn new_v4() -> Uuid {
+        crate::Builder::from_random_bytes(crate::rng::bytes()).into_uuid()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{Variant, Version};
+
+    #[cfg(target_arch = "wasm32")]
+    use wasm_bindgen_test::*;
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new() {
+        let uuid = Uuid::new_v4();
+
+        assert_eq!(uuid.get_version(), Some(Version::Random));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_get_version() {
+        let uuid = Uuid::new_v4();
+
+        assert_eq!(uuid.get_version(), Some(Version::Random));
+        assert_eq!(uuid.get_version_num(), 4)
+    }
+}
diff --git a/third_party/rust/uuid/src/v5.rs b/third_party/rust/uuid/src/v5.rs
new file mode 100644
index 0000000000..c3dd44795d
--- /dev/null
+++ b/third_party/rust/uuid/src/v5.rs
@@ -0,0 +1,162 @@
+use crate::Uuid;
+
+impl Uuid {
+    /// Creates a UUID using a name from a namespace, based on the SHA-1 hash.
+    ///
+    /// A number of namespaces are available as constants in this crate:
+    ///
+    /// * [`NAMESPACE_DNS`]
+    /// * [`NAMESPACE_OID`]
+    /// * [`NAMESPACE_URL`]
+    /// * [`NAMESPACE_X500`]
+    ///
+    /// Note that usage of this method requires the `v5` feature of this crate
+    /// to be enabled.
+    ///
+    /// # Examples
+    ///
+    /// Generating a SHA1 DNS UUID for `rust-lang.org`:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Version};
+    /// let uuid = Uuid::new_v5(&Uuid::NAMESPACE_DNS, b"rust-lang.org");
+    ///
+    /// assert_eq!(Some(Version::Sha1), uuid.get_version());
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version 3 and 5 UUIDs in RFC4122](https://www.rfc-editor.org/rfc/rfc4122#section-4.3)
+    ///
+    /// [`NAMESPACE_DNS`]: struct.Uuid.html#associatedconst.NAMESPACE_DNS
+    /// [`NAMESPACE_OID`]: struct.Uuid.html#associatedconst.NAMESPACE_OID
+    /// [`NAMESPACE_URL`]: struct.Uuid.html#associatedconst.NAMESPACE_URL
+    /// [`NAMESPACE_X500`]: struct.Uuid.html#associatedconst.NAMESPACE_X500
+    pub fn new_v5(namespace: &Uuid, name: &[u8]) -> Uuid {
+        crate::Builder::from_sha1_bytes(crate::sha1::hash(namespace.as_bytes(), name)).into_uuid()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[cfg(target_arch = "wasm32")]
+    use wasm_bindgen_test::*;
+
+    use crate::{std::string::ToString, Variant, Version};
+
+    static FIXTURE: &'static [(&'static Uuid, &'static str, &'static str)] = &[
+        (
+            &Uuid::NAMESPACE_DNS,
+            "example.org",
+            "aad03681-8b63-5304-89e0-8ca8f49461b5",
+        ),
+        (
+            &Uuid::NAMESPACE_DNS,
+            "rust-lang.org",
+            "c66bbb60-d62e-5f17-a399-3a0bd237c503",
+        ),
+        (
+            &Uuid::NAMESPACE_DNS,
+            "42",
+            "7c411b5e-9d3f-50b5-9c28-62096e41c4ed",
+        ),
+        (
+            &Uuid::NAMESPACE_DNS,
+            "lorem ipsum",
+            "97886a05-8a68-5743-ad55-56ab2d61cf7b",
+        ),
+        (
+            &Uuid::NAMESPACE_URL,
+            "example.org",
+            "54a35416-963c-5dd6-a1e2-5ab7bb5bafc7",
+        ),
+        (
+            &Uuid::NAMESPACE_URL,
+            "rust-lang.org",
+            "c48d927f-4122-5413-968c-598b1780e749",
+        ),
+        (
+            &Uuid::NAMESPACE_URL,
+            "42",
+            "5c2b23de-4bad-58ee-a4b3-f22f3b9cfd7d",
+        ),
+        (
+            &Uuid::NAMESPACE_URL,
+            "lorem ipsum",
+            "15c67689-4b85-5253-86b4-49fbb138569f",
+        ),
+        (
+            &Uuid::NAMESPACE_OID,
+            "example.org",
+            "34784df9-b065-5094-92c7-00bb3da97a30",
+        ),
+        (
+            &Uuid::NAMESPACE_OID,
+            "rust-lang.org",
+            "8ef61ecb-977a-5844-ab0f-c25ef9b8d5d6",
+        ),
+        (
+            &Uuid::NAMESPACE_OID,
+            "42",
+            "ba293c61-ad33-57b9-9671-f3319f57d789",
+        ),
+        (
+            &Uuid::NAMESPACE_OID,
+            "lorem ipsum",
+            "6485290d-f79e-5380-9e64-cb4312c7b4a6",
+        ),
+        (
+            &Uuid::NAMESPACE_X500,
+            "example.org",
+            "e3635e86-f82b-5bbc-a54a-da97923e5c76",
+        ),
+        (
+            &Uuid::NAMESPACE_X500,
+            "rust-lang.org",
+            "26c9c3e9-49b7-56da-8b9f-a0fb916a71a3",
+        ),
+        (
+            &Uuid::NAMESPACE_X500,
+            "42",
+            "e4b88014-47c6-5fe0-a195-13710e5f6e27",
+        ),
+        (
+            &Uuid::NAMESPACE_X500,
+            "lorem ipsum",
+            "b11f79a5-1e6d-57ce-a4b5-ba8531ea03d0",
+        ),
+    ];
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_get_version() {
+        let uuid = Uuid::new_v5(&Uuid::NAMESPACE_DNS, "rust-lang.org".as_bytes());
+
+        assert_eq!(uuid.get_version(), Some(Version::Sha1));
+        assert_eq!(uuid.get_version_num(), 5);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_hyphenated() {
+        for &(ref ns, ref name, ref expected) in FIXTURE {
+            let uuid = Uuid::new_v5(*ns, name.as_bytes());
+
+            assert_eq!(uuid.hyphenated().to_string(), *expected)
+        }
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new() {
+        for &(ref ns, ref name, ref u) in FIXTURE {
+            let uuid = Uuid::new_v5(*ns, name.as_bytes());
+
+            assert_eq!(uuid.get_version(), Some(Version::Sha1));
+            assert_eq!(uuid.get_variant(), Variant::RFC4122);
+            assert_eq!(Ok(uuid), u.parse());
+        }
+    }
+}
diff --git a/third_party/rust/uuid/src/v6.rs b/third_party/rust/uuid/src/v6.rs
new file mode 100644
index 0000000000..07644fd4fa
--- /dev/null
+++ b/third_party/rust/uuid/src/v6.rs
@@ -0,0 +1,177 @@
+//! The implementation for Version 6 UUIDs.
+//!
+//! Note that you need to enable the `v6` Cargo feature
+//! in order to use this module.
+
+use crate::{Builder, Timestamp, Uuid};
+
+impl Uuid {
+    /// Create a new version 6 UUID using the current system time and node ID.
+    ///
+    /// This method is only available if the `std` feature is enabled.
+    ///
+    /// This method is a convenient alternative to [`Uuid::new_v6`] that uses the current system time
+    /// as the source timestamp.
+    ///
+    /// Note that usage of this method requires the `v6`, `std`, and `rng` features of this crate
+    /// to be enabled.
+    #[cfg(all(feature = "std", feature = "rng"))]
+    pub fn now_v6(node_id: &[u8; 6]) -> Self {
+        let ts = Timestamp::now(crate::timestamp::context::shared_context());
+
+        Self::new_v6(ts, node_id)
+    }
+
+    /// Create a new version 6 UUID using the given timestamp and a node ID.
+    ///
+    /// This is similar to version 1 UUIDs, except that it is lexicographically sortable by timestamp.
+    ///
+    /// Also see [`Uuid::now_v6`] for a convenient way to generate version 6
+    /// UUIDs using the current system time.
+    ///
+    /// When generating [`Timestamp`]s using a [`ClockSequence`], this function
+    /// is only guaranteed to produce unique values if the following conditions
+    /// hold:
+    ///
+    /// 1. The *node ID* is unique for this process,
+    /// 2. The *context* is shared across all threads which are generating version 6
+    ///    UUIDs,
+    /// 3. The [`ClockSequence`] implementation reliably returns unique
+    ///    clock sequences (this crate provides [`Context`] for this
+    ///    purpose. However you can create your own [`ClockSequence`]
+    ///    implementation, if [`Context`] does not meet your needs).
+    ///
+    /// The NodeID must be exactly 6 bytes long.
+    ///
+    /// Note that usage of this method requires the `v6` feature of this crate
+    /// to be enabled.
+    ///
+    /// # Examples
+    ///
+    /// A UUID can be created from a unix [`Timestamp`] with a
+    /// [`ClockSequence`]. RFC4122 requires the clock sequence
+    /// is seeded with a random value:
+    ///
+    /// ```rust
+    /// # use uuid::{Uuid, Timestamp, Context};
+    /// # fn random_seed() -> u16 { 42 }
+    /// let context = Context::new(random_seed());
+    /// let ts = Timestamp::from_unix(context, 1497624119, 1234);
+    ///
+    /// let uuid = Uuid::new_v6(ts, &[1, 2, 3, 4, 5, 6]);
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "1e752a1f-3b49-658c-802a-010203040506"
+    /// );
+    /// ```
+    ///
+    /// The timestamp can also be created manually as per RFC4122:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Timestamp, Context, ClockSequence};
+    /// # fn random_seed() -> u16 { 42 }
+    /// let context = Context::new(random_seed());
+    /// let ts = Timestamp::from_rfc4122(14976241191231231313, context.generate_sequence(0, 0) );
+    ///
+    /// let uuid = Uuid::new_v6(ts, &[1, 2, 3, 4, 5, 6]);
+    ///
+    /// assert_eq!(
+    ///     uuid.hyphenated().to_string(),
+    ///     "fd64c041-1e91-6551-802a-010203040506"
+    /// );
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version 6 UUIDs in Draft RFC: New UUID Formats, Version 4](https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04#section-5.1)
+    ///
+    /// [`Timestamp`]: v1/struct.Timestamp.html
+    /// [`ClockSequence`]: v1/trait.ClockSequence.html
+    /// [`Context`]: v1/struct.Context.html
+    pub fn new_v6(ts: Timestamp, node_id: &[u8; 6]) -> Self {
+        let (ticks, counter) = ts.to_rfc4122();
+
+        Builder::from_sorted_rfc4122_timestamp(ticks, counter, node_id).into_uuid()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{Context, Variant, Version};
+    use std::string::ToString;
+
+    #[cfg(target_arch = "wasm32")]
+    use wasm_bindgen_test::*;
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new() {
+        let time: u64 = 1_496_854_535;
+        let time_fraction: u32 = 812_946_000;
+        let node = [1, 2, 3, 4, 5, 6];
+        let context = Context::new(0);
+
+        let uuid = Uuid::new_v6(Timestamp::from_unix(context, time, time_fraction), &node);
+
+        assert_eq!(uuid.get_version(), Some(Version::SortMac));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+        assert_eq!(
+            uuid.hyphenated().to_string(),
+            "1e74ba22-0616-6934-8000-010203040506"
+        );
+
+        let ts = uuid.get_timestamp().unwrap().to_rfc4122();
+
+        assert_eq!(ts.0 - 0x01B2_1DD2_1381_4000, 14_968_545_358_129_460);
+
+        // Ensure parsing the same UUID produces the same timestamp
+        let parsed = Uuid::parse_str("1e74ba22-0616-6934-8000-010203040506").unwrap();
+
+        assert_eq!(
+            uuid.get_timestamp().unwrap(),
+            parsed.get_timestamp().unwrap()
+        );
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    #[cfg(all(feature = "std", feature = "rng"))]
+    fn test_now() {
+        let node = [1, 2, 3, 4, 5, 6];
+
+        let uuid = Uuid::now_v6(&node);
+
+        assert_eq!(uuid.get_version(), Some(Version::SortMac));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new_context() {
+        let time: u64 = 1_496_854_535;
+        let time_fraction: u32 = 812_946_000;
+        let node = [1, 2, 3, 4, 5, 6];
+
+        // This context will wrap
+        let context = Context::new((u16::MAX >> 2) - 1);
+
+        let uuid1 = Uuid::new_v6(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        let time: u64 = 1_496_854_536;
+
+        let uuid2 = Uuid::new_v6(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        assert_eq!(uuid1.get_timestamp().unwrap().to_rfc4122().1, 16382);
+        assert_eq!(uuid2.get_timestamp().unwrap().to_rfc4122().1, 0);
+
+        let time = 1_496_854_535;
+
+        let uuid3 = Uuid::new_v6(Timestamp::from_unix(&context, time, time_fraction), &node);
+        let uuid4 = Uuid::new_v6(Timestamp::from_unix(&context, time, time_fraction), &node);
+
+        assert_eq!(uuid3.get_timestamp().unwrap().counter, 1);
+        assert_eq!(uuid4.get_timestamp().unwrap().counter, 2);
+    }
+}
diff --git a/third_party/rust/uuid/src/v7.rs b/third_party/rust/uuid/src/v7.rs
new file mode 100644
index 0000000000..4497ea3f51
--- /dev/null
+++ b/third_party/rust/uuid/src/v7.rs
@@ -0,0 +1,124 @@
+//! The implementation for Version 7 UUIDs.
+//!
+//! Note that you need to enable the `v7` Cargo feature
+//! in order to use this module.
+
+use crate::{std::convert::TryInto, rng, timestamp::Timestamp, Builder, Uuid};
+
+impl Uuid {
+    /// Create a new version 7 UUID using the current time value and random bytes.
+    ///
+    /// This method is a convenient alternative to [`Uuid::new_v7`] that uses the current system time
+    /// as the source timestamp.
+    #[cfg(feature = "std")]
+    pub fn now_v7() -> Self {
+        Self::new_v7(Timestamp::now(crate::NoContext))
+    }
+
+    /// Create a new version 7 UUID using a time value and random bytes.
+    ///
+    /// When the `std` feature is enabled, you can also use [`Uuid::now_v7`].
+    ///
+    /// Note that usage of this method requires the `v7` feature of this crate
+    /// to be enabled.
+    ///
+    /// Also see [`Uuid::now_v7`] for a convenient way to generate version 7
+    /// UUIDs using the current system time.
+    ///
+    /// # Examples
+    ///
+    /// A v7 UUID can be created from a unix [`Timestamp`] plus a 128 bit
+    /// random number. When supplied as such, the data will be
+    ///
+    /// ```rust
+    /// # use uuid::{Uuid, Timestamp, NoContext};
+    /// let ts = Timestamp::from_unix(NoContext, 1497624119, 1234);
+    ///
+    /// let uuid = Uuid::new_v7(ts);
+    ///
+    /// assert!(
+    ///     uuid.hyphenated().to_string().starts_with("015cb15a-86d8-7")
+    /// );
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version 7 UUIDs in Draft RFC: New UUID Formats, Version 4](https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04#section-5.2)
+    pub fn new_v7(ts: Timestamp) -> Self {
+        let (secs, nanos) = ts.to_unix();
+        let millis = (secs * 1000).saturating_add(nanos as u64 / 1_000_000);
+
+        Builder::from_unix_timestamp_millis(millis, &rng::bytes()[..10].try_into().unwrap())
+            .into_uuid()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{std::string::ToString, NoContext, Variant, Version};
+    #[cfg(target_arch = "wasm32")]
+    use wasm_bindgen_test::*;
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new() {
+        let ts: u64 = 1645557742000;
+
+        let seconds = ts / 1000;
+        let nanos = ((ts % 1000) * 1_000_000) as u32;
+
+        let uuid = Uuid::new_v7(Timestamp::from_unix(NoContext, seconds, nanos));
+        let uustr = uuid.hyphenated().to_string();
+
+        assert_eq!(uuid.get_version(), Some(Version::SortRand));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+        assert!(uuid.hyphenated().to_string().starts_with("017f22e2-79b0-7"));
+
+        // Ensure parsing the same UUID produces the same timestamp
+        let parsed = Uuid::parse_str(uustr.as_str()).unwrap();
+
+        assert_eq!(uuid, parsed);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    #[cfg(feature = "std")]
+    fn test_now() {
+        let uuid = Uuid::now_v7();
+
+        assert_eq!(uuid.get_version(), Some(Version::SortRand));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_sorting() {
+        let time1: u64 = 1_496_854_535;
+        let time_fraction1: u32 = 812_000_000;
+
+        let time2 = time1 + 4000;
+        let time_fraction2 = time_fraction1;
+
+        let uuid1 = Uuid::new_v7(Timestamp::from_unix(NoContext, time1, time_fraction1));
+        let uuid2 = Uuid::new_v7(Timestamp::from_unix(NoContext, time2, time_fraction2));
+
+        assert!(uuid1.as_bytes() < uuid2.as_bytes());
+        assert!(uuid1.to_string() < uuid2.to_string());
+    }
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new_timestamp_roundtrip() {
+        let time: u64 = 1_496_854_535;
+        let time_fraction: u32 = 812_000_000;
+
+        let ts = Timestamp::from_unix(NoContext, time, time_fraction);
+
+        let uuid = Uuid::new_v7(ts);
+
+        let decoded_ts = uuid.get_timestamp().unwrap();
+
+        assert_eq!(ts.to_unix(), decoded_ts.to_unix());
+    }
+}
diff --git a/third_party/rust/uuid/src/v8.rs b/third_party/rust/uuid/src/v8.rs
new file mode 100644
index 0000000000..a54a979805
--- /dev/null
+++ b/third_party/rust/uuid/src/v8.rs
@@ -0,0 +1,57 @@
+use crate::{Builder, Uuid};
+
+impl Uuid {
+    /// Creates a custom UUID comprised almost entirely of user-supplied bytes.
+    ///
+    /// This will inject the UUID Version at 4 bits starting at the 48th bit
+    /// and the Variant into 2 bits 64th bit. Any existing bits in the user-supplied bytes
+    /// at those locations will be overridden.
+    ///
+    /// Note that usage of this method requires the `v8` feature of this crate
+    /// to be enabled.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Version};
+    /// let buf: [u8; 16] = *b"abcdefghijklmnop";
+    /// let uuid = Uuid::new_v8(buf);
+    ///
+    /// assert_eq!(Some(Version::Custom), uuid.get_version());
+    /// ```
+    ///
+    /// # References
+    ///
+    /// * [Version 8 UUIDs in Draft RFC: New UUID Formats, Version 4](https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04#section-5.3)
+    pub fn new_v8(buf: [u8; 16]) -> Uuid {
+        Builder::from_custom_bytes(buf).into_uuid()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{Variant, Version};
+    use std::string::ToString;
+
+    #[cfg(target_arch = "wasm32")]
+    use wasm_bindgen_test::*;
+
+    #[test]
+    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+    fn test_new() {
+        let buf: [u8; 16] = [
+            0xf, 0xe, 0xd, 0xc, 0xb, 0xa, 0x9, 0x8, 0x7, 0x6, 0x5, 0x4, 0x3, 0x2, 0x1, 0x0,
+        ];
+        let uuid = Uuid::new_v8(buf);
+        assert_eq!(uuid.get_version(), Some(Version::Custom));
+        assert_eq!(uuid.get_variant(), Variant::RFC4122);
+        assert_eq!(uuid.get_version_num(), 8);
+        assert_eq!(
+            uuid.hyphenated().to_string(),
+            "0f0e0d0c-0b0a-8908-8706-050403020100"
+        );
+    }
+}