Merging upstream version 1.70.0+dfsg2.

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

7 files changed, 947 insertions, 0 deletions

diff --git a/vendor/toml_datetime/.cargo-checksum.json b/vendor/toml_datetime/.cargo-checksum.json
new file mode 100644
index 000000000..1dcac3798
--- /dev/null
+++ b/vendor/toml_datetime/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"Cargo.toml":"d0b973ff31ce9c14256cba2a48b94313537e9c146414934916bdaaddd58ec83c","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"378f5840b258e2779c39418f3f2d7b2ba96f1c7917dd6be0713f88305dbda397","README.md":"a9540c57fbfade8959d34804427d9f37ccae9e24a9fc469bcf413c2089601f0d","src/datetime.rs":"9f85adaa87398164dbaa72c7ef4c7328cda7d9fa1478142b88fbe4de9551b53e","src/lib.rs":"91f3fe49647af4987a49b5aaa8c3175f02c05fa9ac45e7c49dbee61566230476"},"package":"3ab8ed2edee10b50132aed5f331333428b011c99402b5a534154ed15746f9622"}
\ No newline at end of file
diff --git a/vendor/toml_datetime/Cargo.toml b/vendor/toml_datetime/Cargo.toml
new file mode 100644
index 000000000..690ab5bb4
--- /dev/null
+++ b/vendor/toml_datetime/Cargo.toml
@@ -0,0 +1,88 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+rust-version = "1.60.0"
+name = "toml_datetime"
+version = "0.6.1"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+include = [
+    "src/**/*",
+    "Cargo.toml",
+    "LICENSE*",
+    "README.md",
+    "examples/**/*",
+    "benches/**/*",
+    "tests/**/*",
+]
+description = "A TOML-compatible datetime type"
+homepage = "https://github.com/toml-rs/toml"
+documentation = "https://docs.rs/toml_datetime"
+readme = "README.md"
+keywords = [
+    "encoding",
+    "toml",
+]
+categories = [
+    "encoding",
+    "parser-implementations",
+    "parsing",
+    "config",
+]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/toml-rs/toml"
+
+[[package.metadata.release.pre-release-replacements]]
+file = "CHANGELOG.md"
+search = "Unreleased"
+replace = "{{version}}"
+min = 1
+
+[[package.metadata.release.pre-release-replacements]]
+file = "CHANGELOG.md"
+search = '\.\.\.HEAD'
+replace = "...{{tag_name}}"
+exactly = 1
+
+[[package.metadata.release.pre-release-replacements]]
+file = "CHANGELOG.md"
+search = "ReleaseDate"
+replace = "{{date}}"
+min = 1
+
+[[package.metadata.release.pre-release-replacements]]
+file = "CHANGELOG.md"
+search = "<!-- next-header -->"
+replace = """
+<!-- next-header -->
+## [Unreleased] - ReleaseDate
+"""
+exactly = 1
+
+[[package.metadata.release.pre-release-replacements]]
+file = "CHANGELOG.md"
+search = "<!-- next-url -->"
+replace = """
+<!-- next-url -->
+[Unreleased]: https://github.com/toml-rs/toml/compare/{{tag_name}}...HEAD"""
+exactly = 1
+
+[package.metadata.docs.rs]
+rustdoc-args = [
+    "--cfg",
+    "docsrs",
+]
+all-features = true
+
+[dependencies.serde]
+version = "1.0.145"
+optional = true
diff --git a/vendor/toml_datetime/LICENSE-APACHE b/vendor/toml_datetime/LICENSE-APACHE
new file mode 100644
index 000000000..16fe87b06
--- /dev/null
+++ b/vendor/toml_datetime/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
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+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
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+6. Trademarks. This License does not grant permission to use the trade
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+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+8. Limitation of Liability. In no event and under no legal theory,
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+Copyright [yyyy] [name of copyright owner]
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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
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+	http://www.apache.org/licenses/LICENSE-2.0
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+Unless required by applicable law or agreed to in writing, software
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diff --git a/vendor/toml_datetime/LICENSE-MIT b/vendor/toml_datetime/LICENSE-MIT
new file mode 100644
index 000000000..39e0ed660
--- /dev/null
+++ b/vendor/toml_datetime/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2014 Alex Crichton
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/vendor/toml_datetime/README.md b/vendor/toml_datetime/README.md
new file mode 100644
index 000000000..67d1da4b7
--- /dev/null
+++ b/vendor/toml_datetime/README.md
@@ -0,0 +1,21 @@
+# toml_datetime
+
+[![Latest Version](https://img.shields.io/crates/v/toml_datetime.svg)](https://crates.io/crates/toml_datetime)
+[![Documentation](https://docs.rs/toml_datetime/badge.svg)](https://docs.rs/toml_datetime)
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in toml-rs by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
diff --git a/vendor/toml_datetime/src/datetime.rs b/vendor/toml_datetime/src/datetime.rs
new file mode 100644
index 000000000..15781b915
--- /dev/null
+++ b/vendor/toml_datetime/src/datetime.rs
@@ -0,0 +1,583 @@
+use std::error;
+use std::fmt;
+use std::str::{self, FromStr};
+
+#[cfg(feature = "serde")]
+use serde::{de, ser};
+
+/// A parsed TOML datetime value
+///
+/// This structure is intended to represent the datetime primitive type that can
+/// be encoded into TOML documents. This type is a parsed version that contains
+/// all metadata internally.
+///
+/// Currently this type is intentionally conservative and only supports
+/// `to_string` as an accessor. Over time though it's intended that it'll grow
+/// more support!
+///
+/// Note that if you're using `Deserialize` to deserialize a TOML document, you
+/// can use this as a placeholder for where you're expecting a datetime to be
+/// specified.
+///
+/// Also note though that while this type implements `Serialize` and
+/// `Deserialize` it's only recommended to use this type with the TOML format,
+/// otherwise encoded in other formats it may look a little odd.
+///
+/// Depending on how the option values are used, this struct will correspond
+/// with one of the following four datetimes from the [TOML v1.0.0 spec]:
+///
+/// | `date`    | `time`    | `offset`  | TOML type          |
+/// | --------- | --------- | --------- | ------------------ |
+/// | `Some(_)` | `Some(_)` | `Some(_)` | [Offset Date-Time] |
+/// | `Some(_)` | `Some(_)` | `None`    | [Local Date-Time]  |
+/// | `Some(_)` | `None`    | `None`    | [Local Date]       |
+/// | `None`    | `Some(_)` | `None`    | [Local Time]       |
+///
+/// **1. Offset Date-Time**: If all the optional values are used, `Datetime`
+/// corresponds to an [Offset Date-Time]. From the TOML v1.0.0 spec:
+///
+/// > To unambiguously represent a specific instant in time, you may use an
+/// > RFC 3339 formatted date-time with offset.
+/// >
+/// > ```toml
+/// > odt1 = 1979-05-27T07:32:00Z
+/// > odt2 = 1979-05-27T00:32:00-07:00
+/// > odt3 = 1979-05-27T00:32:00.999999-07:00
+/// > ```
+/// >
+/// > For the sake of readability, you may replace the T delimiter between date
+/// > and time with a space character (as permitted by RFC 3339 section 5.6).
+/// >
+/// > ```toml
+/// > odt4 = 1979-05-27 07:32:00Z
+/// > ```
+///
+/// **2. Local Date-Time**: If `date` and `time` are given but `offset` is
+/// `None`, `Datetime` corresponds to a [Local Date-Time]. From the spec:
+///
+/// > If you omit the offset from an RFC 3339 formatted date-time, it will
+/// > represent the given date-time without any relation to an offset or
+/// > timezone. It cannot be converted to an instant in time without additional
+/// > information. Conversion to an instant, if required, is implementation-
+/// > specific.
+/// >
+/// > ```toml
+/// > ldt1 = 1979-05-27T07:32:00
+/// > ldt2 = 1979-05-27T00:32:00.999999
+/// > ```
+///
+/// **3. Local Date**: If only `date` is given, `Datetime` corresponds to a
+/// [Local Date]; see the docs for [`Date`].
+///
+/// **4. Local Time**: If only `time` is given, `Datetime` corresponds to a
+/// [Local Time]; see the docs for [`Time`].
+///
+/// [TOML v1.0.0 spec]: https://toml.io/en/v1.0.0
+/// [Offset Date-Time]: https://toml.io/en/v1.0.0#offset-date-time
+/// [Local Date-Time]: https://toml.io/en/v1.0.0#local-date-time
+/// [Local Date]: https://toml.io/en/v1.0.0#local-date
+/// [Local Time]: https://toml.io/en/v1.0.0#local-time
+#[derive(PartialEq, Eq, PartialOrd, Ord, Copy, Clone, Debug)]
+pub struct Datetime {
+    /// Optional date.
+    /// Required for: *Offset Date-Time*, *Local Date-Time*, *Local Date*.
+    pub date: Option<Date>,
+
+    /// Optional time.
+    /// Required for: *Offset Date-Time*, *Local Date-Time*, *Local Time*.
+    pub time: Option<Time>,
+
+    /// Optional offset.
+    /// Required for: *Offset Date-Time*.
+    pub offset: Option<Offset>,
+}
+
+/// Error returned from parsing a `Datetime` in the `FromStr` implementation.
+#[derive(Debug, Clone)]
+#[non_exhaustive]
+pub struct DatetimeParseError {}
+
+// Currently serde itself doesn't have a datetime type, so we map our `Datetime`
+// to a special value in the serde data model. Namely one with these special
+// fields/struct names.
+//
+// In general the TOML encoder/decoder will catch this and not literally emit
+// these strings but rather emit datetimes as they're intended.
+#[doc(hidden)]
+#[cfg(feature = "serde")]
+pub const FIELD: &str = "$__toml_private_datetime";
+#[doc(hidden)]
+#[cfg(feature = "serde")]
+pub const NAME: &str = "$__toml_private_Datetime";
+
+/// A parsed TOML date value
+///
+/// May be part of a [`Datetime`]. Alone, `Date` corresponds to a [Local Date].
+/// From the TOML v1.0.0 spec:
+///
+/// > If you include only the date portion of an RFC 3339 formatted date-time,
+/// > it will represent that entire day without any relation to an offset or
+/// > timezone.
+/// >
+/// > ```toml
+/// > ld1 = 1979-05-27
+/// > ```
+///
+/// [Local Date]: https://toml.io/en/v1.0.0#local-date
+#[derive(PartialEq, Eq, PartialOrd, Ord, Copy, Clone, Debug)]
+pub struct Date {
+    /// Year: four digits
+    pub year: u16,
+    /// Month: 1 to 12
+    pub month: u8,
+    /// Day: 1 to {28, 29, 30, 31} (based on month/year)
+    pub day: u8,
+}
+
+/// A parsed TOML time value
+///
+/// May be part of a [`Datetime`]. Alone, `Time` corresponds to a [Local Time].
+/// From the TOML v1.0.0 spec:
+///
+/// > If you include only the time portion of an RFC 3339 formatted date-time,
+/// > it will represent that time of day without any relation to a specific
+/// > day or any offset or timezone.
+/// >
+/// > ```toml
+/// > lt1 = 07:32:00
+/// > lt2 = 00:32:00.999999
+/// > ```
+/// >
+/// > Millisecond precision is required. Further precision of fractional
+/// > seconds is implementation-specific. If the value contains greater
+/// > precision than the implementation can support, the additional precision
+/// > must be truncated, not rounded.
+///
+/// [Local Time]: https://toml.io/en/v1.0.0#local-time
+#[derive(PartialEq, Eq, PartialOrd, Ord, Copy, Clone, Debug)]
+pub struct Time {
+    /// Hour: 0 to 23
+    pub hour: u8,
+    /// Minute: 0 to 59
+    pub minute: u8,
+    /// Second: 0 to {58, 59, 60} (based on leap second rules)
+    pub second: u8,
+    /// Nanosecond: 0 to 999_999_999
+    pub nanosecond: u32,
+}
+
+/// A parsed TOML time offset
+///
+#[derive(PartialEq, Eq, PartialOrd, Ord, Copy, Clone, Debug)]
+pub enum Offset {
+    /// > A suffix which, when applied to a time, denotes a UTC offset of 00:00;
+    /// > often spoken "Zulu" from the ICAO phonetic alphabet representation of
+    /// > the letter "Z". --- [RFC 3339 section 2]
+    ///
+    /// [RFC 3339 section 2]: https://datatracker.ietf.org/doc/html/rfc3339#section-2
+    Z,
+
+    /// Offset between local time and UTC
+    Custom {
+        /// Minutes: -1_440..1_440
+        minutes: i16,
+    },
+}
+
+impl From<Date> for Datetime {
+    fn from(other: Date) -> Self {
+        Datetime {
+            date: Some(other),
+            time: None,
+            offset: None,
+        }
+    }
+}
+
+impl From<Time> for Datetime {
+    fn from(other: Time) -> Self {
+        Datetime {
+            date: None,
+            time: Some(other),
+            offset: None,
+        }
+    }
+}
+
+impl fmt::Display for Datetime {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if let Some(ref date) = self.date {
+            write!(f, "{}", date)?;
+        }
+        if let Some(ref time) = self.time {
+            if self.date.is_some() {
+                write!(f, "T")?;
+            }
+            write!(f, "{}", time)?;
+        }
+        if let Some(ref offset) = self.offset {
+            write!(f, "{}", offset)?;
+        }
+        Ok(())
+    }
+}
+
+impl fmt::Display for Date {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{:04}-{:02}-{:02}", self.year, self.month, self.day)
+    }
+}
+
+impl fmt::Display for Time {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{:02}:{:02}:{:02}", self.hour, self.minute, self.second)?;
+        if self.nanosecond != 0 {
+            let s = format!("{:09}", self.nanosecond);
+            write!(f, ".{}", s.trim_end_matches('0'))?;
+        }
+        Ok(())
+    }
+}
+
+impl fmt::Display for Offset {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            Offset::Z => write!(f, "Z"),
+            Offset::Custom { mut minutes } => {
+                let mut sign = '+';
+                if minutes < 0 {
+                    minutes *= -1;
+                    sign = '-';
+                }
+                let hours = minutes / 60;
+                let minutes = minutes % 60;
+                write!(f, "{}{:02}:{:02}", sign, hours, minutes)
+            }
+        }
+    }
+}
+
+impl FromStr for Datetime {
+    type Err = DatetimeParseError;
+
+    fn from_str(date: &str) -> Result<Datetime, DatetimeParseError> {
+        // Accepted formats:
+        //
+        // 0000-00-00T00:00:00.00Z
+        // 0000-00-00T00:00:00.00
+        // 0000-00-00
+        // 00:00:00.00
+        if date.len() < 3 {
+            return Err(DatetimeParseError {});
+        }
+        let mut offset_allowed = true;
+        let mut chars = date.chars();
+
+        // First up, parse the full date if we can
+        let full_date = if chars.clone().nth(2) == Some(':') {
+            offset_allowed = false;
+            None
+        } else {
+            let y1 = u16::from(digit(&mut chars)?);
+            let y2 = u16::from(digit(&mut chars)?);
+            let y3 = u16::from(digit(&mut chars)?);
+            let y4 = u16::from(digit(&mut chars)?);
+
+            match chars.next() {
+                Some('-') => {}
+                _ => return Err(DatetimeParseError {}),
+            }
+
+            let m1 = digit(&mut chars)?;
+            let m2 = digit(&mut chars)?;
+
+            match chars.next() {
+                Some('-') => {}
+                _ => return Err(DatetimeParseError {}),
+            }
+
+            let d1 = digit(&mut chars)?;
+            let d2 = digit(&mut chars)?;
+
+            let date = Date {
+                year: y1 * 1000 + y2 * 100 + y3 * 10 + y4,
+                month: m1 * 10 + m2,
+                day: d1 * 10 + d2,
+            };
+
+            if date.month < 1 || date.month > 12 {
+                return Err(DatetimeParseError {});
+            }
+            if date.day < 1 || date.day > 31 {
+                return Err(DatetimeParseError {});
+            }
+
+            Some(date)
+        };
+
+        // Next parse the "partial-time" if available
+        let next = chars.clone().next();
+        let partial_time = if full_date.is_some()
+            && (next == Some('T') || next == Some('t') || next == Some(' '))
+        {
+            chars.next();
+            true
+        } else {
+            full_date.is_none()
+        };
+
+        let time = if partial_time {
+            let h1 = digit(&mut chars)?;
+            let h2 = digit(&mut chars)?;
+            match chars.next() {
+                Some(':') => {}
+                _ => return Err(DatetimeParseError {}),
+            }
+            let m1 = digit(&mut chars)?;
+            let m2 = digit(&mut chars)?;
+            match chars.next() {
+                Some(':') => {}
+                _ => return Err(DatetimeParseError {}),
+            }
+            let s1 = digit(&mut chars)?;
+            let s2 = digit(&mut chars)?;
+
+            let mut nanosecond = 0;
+            if chars.clone().next() == Some('.') {
+                chars.next();
+                let whole = chars.as_str();
+
+                let mut end = whole.len();
+                for (i, byte) in whole.bytes().enumerate() {
+                    match byte {
+                        b'0'..=b'9' => {
+                            if i < 9 {
+                                let p = 10_u32.pow(8 - i as u32);
+                                nanosecond += p * u32::from(byte - b'0');
+                            }
+                        }
+                        _ => {
+                            end = i;
+                            break;
+                        }
+                    }
+                }
+                if end == 0 {
+                    return Err(DatetimeParseError {});
+                }
+                chars = whole[end..].chars();
+            }
+
+            let time = Time {
+                hour: h1 * 10 + h2,
+                minute: m1 * 10 + m2,
+                second: s1 * 10 + s2,
+                nanosecond,
+            };
+
+            if time.hour > 24 {
+                return Err(DatetimeParseError {});
+            }
+            if time.minute > 59 {
+                return Err(DatetimeParseError {});
+            }
+            if time.second > 59 {
+                return Err(DatetimeParseError {});
+            }
+            if time.nanosecond > 999_999_999 {
+                return Err(DatetimeParseError {});
+            }
+
+            Some(time)
+        } else {
+            offset_allowed = false;
+            None
+        };
+
+        // And finally, parse the offset
+        let offset = if offset_allowed {
+            let next = chars.clone().next();
+            if next == Some('Z') || next == Some('z') {
+                chars.next();
+                Some(Offset::Z)
+            } else if next.is_none() {
+                None
+            } else {
+                let sign = match next {
+                    Some('+') => 1,
+                    Some('-') => -1,
+                    _ => return Err(DatetimeParseError {}),
+                };
+                chars.next();
+                let h1 = digit(&mut chars)? as i16;
+                let h2 = digit(&mut chars)? as i16;
+                match chars.next() {
+                    Some(':') => {}
+                    _ => return Err(DatetimeParseError {}),
+                }
+                let m1 = digit(&mut chars)? as i16;
+                let m2 = digit(&mut chars)? as i16;
+
+                let hours = h1 * 10 + h2;
+                let minutes = m1 * 10 + m2;
+
+                let total_minutes = sign * (hours * 60 + minutes);
+
+                if !((-24 * 60)..=(24 * 60)).contains(&total_minutes) {
+                    return Err(DatetimeParseError {});
+                }
+
+                Some(Offset::Custom {
+                    minutes: total_minutes,
+                })
+            }
+        } else {
+            None
+        };
+
+        // Return an error if we didn't hit eof, otherwise return our parsed
+        // date
+        if chars.next().is_some() {
+            return Err(DatetimeParseError {});
+        }
+
+        Ok(Datetime {
+            date: full_date,
+            time,
+            offset,
+        })
+    }
+}
+
+fn digit(chars: &mut str::Chars<'_>) -> Result<u8, DatetimeParseError> {
+    match chars.next() {
+        Some(c) if ('0'..='9').contains(&c) => Ok(c as u8 - b'0'),
+        _ => Err(DatetimeParseError {}),
+    }
+}
+
+#[cfg(feature = "serde")]
+impl ser::Serialize for Datetime {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: ser::Serializer,
+    {
+        use serde::ser::SerializeStruct;
+
+        let mut s = serializer.serialize_struct(NAME, 1)?;
+        s.serialize_field(FIELD, &self.to_string())?;
+        s.end()
+    }
+}
+
+#[cfg(feature = "serde")]
+impl<'de> de::Deserialize<'de> for Datetime {
+    fn deserialize<D>(deserializer: D) -> Result<Datetime, D::Error>
+    where
+        D: de::Deserializer<'de>,
+    {
+        struct DatetimeVisitor;
+
+        impl<'de> de::Visitor<'de> for DatetimeVisitor {
+            type Value = Datetime;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a TOML datetime")
+            }
+
+            fn visit_map<V>(self, mut visitor: V) -> Result<Datetime, V::Error>
+            where
+                V: de::MapAccess<'de>,
+            {
+                let value = visitor.next_key::<DatetimeKey>()?;
+                if value.is_none() {
+                    return Err(de::Error::custom("datetime key not found"));
+                }
+                let v: DatetimeFromString = visitor.next_value()?;
+                Ok(v.value)
+            }
+        }
+
+        static FIELDS: [&str; 1] = [FIELD];
+        deserializer.deserialize_struct(NAME, &FIELDS, DatetimeVisitor)
+    }
+}
+
+#[cfg(feature = "serde")]
+struct DatetimeKey;
+
+#[cfg(feature = "serde")]
+impl<'de> de::Deserialize<'de> for DatetimeKey {
+    fn deserialize<D>(deserializer: D) -> Result<DatetimeKey, D::Error>
+    where
+        D: de::Deserializer<'de>,
+    {
+        struct FieldVisitor;
+
+        impl<'de> de::Visitor<'de> for FieldVisitor {
+            type Value = ();
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a valid datetime field")
+            }
+
+            fn visit_str<E>(self, s: &str) -> Result<(), E>
+            where
+                E: de::Error,
+            {
+                if s == FIELD {
+                    Ok(())
+                } else {
+                    Err(de::Error::custom("expected field with custom name"))
+                }
+            }
+        }
+
+        deserializer.deserialize_identifier(FieldVisitor)?;
+        Ok(DatetimeKey)
+    }
+}
+
+#[doc(hidden)]
+#[cfg(feature = "serde")]
+pub struct DatetimeFromString {
+    pub value: Datetime,
+}
+
+#[cfg(feature = "serde")]
+impl<'de> de::Deserialize<'de> for DatetimeFromString {
+    fn deserialize<D>(deserializer: D) -> Result<DatetimeFromString, D::Error>
+    where
+        D: de::Deserializer<'de>,
+    {
+        struct Visitor;
+
+        impl<'de> de::Visitor<'de> for Visitor {
+            type Value = DatetimeFromString;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("string containing a datetime")
+            }
+
+            fn visit_str<E>(self, s: &str) -> Result<DatetimeFromString, E>
+            where
+                E: de::Error,
+            {
+                match s.parse() {
+                    Ok(date) => Ok(DatetimeFromString { value: date }),
+                    Err(e) => Err(de::Error::custom(e)),
+                }
+            }
+        }
+
+        deserializer.deserialize_str(Visitor)
+    }
+}
+
+impl fmt::Display for DatetimeParseError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        "failed to parse datetime".fmt(f)
+    }
+}
+
+impl error::Error for DatetimeParseError {}
diff --git a/vendor/toml_datetime/src/lib.rs b/vendor/toml_datetime/src/lib.rs
new file mode 100644
index 000000000..4df40dca8
--- /dev/null
+++ b/vendor/toml_datetime/src/lib.rs
@@ -0,0 +1,28 @@
+//! A [TOML]-compatible datetime type
+//!
+//! [TOML]: https://github.com/toml-lang/toml
+
+#![deny(missing_docs)]
+#![warn(rust_2018_idioms)]
+// Makes rustc abort compilation if there are any unsafe blocks in the crate.
+// Presence of this annotation is picked up by tools such as cargo-geiger
+// and lets them ensure that there is indeed no unsafe code as opposed to
+// something they couldn't detect (e.g. unsafe added via macro expansion, etc).
+#![forbid(unsafe_code)]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+
+mod datetime;
+
+pub use crate::datetime::Date;
+pub use crate::datetime::Datetime;
+pub use crate::datetime::DatetimeParseError;
+pub use crate::datetime::Offset;
+pub use crate::datetime::Time;
+
+#[doc(hidden)]
+#[cfg(feature = "serde")]
+pub mod __unstable {
+    pub use crate::datetime::DatetimeFromString;
+    pub use crate::datetime::FIELD;
+    pub use crate::datetime::NAME;
+}