Merging upstream version 1.70.0+dfsg2.

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

18 files changed, 3661 insertions, 0 deletions

diff --git a/vendor/arrayvec-0.5.2/.cargo-checksum.json b/vendor/arrayvec-0.5.2/.cargo-checksum.json
new file mode 100644
index 000000000..f69428e40
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/.cargo-checksum.json
@@ -0,0 +1 @@
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diff --git a/vendor/arrayvec-0.5.2/CHANGELOG.md b/vendor/arrayvec-0.5.2/CHANGELOG.md
new file mode 100644
index 000000000..9ee813cfc
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/CHANGELOG.md
@@ -0,0 +1,234 @@
+Recent Changes (arrayvec)
+-------------------------
+
+- 0.5.2
+
+  - Add `is_empty` methods for ArrayVec and ArrayString by @nicbn
+  - Implement `TryFrom<Slice>` for ArrayVec by @paulkernfeld
+  - Add `unstable-const-fn` to make `new` methods const by @m-ou-se
+  - Run miri in CI and a few related fixes by @RalfJung
+  - Fix outdated comment by @Phlosioneer
+  - Move changelog to a separate file by @Luro02
+  - Remove deprecated `Error::description` by @AnderEnder
+  - Use pointer method `add` by @hbina
+
+- 0.5.1
+
+  - Add `as_ptr`, `as_mut_ptr` accessors directly on the `ArrayVec` by @tbu-
+    (matches the same addition to `Vec` which happened in Rust 1.37).
+  - Add method `ArrayString::len` (now available directly, not just through deref to str).
+  - Use raw pointers instead of `&mut [u8]` for encoding chars into `ArrayString`
+    (uninit best practice fix).
+  - Use raw pointers instead of `get_unchecked_mut` where the target may be
+    uninitialized everywhere relevant in the ArrayVec implementation
+    (uninit best practice fix).
+  - Changed inline hints on many methods, mainly removing inline hints
+  - `ArrayVec::dispose` is now deprecated (it has no purpose anymore)
+
+- 0.4.12
+
+  - Use raw pointers instead of `get_unchecked_mut` where the target may be
+    uninitialized everywhere relevant in the ArrayVec implementation.
+
+- 0.5.0
+
+  - Use `MaybeUninit` (now unconditionally) in the implementation of
+    `ArrayVec`
+  - Use `MaybeUninit` (now unconditionally) in the implementation of
+    `ArrayString`
+  - The crate feature for serde serialization is now named `serde`.
+  - Updated the `Array` trait interface, and it is now easier to use for
+    users outside the crate.
+  - Add `FromStr` impl for `ArrayString` by @despawnerer
+  - Add method `try_extend_from_slice` to `ArrayVec`, which is always
+    effecient by @Thomasdezeeuw.
+  - Add method `remaining_capacity` by @Thomasdezeeuw
+  - Improve performance of the `extend` method.
+  - The index type of zero capacity vectors is now itself zero size, by
+    @clarfon
+  - Use `drop_in_place` for truncate and clear methods. This affects drop order
+    and resume from panic during drop.
+  - Use Rust 2018 edition for the implementation
+  - Require Rust 1.36 or later, for the unconditional `MaybeUninit`
+    improvements.
+
+- 0.4.11
+
+  - In Rust 1.36 or later, use newly stable `MaybeUninit`. This extends the
+    soundness work introduced in 0.4.9, we are finally able to use this in
+    stable. We use feature detection (build script) to enable this at build
+    time.
+
+- 0.4.10
+
+  - Use `repr(C)` in the `union` version that was introduced in 0.4.9, to
+    allay some soundness concerns.
+
+- 0.4.9
+
+  - Use `union` in the implementation on when this is detected to be supported
+    (nightly only for now). This is a better solution for treating uninitialized
+    regions correctly, and we'll use it in stable Rust as soon as we are able.
+    When this is enabled, the `ArrayVec` has no space overhead in its memory
+    layout, although the size of the vec should not be relied upon. (See [#114](https://github.com/bluss/arrayvec/pull/114))
+  - `ArrayString` updated to not use uninitialized memory, it instead zeros its
+    backing array. This will be refined in the next version, since we
+    need to make changes to the user visible API.
+  - The `use_union` feature now does nothing (like its documentation foretold).
+
+
+- 0.4.8
+
+  - Implement Clone and Debug for `IntoIter` by @clarcharr
+  - Add more array sizes under crate features. These cover all in the range
+    up to 128 and 129 to 255 respectively (we have a few of those by default):
+
+    - `array-size-33-128`
+    - `array-size-129-255`
+
+- 0.4.7
+
+  - Fix future compat warning about raw pointer casts
+  - Use `drop_in_place` when dropping the arrayvec by-value iterator
+  - Decrease mininum Rust version (see docs) by @jeehoonkang
+
+- 0.3.25
+
+  - Fix future compat warning about raw pointer casts
+
+- 0.4.6
+
+  - Fix compilation on 16-bit targets. This means, the 65536 array size is not
+    included on these targets.
+
+- 0.3.24
+
+  - Fix compilation on 16-bit targets. This means, the 65536 array size is not
+    included on these targets.
+  - Fix license files so that they are both included (was fixed in 0.4 before)
+
+- 0.4.5
+
+  - Add methods to `ArrayString` by @DenialAdams:
+
+    - `.pop() -> Option<char>`
+    - `.truncate(new_len)`
+    - `.remove(index) -> char`
+
+  - Remove dependency on crate odds
+  - Document debug assertions in unsafe methods better
+
+- 0.4.4
+
+  - Add method `ArrayVec::truncate()` by @niklasf
+
+- 0.4.3
+
+  - Improve performance for `ArrayVec::extend` with a lower level
+    implementation (#74)
+  - Small cleanup in dependencies (use no std for crates where we don't need more)
+
+- 0.4.2
+
+  - Add constructor method `new` to `CapacityError`.
+
+- 0.4.1
+
+  - Add `Default` impl to `ArrayString` by @tbu-
+
+- 0.4.0
+
+  - Reformed signatures and error handling by @bluss and @tbu-:
+
+    - `ArrayVec`'s `push, insert, remove, swap_remove` now match `Vec`'s
+      corresponding signature and panic on capacity errors where applicable.
+    - Add fallible methods `try_push, insert` and checked methods
+      `pop_at, swap_pop`.
+    - Similar changes to `ArrayString`'s push methods.
+
+  - Use a local version of the `RangeArgument` trait
+  - Add array sizes 50, 150, 200 by @daboross
+  - Support serde 1.0 by @daboross
+  - New method `.push_unchecked()` by @niklasf
+  - `ArrayString` implements `PartialOrd, Ord` by @tbu-
+  - Require Rust 1.14
+  - crate feature `use_generic_array` was dropped.
+
+- 0.3.23
+
+  - Implement `PartialOrd, Ord` as well as `PartialOrd<str>` for
+    `ArrayString`.
+
+- 0.3.22
+
+  - Implement `Array` for the 65536 size
+
+- 0.3.21
+
+  - Use `encode_utf8` from crate odds
+  - Add constructor `ArrayString::from_byte_string`
+
+- 0.3.20
+
+  - Simplify and speed up `ArrayString`’s `.push(char)`-
+
+- 0.3.19
+
+  - Add new crate feature `use_generic_array` which allows using their
+    `GenericArray` just like a regular fixed size array for the storage
+    of an `ArrayVec`.
+
+- 0.3.18
+
+  - Fix bounds check in `ArrayVec::insert`!
+    It would be buggy if `self.len() < index < self.capacity()`. Take note of
+    the push out behavior specified in the docs.
+
+- 0.3.17
+
+  - Added crate feature `use_union` which forwards to the nodrop crate feature
+  - Added methods `.is_full()` to `ArrayVec` and `ArrayString`.
+
+- 0.3.16
+
+  - Added method `.retain()` to `ArrayVec`.
+  - Added methods `.as_slice(), .as_mut_slice()` to `ArrayVec` and `.as_str()`
+    to `ArrayString`.
+
+- 0.3.15
+
+  - Add feature std, which you can opt out of to use `no_std` (requires Rust 1.6
+    to opt out).
+  - Implement `Clone::clone_from` for ArrayVec and ArrayString
+
+- 0.3.14
+
+  - Add `ArrayString::from(&str)`
+
+- 0.3.13
+
+  - Added `DerefMut` impl for `ArrayString`.
+  - Added method `.simplify()` to drop the element for `CapacityError`.
+  - Added method `.dispose()` to `ArrayVec`
+
+- 0.3.12
+
+  - Added ArrayString, a fixed capacity analogy of String
+
+- 0.3.11
+
+  - Added trait impls Default, PartialOrd, Ord, Write for ArrayVec
+
+- 0.3.10
+
+  - Go back to using external NoDrop, fixing a panic safety bug (issue #3)
+
+- 0.3.8
+
+  - Inline the non-dropping logic to remove one drop flag in the
+    ArrayVec representation.
+
+- 0.3.7
+
+  - Added method .into_inner()
+  - Added unsafe method .set_len()
diff --git a/vendor/arrayvec-0.5.2/Cargo.toml b/vendor/arrayvec-0.5.2/Cargo.toml
new file mode 100644
index 000000000..4fb37c1aa
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/Cargo.toml
@@ -0,0 +1,63 @@
+# 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 believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+edition = "2018"
+name = "arrayvec"
+version = "0.5.2"
+authors = ["bluss"]
+description = "A vector with fixed capacity, backed by an array (it can be stored on the stack too). Implements fixed capacity ArrayVec and ArrayString."
+documentation = "https://docs.rs/arrayvec/"
+keywords = ["stack", "vector", "array", "data-structure", "no_std"]
+categories = ["data-structures", "no-std"]
+license = "MIT/Apache-2.0"
+repository = "https://github.com/bluss/arrayvec"
+[package.metadata.docs.rs]
+features = ["serde"]
+
+[package.metadata.release]
+no-dev-version = true
+tag-name = "{{version}}"
+[profile.bench]
+debug = true
+
+[profile.release]
+debug = true
+
+[[bench]]
+name = "extend"
+harness = false
+
+[[bench]]
+name = "arraystring"
+harness = false
+[dependencies.serde]
+version = "1.0"
+optional = true
+default-features = false
+[dev-dependencies.bencher]
+version = "0.1.4"
+
+[dev-dependencies.matches]
+version = "0.1"
+
+[dev-dependencies.serde_test]
+version = "1.0"
+
+[build-dependencies]
+
+[features]
+array-sizes-129-255 = []
+array-sizes-33-128 = []
+default = ["std"]
+std = []
+unstable-const-fn = []
diff --git a/vendor/arrayvec-0.5.2/LICENSE-APACHE b/vendor/arrayvec-0.5.2/LICENSE-APACHE
new file mode 100644
index 000000000..16fe87b06
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/LICENSE-APACHE
@@ -0,0 +1,201 @@
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diff --git a/vendor/arrayvec-0.5.2/LICENSE-MIT b/vendor/arrayvec-0.5.2/LICENSE-MIT
new file mode 100644
index 000000000..2c8f27dba
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) Ulrik Sverdrup "bluss" 2015-2017
+
+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
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+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/arrayvec-0.5.2/README.md b/vendor/arrayvec-0.5.2/README.md
new file mode 100644
index 000000000..bfac3b325
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/README.md
@@ -0,0 +1,24 @@
+
+arrayvec
+========
+[![Crates.io: arrayvec](https://img.shields.io/crates/v/arrayvec.svg)](https://crates.io/crates/arrayvec)
+[![Crates.io: nodrop](https://img.shields.io/crates/v/nodrop.svg)](https://crates.io/crates/nodrop)
+[![Documentation](https://docs.rs/arrayvec/badge.svg)](https://docs.rs/arrayvec)
+[![Build Status](https://travis-ci.org/bluss/arrayvec.svg?branch=master)](https://travis-ci.org/bluss/arrayvec)
+[![License: Apache](https://img.shields.io/badge/License-Apache%202.0-red.svg)](LICENSE-APACHE)
+OR
+[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+
+A vector with fixed capacity.
+
+Please read the [`API documentation here`](https://docs.rs/arrayvec)
+
+# License
+
+Dual-licensed to be compatible with the Rust project.
+
+Licensed under the Apache License, Version 2.0
+http://www.apache.org/licenses/LICENSE-2.0 or the MIT license
+http://opensource.org/licenses/MIT, at your
+option. This file may not be copied, modified, or distributed
+except according to those terms.
diff --git a/vendor/arrayvec-0.5.2/benches/arraystring.rs b/vendor/arrayvec-0.5.2/benches/arraystring.rs
new file mode 100644
index 000000000..9cff5875d
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/benches/arraystring.rs
@@ -0,0 +1,90 @@
+
+extern crate arrayvec;
+#[macro_use] extern crate bencher;
+
+use arrayvec::ArrayString;
+
+use bencher::Bencher;
+
+fn try_push_c(b: &mut Bencher) {
+    let mut v = ArrayString::<[u8; 512]>::new();
+    b.iter(|| {
+        v.clear();
+        while v.try_push('c').is_ok() {
+        }
+        v.len()
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+fn try_push_alpha(b: &mut Bencher) {
+    let mut v = ArrayString::<[u8; 512]>::new();
+    b.iter(|| {
+        v.clear();
+        while v.try_push('α').is_ok() {
+        }
+        v.len()
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+// Yes, pushing a string char-by-char is slow. Use .push_str.
+fn try_push_string(b: &mut Bencher) {
+    let mut v = ArrayString::<[u8; 512]>::new();
+    let input = "abcαβγ“”";
+    b.iter(|| {
+        v.clear();
+        for ch in input.chars().cycle() {
+            if !v.try_push(ch).is_ok() {
+                break;
+            }
+        }
+        v.len()
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+fn push_c(b: &mut Bencher) {
+    let mut v = ArrayString::<[u8; 512]>::new();
+    b.iter(|| {
+        v.clear();
+        while !v.is_full() {
+            v.push('c');
+        }
+        v.len()
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+fn push_alpha(b: &mut Bencher) {
+    let mut v = ArrayString::<[u8; 512]>::new();
+    b.iter(|| {
+        v.clear();
+        while !v.is_full() {
+            v.push('α');
+        }
+        v.len()
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+fn push_string(b: &mut Bencher) {
+    let mut v = ArrayString::<[u8; 512]>::new();
+    let input = "abcαβγ“”";
+    b.iter(|| {
+        v.clear();
+        for ch in input.chars().cycle() {
+            if !v.is_full() {
+                v.push(ch);
+            } else {
+                break;
+            }
+        }
+        v.len()
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+benchmark_group!(benches, try_push_c, try_push_alpha, try_push_string, push_c,
+                 push_alpha, push_string);
+benchmark_main!(benches);
diff --git a/vendor/arrayvec-0.5.2/benches/extend.rs b/vendor/arrayvec-0.5.2/benches/extend.rs
new file mode 100644
index 000000000..057971769
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/benches/extend.rs
@@ -0,0 +1,78 @@
+
+extern crate arrayvec;
+#[macro_use] extern crate bencher;
+
+use std::io::Write;
+
+use arrayvec::ArrayVec;
+
+use bencher::Bencher;
+use bencher::black_box;
+
+fn extend_with_constant(b: &mut Bencher) {
+    let mut v = ArrayVec::<[u8; 512]>::new();
+    let cap = v.capacity();
+    b.iter(|| {
+        v.clear();
+        let constant = black_box(1);
+        v.extend((0..cap).map(move |_| constant));
+        v[511]
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+fn extend_with_range(b: &mut Bencher) {
+    let mut v = ArrayVec::<[u8; 512]>::new();
+    let cap = v.capacity();
+    b.iter(|| {
+        v.clear();
+        let range = 0..cap;
+        v.extend(range.map(|x| black_box(x as _)));
+        v[511]
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+fn extend_with_slice(b: &mut Bencher) {
+    let mut v = ArrayVec::<[u8; 512]>::new();
+    let data = [1; 512];
+    b.iter(|| {
+        v.clear();
+        let iter = data.iter().map(|&x| x);
+        v.extend(iter);
+        v[511]
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+fn extend_with_write(b: &mut Bencher) {
+    let mut v = ArrayVec::<[u8; 512]>::new();
+    let data = [1; 512];
+    b.iter(|| {
+        v.clear();
+        v.write(&data[..]).ok();
+        v[511]
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+fn extend_from_slice(b: &mut Bencher) {
+    let mut v = ArrayVec::<[u8; 512]>::new();
+    let data = [1; 512];
+    b.iter(|| {
+        v.clear();
+        v.try_extend_from_slice(&data).ok();
+        v[511]
+    });
+    b.bytes = v.capacity() as u64;
+}
+
+benchmark_group!(benches,
+                 extend_with_constant,
+                 extend_with_range,
+                 extend_with_slice,
+                 extend_with_write,
+                 extend_from_slice
+);
+
+benchmark_main!(benches);
diff --git a/vendor/arrayvec-0.5.2/ci/miri.sh b/vendor/arrayvec-0.5.2/ci/miri.sh
new file mode 100644
index 000000000..6b95c2d97
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/ci/miri.sh
@@ -0,0 +1,15 @@
+#!/usr/bin/env sh
+
+set -ex
+
+export CARGO_NET_RETRY=5
+export CARGO_NET_TIMEOUT=10
+
+MIRI_NIGHTLY=nightly-$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/miri)
+echo "Installing latest nightly with Miri: $MIRI_NIGHTLY"
+rustup default "$MIRI_NIGHTLY"
+
+rustup component add miri
+cargo miri setup
+
+cargo miri test
diff --git a/vendor/arrayvec-0.5.2/custom.css b/vendor/arrayvec-0.5.2/custom.css
new file mode 100644
index 000000000..8e0b7053e
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/custom.css
@@ -0,0 +1,25 @@
+
+.docblock pre.rust { background: #eeeeff; }
+pre.trait, pre.fn, pre.struct, pre.enum, pre.typedef { background: #fcfefc; }
+
+/* Small “example” label for doc examples */
+.docblock pre.rust::before {
+    content: "example";
+    float: right;
+    font-style: italic;
+    font-size: 0.8em;
+    margin-top: -10px;
+    margin-right: -5px;
+}
+
+
+/* Fixup where display in trait listing */
+pre.trait .where::before {
+content: '\a         ';
+}
+
+.docblock code {
+    background-color: inherit;
+    font-weight: bold;
+    padding: 0 0.1em;
+}
diff --git a/vendor/arrayvec-0.5.2/src/array.rs b/vendor/arrayvec-0.5.2/src/array.rs
new file mode 100644
index 000000000..2de5e77c7
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/src/array.rs
@@ -0,0 +1,151 @@
+
+/// Trait for fixed size arrays.
+///
+/// This trait is implemented for some specific array sizes, see
+/// the implementor list below. At the current state of Rust we can't
+/// make this fully general for every array size.
+///
+/// The following crate features add more array sizes (and they are not
+/// enabled by default due to their impact on compliation speed).
+///
+/// - `array-sizes-33-128`: All sizes 33 to 128 are implemented
+///   (a few in this range are included by default).
+/// - `array-sizes-129-255`: All sizes 129 to 255 are implemented
+///   (a few in this range are included by default).
+///
+/// ## Safety
+///
+/// This trait can *only* be implemented by fixed-size arrays or types with
+/// *exactly* the representation of a fixed size array (of the right element
+/// type and capacity).
+///
+/// Normally this trait is an implementation detail of arrayvec and doesn’t
+/// need implementing.
+pub unsafe trait Array {
+    /// The array’s element type
+    type Item;
+    /// The smallest type that can index and tell the length of the array.
+    #[doc(hidden)]
+    type Index: Index;
+    /// The array's element capacity
+    const CAPACITY: usize;
+    fn as_slice(&self) -> &[Self::Item];
+    fn as_mut_slice(&mut self) -> &mut [Self::Item];
+}
+
+pub trait Index : PartialEq + Copy {
+    const ZERO: Self;
+    fn to_usize(self) -> usize;
+    fn from(_: usize) -> Self;
+}
+
+impl Index for () {
+    const ZERO: Self = ();
+    #[inline(always)]
+    fn to_usize(self) -> usize { 0 }
+    #[inline(always)]
+    fn from(_ix: usize) ->  Self { () }
+}
+
+impl Index for bool {
+    const ZERO: Self = false;
+    #[inline(always)]
+    fn to_usize(self) -> usize { self as usize }
+    #[inline(always)]
+    fn from(ix: usize) ->  Self { ix != 0 }
+}
+
+impl Index for u8 {
+    const ZERO: Self = 0;
+    #[inline(always)]
+    fn to_usize(self) -> usize { self as usize }
+    #[inline(always)]
+    fn from(ix: usize) ->  Self { ix as u8 }
+}
+
+impl Index for u16 {
+    const ZERO: Self = 0;
+    #[inline(always)]
+    fn to_usize(self) -> usize { self as usize }
+    #[inline(always)]
+    fn from(ix: usize) ->  Self { ix as u16 }
+}
+
+impl Index for u32 {
+    const ZERO: Self = 0;
+    #[inline(always)]
+    fn to_usize(self) -> usize { self as usize }
+    #[inline(always)]
+    fn from(ix: usize) ->  Self { ix as u32 }
+}
+
+impl Index for usize {
+    const ZERO: Self = 0;
+    #[inline(always)]
+    fn to_usize(self) -> usize { self }
+    #[inline(always)]
+    fn from(ix: usize) ->  Self { ix }
+}
+
+macro_rules! fix_array_impl {
+    ($index_type:ty, $len:expr ) => (
+        unsafe impl<T> Array for [T; $len] {
+            type Item = T;
+            type Index = $index_type;
+            const CAPACITY: usize = $len;
+            #[doc(hidden)]
+            fn as_slice(&self) -> &[Self::Item] { self }
+            #[doc(hidden)]
+            fn as_mut_slice(&mut self) -> &mut [Self::Item] { self }
+        }
+    )
+}
+
+macro_rules! fix_array_impl_recursive {
+    ($index_type:ty, ) => ();
+    ($index_type:ty, $($len:expr,)*) => (
+        $(fix_array_impl!($index_type, $len);)*
+    );
+}
+
+
+fix_array_impl_recursive!((), 0,);
+fix_array_impl_recursive!(bool, 1,);
+fix_array_impl_recursive!(u8, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+                          15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
+                          28, 29, 30, 31, );
+
+#[cfg(not(feature="array-sizes-33-128"))]
+fix_array_impl_recursive!(u8, 32, 40, 48, 50, 56, 64, 72, 96, 100, 128, );
+
+#[cfg(feature="array-sizes-33-128")]
+fix_array_impl_recursive!(u8, 
+32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
+52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
+72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
+92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108,
+109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124,
+125, 126, 127, 128,
+);
+
+#[cfg(not(feature="array-sizes-129-255"))]
+fix_array_impl_recursive!(u8, 160, 192, 200, 224,);
+
+#[cfg(feature="array-sizes-129-255")]
+fix_array_impl_recursive!(u8,
+129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140,
+141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156,
+157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172,
+173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188,
+189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204,
+205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220,
+221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236,
+237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252,
+253, 254, 255,
+);
+
+fix_array_impl_recursive!(u16, 256, 384, 512, 768, 1024, 2048, 4096, 8192, 16384, 32768,);
+// This array size doesn't exist on 16-bit
+#[cfg(any(target_pointer_width="32", target_pointer_width="64"))]
+fix_array_impl_recursive!(u32, 1 << 16,);
+
diff --git a/vendor/arrayvec-0.5.2/src/array_string.rs b/vendor/arrayvec-0.5.2/src/array_string.rs
new file mode 100644
index 000000000..1aae59ea7
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/src/array_string.rs
@@ -0,0 +1,582 @@
+use std::borrow::Borrow;
+use std::cmp;
+use std::fmt;
+use std::hash::{Hash, Hasher};
+use std::ptr;
+use std::ops::{Deref, DerefMut};
+use std::str;
+use std::str::FromStr;
+use std::str::Utf8Error;
+use std::slice;
+
+use crate::array::Array;
+use crate::array::Index;
+use crate::CapacityError;
+use crate::char::encode_utf8;
+
+#[cfg(feature="serde")]
+use serde::{Serialize, Deserialize, Serializer, Deserializer};
+
+use super::MaybeUninit as MaybeUninitCopy;
+
+/// A string with a fixed capacity.
+///
+/// The `ArrayString` is a string backed by a fixed size array. It keeps track
+/// of its length.
+///
+/// The string is a contiguous value that you can store directly on the stack
+/// if needed.
+#[derive(Copy)]
+pub struct ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    xs: MaybeUninitCopy<A>,
+    len: A::Index,
+}
+
+impl<A> Default for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    /// Return an empty `ArrayString`
+    fn default() -> ArrayString<A> {
+        ArrayString::new()
+    }
+}
+
+impl<A> ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    /// Create a new empty `ArrayString`.
+    ///
+    /// Capacity is inferred from the type parameter.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let mut string = ArrayString::<[_; 16]>::new();
+    /// string.push_str("foo");
+    /// assert_eq!(&string[..], "foo");
+    /// assert_eq!(string.capacity(), 16);
+    /// ```
+    #[cfg(not(feature="unstable-const-fn"))]
+    pub fn new() -> ArrayString<A> {
+        unsafe {
+            ArrayString {
+                xs: MaybeUninitCopy::uninitialized(),
+                len: Index::ZERO,
+            }
+        }
+    }
+
+    #[cfg(feature="unstable-const-fn")]
+    pub const fn new() -> ArrayString<A> {
+        unsafe {
+            ArrayString {
+                xs: MaybeUninitCopy::uninitialized(),
+                len: Index::ZERO,
+            }
+        }
+    }
+
+    /// Return the length of the string.
+    #[inline]
+    pub fn len(&self) -> usize { self.len.to_usize() }
+
+    /// Returns whether the string is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool { self.len() == 0 }
+
+    /// Create a new `ArrayString` from a `str`.
+    ///
+    /// Capacity is inferred from the type parameter.
+    ///
+    /// **Errors** if the backing array is not large enough to fit the string.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let mut string = ArrayString::<[_; 3]>::from("foo").unwrap();
+    /// assert_eq!(&string[..], "foo");
+    /// assert_eq!(string.len(), 3);
+    /// assert_eq!(string.capacity(), 3);
+    /// ```
+    pub fn from(s: &str) -> Result<Self, CapacityError<&str>> {
+        let mut arraystr = Self::new();
+        arraystr.try_push_str(s)?;
+        Ok(arraystr)
+    }
+
+    /// Create a new `ArrayString` from a byte string literal.
+    ///
+    /// **Errors** if the byte string literal is not valid UTF-8.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let string = ArrayString::from_byte_string(b"hello world").unwrap();
+    /// ```
+    pub fn from_byte_string(b: &A) -> Result<Self, Utf8Error> {
+        let len = str::from_utf8(b.as_slice())?.len();
+        debug_assert_eq!(len, A::CAPACITY);
+        Ok(ArrayString {
+            xs: MaybeUninitCopy::from(*b),
+            len: Index::from(A::CAPACITY),
+        })
+    }
+
+    /// Return the capacity of the `ArrayString`.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let string = ArrayString::<[_; 3]>::new();
+    /// assert_eq!(string.capacity(), 3);
+    /// ```
+    #[inline(always)]
+    pub fn capacity(&self) -> usize { A::CAPACITY }
+
+    /// Return if the `ArrayString` is completely filled.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let mut string = ArrayString::<[_; 1]>::new();
+    /// assert!(!string.is_full());
+    /// string.push_str("A");
+    /// assert!(string.is_full());
+    /// ```
+    pub fn is_full(&self) -> bool { self.len() == self.capacity() }
+
+    /// Adds the given char to the end of the string.
+    ///
+    /// ***Panics*** if the backing array is not large enough to fit the additional char.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let mut string = ArrayString::<[_; 2]>::new();
+    ///
+    /// string.push('a');
+    /// string.push('b');
+    ///
+    /// assert_eq!(&string[..], "ab");
+    /// ```
+    pub fn push(&mut self, c: char) {
+        self.try_push(c).unwrap();
+    }
+
+    /// Adds the given char to the end of the string.
+    ///
+    /// Returns `Ok` if the push succeeds.
+    ///
+    /// **Errors** if the backing array is not large enough to fit the additional char.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let mut string = ArrayString::<[_; 2]>::new();
+    ///
+    /// string.try_push('a').unwrap();
+    /// string.try_push('b').unwrap();
+    /// let overflow = string.try_push('c');
+    ///
+    /// assert_eq!(&string[..], "ab");
+    /// assert_eq!(overflow.unwrap_err().element(), 'c');
+    /// ```
+    pub fn try_push(&mut self, c: char) -> Result<(), CapacityError<char>> {
+        let len = self.len();
+        unsafe {
+            let ptr = self.xs.ptr_mut().add(len);
+            let remaining_cap = self.capacity() - len;
+            match encode_utf8(c, ptr, remaining_cap) {
+                Ok(n) => {
+                    self.set_len(len + n);
+                    Ok(())
+                }
+                Err(_) => Err(CapacityError::new(c)),
+            }
+        }
+    }
+
+    /// Adds the given string slice to the end of the string.
+    ///
+    /// ***Panics*** if the backing array is not large enough to fit the string.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let mut string = ArrayString::<[_; 2]>::new();
+    ///
+    /// string.push_str("a");
+    /// string.push_str("d");
+    ///
+    /// assert_eq!(&string[..], "ad");
+    /// ```
+    pub fn push_str(&mut self, s: &str) {
+        self.try_push_str(s).unwrap()
+    }
+
+    /// Adds the given string slice to the end of the string.
+    ///
+    /// Returns `Ok` if the push succeeds.
+    ///
+    /// **Errors** if the backing array is not large enough to fit the string.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let mut string = ArrayString::<[_; 2]>::new();
+    ///
+    /// string.try_push_str("a").unwrap();
+    /// let overflow1 = string.try_push_str("bc");
+    /// string.try_push_str("d").unwrap();
+    /// let overflow2 = string.try_push_str("ef");
+    ///
+    /// assert_eq!(&string[..], "ad");
+    /// assert_eq!(overflow1.unwrap_err().element(), "bc");
+    /// assert_eq!(overflow2.unwrap_err().element(), "ef");
+    /// ```
+    pub fn try_push_str<'a>(&mut self, s: &'a str) -> Result<(), CapacityError<&'a str>> {
+        if s.len() > self.capacity() - self.len() {
+            return Err(CapacityError::new(s));
+        }
+        unsafe {
+            let dst = self.xs.ptr_mut().add(self.len());
+            let src = s.as_ptr();
+            ptr::copy_nonoverlapping(src, dst, s.len());
+            let newl = self.len() + s.len();
+            self.set_len(newl);
+        }
+        Ok(())
+    }
+
+    /// Removes the last character from the string and returns it.
+    ///
+    /// Returns `None` if this `ArrayString` is empty.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    /// 
+    /// let mut s = ArrayString::<[_; 3]>::from("foo").unwrap();
+    ///
+    /// assert_eq!(s.pop(), Some('o'));
+    /// assert_eq!(s.pop(), Some('o'));
+    /// assert_eq!(s.pop(), Some('f'));
+    ///
+    /// assert_eq!(s.pop(), None);
+    /// ```
+    pub fn pop(&mut self) -> Option<char> {
+        let ch = match self.chars().rev().next() {
+            Some(ch) => ch,
+            None => return None,
+        };
+        let new_len = self.len() - ch.len_utf8();
+        unsafe {
+            self.set_len(new_len);
+        }
+        Some(ch)
+    }
+
+    /// Shortens this `ArrayString` to the specified length.
+    ///
+    /// If `new_len` is greater than the string’s current length, this has no
+    /// effect.
+    ///
+    /// ***Panics*** if `new_len` does not lie on a `char` boundary.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    ///
+    /// let mut string = ArrayString::<[_; 6]>::from("foobar").unwrap();
+    /// string.truncate(3);
+    /// assert_eq!(&string[..], "foo");
+    /// string.truncate(4);
+    /// assert_eq!(&string[..], "foo");
+    /// ```
+    pub fn truncate(&mut self, new_len: usize) {
+        if new_len <= self.len() {
+            assert!(self.is_char_boundary(new_len));
+            unsafe { 
+                // In libstd truncate is called on the underlying vector,
+                // which in turns drops each element.
+                // As we know we don't have to worry about Drop,
+                // we can just set the length (a la clear.)
+                self.set_len(new_len);
+            }
+        }
+    }
+
+    /// Removes a `char` from this `ArrayString` at a byte position and returns it.
+    ///
+    /// This is an `O(n)` operation, as it requires copying every element in the
+    /// array.
+    ///
+    /// ***Panics*** if `idx` is larger than or equal to the `ArrayString`’s length,
+    /// or if it does not lie on a `char` boundary.
+    ///
+    /// ```
+    /// use arrayvec::ArrayString;
+    /// 
+    /// let mut s = ArrayString::<[_; 3]>::from("foo").unwrap();
+    ///
+    /// assert_eq!(s.remove(0), 'f');
+    /// assert_eq!(s.remove(1), 'o');
+    /// assert_eq!(s.remove(0), 'o');
+    /// ```
+    pub fn remove(&mut self, idx: usize) -> char {
+        let ch = match self[idx..].chars().next() {
+            Some(ch) => ch,
+            None => panic!("cannot remove a char from the end of a string"),
+        };
+
+        let next = idx + ch.len_utf8();
+        let len = self.len();
+        unsafe {
+            ptr::copy(self.xs.ptr().add(next),
+                      self.xs.ptr_mut().add(idx),
+                      len - next);
+            self.set_len(len - (next - idx));
+        }
+        ch
+    }
+
+    /// Make the string empty.
+    pub fn clear(&mut self) {
+        unsafe {
+            self.set_len(0);
+        }
+    }
+
+    /// Set the strings’s length.
+    ///
+    /// This function is `unsafe` because it changes the notion of the
+    /// number of “valid” bytes in the string. Use with care.
+    ///
+    /// This method uses *debug assertions* to check the validity of `length`
+    /// and may use other debug assertions.
+    pub unsafe fn set_len(&mut self, length: usize) {
+        debug_assert!(length <= self.capacity());
+        self.len = Index::from(length);
+    }
+
+    /// Return a string slice of the whole `ArrayString`.
+    pub fn as_str(&self) -> &str {
+        self
+    }
+}
+
+impl<A> Deref for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    type Target = str;
+    #[inline]
+    fn deref(&self) -> &str {
+        unsafe {
+            let sl = slice::from_raw_parts(self.xs.ptr(), self.len.to_usize());
+            str::from_utf8_unchecked(sl)
+        }
+    }
+}
+
+impl<A> DerefMut for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    #[inline]
+    fn deref_mut(&mut self) -> &mut str {
+        unsafe {
+            let sl = slice::from_raw_parts_mut(self.xs.ptr_mut(), self.len.to_usize());
+            str::from_utf8_unchecked_mut(sl)
+        }
+    }
+}
+
+impl<A> PartialEq for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn eq(&self, rhs: &Self) -> bool {
+        **self == **rhs
+    }
+}
+
+impl<A> PartialEq<str> for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn eq(&self, rhs: &str) -> bool {
+        &**self == rhs
+    }
+}
+
+impl<A> PartialEq<ArrayString<A>> for str
+    where A: Array<Item=u8> + Copy
+{
+    fn eq(&self, rhs: &ArrayString<A>) -> bool {
+        self == &**rhs
+    }
+}
+
+impl<A> Eq for ArrayString<A> 
+    where A: Array<Item=u8> + Copy
+{ }
+
+impl<A> Hash for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn hash<H: Hasher>(&self, h: &mut H) {
+        (**self).hash(h)
+    }
+}
+
+impl<A> Borrow<str> for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn borrow(&self) -> &str { self }
+}
+
+impl<A> AsRef<str> for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn as_ref(&self) -> &str { self }
+}
+
+impl<A> fmt::Debug for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { (**self).fmt(f) }
+}
+
+impl<A> fmt::Display for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { (**self).fmt(f) }
+}
+
+/// `Write` appends written data to the end of the string.
+impl<A> fmt::Write for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn write_char(&mut self, c: char) -> fmt::Result {
+        self.try_push(c).map_err(|_| fmt::Error)
+    }
+
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        self.try_push_str(s).map_err(|_| fmt::Error)
+    }
+}
+
+impl<A> Clone for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn clone(&self) -> ArrayString<A> {
+        *self
+    }
+    fn clone_from(&mut self, rhs: &Self) {
+        // guaranteed to fit due to types matching.
+        self.clear();
+        self.try_push_str(rhs).ok();
+    }
+}
+
+impl<A> PartialOrd for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn partial_cmp(&self, rhs: &Self) -> Option<cmp::Ordering> {
+        (**self).partial_cmp(&**rhs)
+    }
+    fn lt(&self, rhs: &Self) -> bool { **self < **rhs }
+    fn le(&self, rhs: &Self) -> bool { **self <= **rhs }
+    fn gt(&self, rhs: &Self) -> bool { **self > **rhs }
+    fn ge(&self, rhs: &Self) -> bool { **self >= **rhs }
+}
+
+impl<A> PartialOrd<str> for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn partial_cmp(&self, rhs: &str) -> Option<cmp::Ordering> {
+        (**self).partial_cmp(rhs)
+    }
+    fn lt(&self, rhs: &str) -> bool { &**self < rhs }
+    fn le(&self, rhs: &str) -> bool { &**self <= rhs }
+    fn gt(&self, rhs: &str) -> bool { &**self > rhs }
+    fn ge(&self, rhs: &str) -> bool { &**self >= rhs }
+}
+
+impl<A> PartialOrd<ArrayString<A>> for str
+    where A: Array<Item=u8> + Copy
+{
+    fn partial_cmp(&self, rhs: &ArrayString<A>) -> Option<cmp::Ordering> {
+        self.partial_cmp(&**rhs)
+    }
+    fn lt(&self, rhs: &ArrayString<A>) -> bool { self < &**rhs }
+    fn le(&self, rhs: &ArrayString<A>) -> bool { self <= &**rhs }
+    fn gt(&self, rhs: &ArrayString<A>) -> bool { self > &**rhs }
+    fn ge(&self, rhs: &ArrayString<A>) -> bool { self >= &**rhs }
+}
+
+impl<A> Ord for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn cmp(&self, rhs: &Self) -> cmp::Ordering {
+        (**self).cmp(&**rhs)
+    }
+}
+
+impl<A> FromStr for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    type Err = CapacityError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Self::from(s).map_err(CapacityError::simplify)
+    }
+}
+
+#[cfg(feature="serde")]
+/// Requires crate feature `"serde"`
+impl<A> Serialize for ArrayString<A>
+    where A: Array<Item=u8> + Copy
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
+        serializer.serialize_str(&*self)
+    }
+}
+
+#[cfg(feature="serde")]
+/// Requires crate feature `"serde"`
+impl<'de, A> Deserialize<'de> for ArrayString<A> 
+    where A: Array<Item=u8> + Copy
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+        where D: Deserializer<'de>
+    {
+        use serde::de::{self, Visitor};
+        use std::marker::PhantomData;
+
+        struct ArrayStringVisitor<A: Array<Item=u8>>(PhantomData<A>);
+
+        impl<'de, A: Copy + Array<Item=u8>> Visitor<'de> for ArrayStringVisitor<A> {
+            type Value = ArrayString<A>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                write!(formatter, "a string no more than {} bytes long", A::CAPACITY)
+            }
+
+            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+                where E: de::Error,
+            {
+                ArrayString::from(v).map_err(|_| E::invalid_length(v.len(), &self))
+            }
+
+            fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+                where E: de::Error,
+            {
+                let s = str::from_utf8(v).map_err(|_| E::invalid_value(de::Unexpected::Bytes(v), &self))?;
+
+                ArrayString::from(s).map_err(|_| E::invalid_length(s.len(), &self))
+            }
+        }
+
+        deserializer.deserialize_str(ArrayStringVisitor::<A>(PhantomData))
+    }
+}
diff --git a/vendor/arrayvec-0.5.2/src/char.rs b/vendor/arrayvec-0.5.2/src/char.rs
new file mode 100644
index 000000000..03d64fcd4
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/src/char.rs
@@ -0,0 +1,99 @@
+// Copyright 2012-2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// 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.
+//
+// Original authors: alexchrichton, bluss
+
+use std::ptr;
+
+// UTF-8 ranges and tags for encoding characters
+const TAG_CONT: u8    = 0b1000_0000;
+const TAG_TWO_B: u8   = 0b1100_0000;
+const TAG_THREE_B: u8 = 0b1110_0000;
+const TAG_FOUR_B: u8  = 0b1111_0000;
+const MAX_ONE_B: u32   =     0x80;
+const MAX_TWO_B: u32   =    0x800;
+const MAX_THREE_B: u32 =  0x10000;
+
+/// Placeholder
+pub struct EncodeUtf8Error;
+
+#[inline]
+unsafe fn write(ptr: *mut u8, index: usize, byte: u8) {
+    ptr::write(ptr.add(index), byte)
+}
+
+/// Encode a char into buf using UTF-8.
+///
+/// On success, return the byte length of the encoding (1, 2, 3 or 4).<br>
+/// On error, return `EncodeUtf8Error` if the buffer was too short for the char.
+///
+/// Safety: `ptr` must be writable for `len` bytes.
+#[inline]
+pub unsafe fn encode_utf8(ch: char, ptr: *mut u8, len: usize) -> Result<usize, EncodeUtf8Error>
+{
+    let code = ch as u32;
+    if code < MAX_ONE_B && len >= 1 {
+        write(ptr, 0, code as u8);
+        return Ok(1);
+    } else if code < MAX_TWO_B && len >= 2 {
+        write(ptr, 0, (code >> 6 & 0x1F) as u8 | TAG_TWO_B);
+        write(ptr, 1, (code & 0x3F) as u8 | TAG_CONT);
+        return Ok(2);
+    } else if code < MAX_THREE_B && len >= 3 {
+        write(ptr, 0, (code >> 12 & 0x0F) as u8 | TAG_THREE_B);
+        write(ptr, 1, (code >>  6 & 0x3F) as u8 | TAG_CONT);
+        write(ptr, 2, (code & 0x3F) as u8 | TAG_CONT);
+        return Ok(3);
+    } else if len >= 4 {
+        write(ptr, 0, (code >> 18 & 0x07) as u8 | TAG_FOUR_B);
+        write(ptr, 1, (code >> 12 & 0x3F) as u8 | TAG_CONT);
+        write(ptr, 2, (code >>  6 & 0x3F) as u8 | TAG_CONT);
+        write(ptr, 3, (code & 0x3F) as u8 | TAG_CONT);
+        return Ok(4);
+    };
+    Err(EncodeUtf8Error)
+}
+
+
+#[test]
+#[cfg_attr(miri, ignore)] // Miri is too slow
+fn test_encode_utf8() {
+    // Test that all codepoints are encoded correctly
+    let mut data = [0u8; 16];
+    for codepoint in 0..=(std::char::MAX as u32) {
+        if let Some(ch) = std::char::from_u32(codepoint) {
+            for elt in &mut data { *elt = 0; }
+            let ptr = data.as_mut_ptr();
+            let len = data.len();
+            unsafe {
+                let res = encode_utf8(ch, ptr, len).ok().unwrap();
+                assert_eq!(res, ch.len_utf8());
+            }
+            let string = std::str::from_utf8(&data).unwrap();
+            assert_eq!(string.chars().next(), Some(ch));
+        }
+    }
+}
+
+#[test]
+fn test_encode_utf8_oob() {
+    // test that we report oob if the buffer is too short
+    let mut data = [0u8; 16];
+    let chars = ['a', 'α', '�', '𐍈'];
+    for (len, &ch) in (1..=4).zip(&chars) {
+        assert_eq!(len, ch.len_utf8(), "Len of ch={}", ch);
+        let ptr = data.as_mut_ptr();
+        unsafe {
+            assert!(matches::matches!(encode_utf8(ch, ptr, len - 1), Err(_)));
+            assert!(matches::matches!(encode_utf8(ch, ptr, len), Ok(_)));
+        }
+    }
+}
+
diff --git a/vendor/arrayvec-0.5.2/src/errors.rs b/vendor/arrayvec-0.5.2/src/errors.rs
new file mode 100644
index 000000000..380742a80
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/src/errors.rs
@@ -0,0 +1,49 @@
+use std::fmt;
+#[cfg(feature="std")]
+use std::any::Any;
+#[cfg(feature="std")]
+use std::error::Error;
+
+/// Error value indicating insufficient capacity
+#[derive(Clone, Copy, Eq, Ord, PartialEq, PartialOrd)]
+pub struct CapacityError<T = ()> {
+    element: T,
+}
+
+impl<T> CapacityError<T> {
+    /// Create a new `CapacityError` from `element`.
+    pub fn new(element: T) -> CapacityError<T> {
+        CapacityError {
+            element: element,
+        }
+    }
+
+    /// Extract the overflowing element
+    pub fn element(self) -> T {
+        self.element
+    }
+
+    /// Convert into a `CapacityError` that does not carry an element.
+    pub fn simplify(self) -> CapacityError {
+        CapacityError { element: () }
+    }
+}
+
+const CAPERROR: &'static str = "insufficient capacity";
+
+#[cfg(feature="std")]
+/// Requires `features="std"`.
+impl<T: Any> Error for CapacityError<T> {}
+
+impl<T> fmt::Display for CapacityError<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", CAPERROR)
+    }
+}
+
+impl<T> fmt::Debug for CapacityError<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}: {}", "CapacityError", CAPERROR)
+    }
+}
+
diff --git a/vendor/arrayvec-0.5.2/src/lib.rs b/vendor/arrayvec-0.5.2/src/lib.rs
new file mode 100644
index 000000000..a5d6c0606
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/src/lib.rs
@@ -0,0 +1,1213 @@
+//! **arrayvec** provides the types `ArrayVec` and `ArrayString`: 
+//! array-backed vector and string types, which store their contents inline.
+//!
+//! The arrayvec package has the following cargo features:
+//!
+//! - `std`
+//!   - Optional, enabled by default
+//!   - Use libstd; disable to use `no_std` instead.
+//!
+//! - `serde`
+//!   - Optional
+//!   - Enable serialization for ArrayVec and ArrayString using serde 1.x
+//! - `array-sizes-33-128`, `array-sizes-129-255`
+//!   - Optional
+//!   - Enable more array sizes (see [Array] for more information)
+//!
+//! - `unstable-const-fn`
+//!   - Optional
+//!   - Makes [`ArrayVec::new`] and [`ArrayString::new`] `const fn`s,
+//!     using the nightly `const_fn` feature.
+//!   - Unstable and requires nightly.
+//!
+//! ## Rust Version
+//!
+//! This version of arrayvec requires Rust 1.36 or later.
+//!
+#![doc(html_root_url="https://docs.rs/arrayvec/0.4/")]
+#![cfg_attr(not(feature="std"), no_std)]
+#![cfg_attr(feature="unstable-const-fn", feature(const_fn))]
+
+#[cfg(feature="serde")]
+extern crate serde;
+
+#[cfg(not(feature="std"))]
+extern crate core as std;
+
+use std::cmp;
+use std::iter;
+use std::mem;
+use std::ops::{Bound, Deref, DerefMut, RangeBounds};
+use std::ptr;
+use std::slice;
+
+// extra traits
+use std::borrow::{Borrow, BorrowMut};
+use std::hash::{Hash, Hasher};
+use std::fmt;
+
+#[cfg(feature="std")]
+use std::io;
+
+
+mod maybe_uninit;
+use crate::maybe_uninit::MaybeUninit;
+
+#[cfg(feature="serde")]
+use serde::{Serialize, Deserialize, Serializer, Deserializer};
+
+mod array;
+mod array_string;
+mod char;
+mod errors;
+
+pub use crate::array::Array;
+use crate::array::Index;
+pub use crate::array_string::ArrayString;
+pub use crate::errors::CapacityError;
+
+
+/// A vector with a fixed capacity.
+///
+/// The `ArrayVec` is a vector backed by a fixed size array. It keeps track of
+/// the number of initialized elements.
+///
+/// The vector is a contiguous value that you can store directly on the stack
+/// if needed.
+///
+/// It offers a simple API but also dereferences to a slice, so
+/// that the full slice API is available.
+///
+/// ArrayVec can be converted into a by value iterator.
+pub struct ArrayVec<A: Array> {
+    xs: MaybeUninit<A>,
+    len: A::Index,
+}
+
+impl<A: Array> Drop for ArrayVec<A> {
+    fn drop(&mut self) {
+        self.clear();
+
+        // MaybeUninit inhibits array's drop
+    }
+}
+
+macro_rules! panic_oob {
+    ($method_name:expr, $index:expr, $len:expr) => {
+        panic!(concat!("ArrayVec::", $method_name, ": index {} is out of bounds in vector of length {}"),
+               $index, $len)
+    }
+}
+
+impl<A: Array> ArrayVec<A> {
+    /// Create a new empty `ArrayVec`.
+    ///
+    /// Capacity is inferred from the type parameter.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::<[_; 16]>::new();
+    /// array.push(1);
+    /// array.push(2);
+    /// assert_eq!(&array[..], &[1, 2]);
+    /// assert_eq!(array.capacity(), 16);
+    /// ```
+    #[cfg(not(feature="unstable-const-fn"))]
+    pub fn new() -> ArrayVec<A> {
+        unsafe {
+            ArrayVec { xs: MaybeUninit::uninitialized(), len: Index::ZERO }
+        }
+    }
+
+    #[cfg(feature="unstable-const-fn")]
+    pub const fn new() -> ArrayVec<A> {
+        unsafe {
+            ArrayVec { xs: MaybeUninit::uninitialized(), len: Index::ZERO }
+        }
+    }
+
+    /// Return the number of elements in the `ArrayVec`.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1, 2, 3]);
+    /// array.pop();
+    /// assert_eq!(array.len(), 2);
+    /// ```
+    #[inline]
+    pub fn len(&self) -> usize { self.len.to_usize() }
+
+    /// Returns whether the `ArrayVec` is empty.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1]);
+    /// array.pop();
+    /// assert_eq!(array.is_empty(), true);
+    /// ```
+    #[inline]
+    pub fn is_empty(&self) -> bool { self.len() == 0 }
+
+    /// Return the capacity of the `ArrayVec`.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let array = ArrayVec::from([1, 2, 3]);
+    /// assert_eq!(array.capacity(), 3);
+    /// ```
+    #[inline(always)]
+    pub fn capacity(&self) -> usize { A::CAPACITY }
+
+    /// Return if the `ArrayVec` is completely filled.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::<[_; 1]>::new();
+    /// assert!(!array.is_full());
+    /// array.push(1);
+    /// assert!(array.is_full());
+    /// ```
+    pub fn is_full(&self) -> bool { self.len() == self.capacity() }
+
+    /// Returns the capacity left in the `ArrayVec`.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1, 2, 3]);
+    /// array.pop();
+    /// assert_eq!(array.remaining_capacity(), 1);
+    /// ```
+    pub fn remaining_capacity(&self) -> usize {
+        self.capacity() - self.len()
+    }
+
+    /// Push `element` to the end of the vector.
+    ///
+    /// ***Panics*** if the vector is already full.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::<[_; 2]>::new();
+    ///
+    /// array.push(1);
+    /// array.push(2);
+    ///
+    /// assert_eq!(&array[..], &[1, 2]);
+    /// ```
+    pub fn push(&mut self, element: A::Item) {
+        self.try_push(element).unwrap()
+    }
+
+    /// Push `element` to the end of the vector.
+    ///
+    /// Return `Ok` if the push succeeds, or return an error if the vector
+    /// is already full.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::<[_; 2]>::new();
+    ///
+    /// let push1 = array.try_push(1);
+    /// let push2 = array.try_push(2);
+    ///
+    /// assert!(push1.is_ok());
+    /// assert!(push2.is_ok());
+    ///
+    /// assert_eq!(&array[..], &[1, 2]);
+    ///
+    /// let overflow = array.try_push(3);
+    ///
+    /// assert!(overflow.is_err());
+    /// ```
+    pub fn try_push(&mut self, element: A::Item) -> Result<(), CapacityError<A::Item>> {
+        if self.len() < A::CAPACITY {
+            unsafe {
+                self.push_unchecked(element);
+            }
+            Ok(())
+        } else {
+            Err(CapacityError::new(element))
+        }
+    }
+
+
+    /// Push `element` to the end of the vector without checking the capacity.
+    ///
+    /// It is up to the caller to ensure the capacity of the vector is
+    /// sufficiently large.
+    ///
+    /// This method uses *debug assertions* to check that the arrayvec is not full.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::<[_; 2]>::new();
+    ///
+    /// if array.len() + 2 <= array.capacity() {
+    ///     unsafe {
+    ///         array.push_unchecked(1);
+    ///         array.push_unchecked(2);
+    ///     }
+    /// }
+    ///
+    /// assert_eq!(&array[..], &[1, 2]);
+    /// ```
+    pub unsafe fn push_unchecked(&mut self, element: A::Item) {
+        let len = self.len();
+        debug_assert!(len < A::CAPACITY);
+        ptr::write(self.get_unchecked_ptr(len), element);
+        self.set_len(len + 1);
+    }
+
+    /// Get pointer to where element at `index` would be
+    unsafe fn get_unchecked_ptr(&mut self, index: usize) -> *mut A::Item {
+        self.xs.ptr_mut().add(index)
+    }
+
+    /// Insert `element` at position `index`.
+    ///
+    /// Shift up all elements after `index`.
+    ///
+    /// It is an error if the index is greater than the length or if the
+    /// arrayvec is full.
+    ///
+    /// ***Panics*** if the array is full or the `index` is out of bounds. See
+    /// `try_insert` for fallible version.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::<[_; 2]>::new();
+    ///
+    /// array.insert(0, "x");
+    /// array.insert(0, "y");
+    /// assert_eq!(&array[..], &["y", "x"]);
+    ///
+    /// ```
+    pub fn insert(&mut self, index: usize, element: A::Item) {
+        self.try_insert(index, element).unwrap()
+    }
+
+    /// Insert `element` at position `index`.
+    ///
+    /// Shift up all elements after `index`; the `index` must be less than
+    /// or equal to the length.
+    ///
+    /// Returns an error if vector is already at full capacity.
+    ///
+    /// ***Panics*** `index` is out of bounds.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::<[_; 2]>::new();
+    ///
+    /// assert!(array.try_insert(0, "x").is_ok());
+    /// assert!(array.try_insert(0, "y").is_ok());
+    /// assert!(array.try_insert(0, "z").is_err());
+    /// assert_eq!(&array[..], &["y", "x"]);
+    ///
+    /// ```
+    pub fn try_insert(&mut self, index: usize, element: A::Item) -> Result<(), CapacityError<A::Item>> {
+        if index > self.len() {
+            panic_oob!("try_insert", index, self.len())
+        }
+        if self.len() == self.capacity() {
+            return Err(CapacityError::new(element));
+        }
+        let len = self.len();
+
+        // follows is just like Vec<T>
+        unsafe { // infallible
+            // The spot to put the new value
+            {
+                let p: *mut _ = self.get_unchecked_ptr(index);
+                // Shift everything over to make space. (Duplicating the
+                // `index`th element into two consecutive places.)
+                ptr::copy(p, p.offset(1), len - index);
+                // Write it in, overwriting the first copy of the `index`th
+                // element.
+                ptr::write(p, element);
+            }
+            self.set_len(len + 1);
+        }
+        Ok(())
+    }
+
+    /// Remove the last element in the vector and return it.
+    ///
+    /// Return `Some(` *element* `)` if the vector is non-empty, else `None`.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::<[_; 2]>::new();
+    ///
+    /// array.push(1);
+    ///
+    /// assert_eq!(array.pop(), Some(1));
+    /// assert_eq!(array.pop(), None);
+    /// ```
+    pub fn pop(&mut self) -> Option<A::Item> {
+        if self.len() == 0 {
+            return None;
+        }
+        unsafe {
+            let new_len = self.len() - 1;
+            self.set_len(new_len);
+            Some(ptr::read(self.get_unchecked_ptr(new_len)))
+        }
+    }
+
+    /// Remove the element at `index` and swap the last element into its place.
+    ///
+    /// This operation is O(1).
+    ///
+    /// Return the *element* if the index is in bounds, else panic.
+    ///
+    /// ***Panics*** if the `index` is out of bounds.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1, 2, 3]);
+    ///
+    /// assert_eq!(array.swap_remove(0), 1);
+    /// assert_eq!(&array[..], &[3, 2]);
+    ///
+    /// assert_eq!(array.swap_remove(1), 2);
+    /// assert_eq!(&array[..], &[3]);
+    /// ```
+    pub fn swap_remove(&mut self, index: usize) -> A::Item {
+        self.swap_pop(index)
+            .unwrap_or_else(|| {
+                panic_oob!("swap_remove", index, self.len())
+            })
+    }
+
+    /// Remove the element at `index` and swap the last element into its place.
+    ///
+    /// This is a checked version of `.swap_remove`.  
+    /// This operation is O(1).
+    ///
+    /// Return `Some(` *element* `)` if the index is in bounds, else `None`.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1, 2, 3]);
+    ///
+    /// assert_eq!(array.swap_pop(0), Some(1));
+    /// assert_eq!(&array[..], &[3, 2]);
+    ///
+    /// assert_eq!(array.swap_pop(10), None);
+    /// ```
+    pub fn swap_pop(&mut self, index: usize) -> Option<A::Item> {
+        let len = self.len();
+        if index >= len {
+            return None;
+        }
+        self.swap(index, len - 1);
+        self.pop()
+    }
+
+    /// Remove the element at `index` and shift down the following elements.
+    ///
+    /// The `index` must be strictly less than the length of the vector.
+    ///
+    /// ***Panics*** if the `index` is out of bounds.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1, 2, 3]);
+    ///
+    /// let removed_elt = array.remove(0);
+    /// assert_eq!(removed_elt, 1);
+    /// assert_eq!(&array[..], &[2, 3]);
+    /// ```
+    pub fn remove(&mut self, index: usize) -> A::Item {
+        self.pop_at(index)
+            .unwrap_or_else(|| {
+                panic_oob!("remove", index, self.len())
+            })
+    }
+
+    /// Remove the element at `index` and shift down the following elements.
+    ///
+    /// This is a checked version of `.remove(index)`. Returns `None` if there
+    /// is no element at `index`. Otherwise, return the element inside `Some`.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1, 2, 3]);
+    ///
+    /// assert!(array.pop_at(0).is_some());
+    /// assert_eq!(&array[..], &[2, 3]);
+    ///
+    /// assert!(array.pop_at(2).is_none());
+    /// assert!(array.pop_at(10).is_none());
+    /// ```
+    pub fn pop_at(&mut self, index: usize) -> Option<A::Item> {
+        if index >= self.len() {
+            None
+        } else {
+            self.drain(index..index + 1).next()
+        }
+    }
+
+    /// Shortens the vector, keeping the first `len` elements and dropping
+    /// the rest.
+    ///
+    /// If `len` is greater than the vector’s current length this has no
+    /// effect.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1, 2, 3, 4, 5]);
+    /// array.truncate(3);
+    /// assert_eq!(&array[..], &[1, 2, 3]);
+    /// array.truncate(4);
+    /// assert_eq!(&array[..], &[1, 2, 3]);
+    /// ```
+    pub fn truncate(&mut self, new_len: usize) {
+        unsafe {
+            if new_len < self.len() {
+                let tail: *mut [_] = &mut self[new_len..];
+                self.len = Index::from(new_len);
+                ptr::drop_in_place(tail);
+            }
+        }
+    }
+
+    /// Remove all elements in the vector.
+    pub fn clear(&mut self) {
+        self.truncate(0)
+    }
+
+    /// Retains only the elements specified by the predicate.
+    ///
+    /// In other words, remove all elements `e` such that `f(&mut e)` returns false.
+    /// This method operates in place and preserves the order of the retained
+    /// elements.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1, 2, 3, 4]);
+    /// array.retain(|x| *x & 1 != 0 );
+    /// assert_eq!(&array[..], &[1, 3]);
+    /// ```
+    pub fn retain<F>(&mut self, mut f: F)
+        where F: FnMut(&mut A::Item) -> bool
+    {
+        let len = self.len();
+        let mut del = 0;
+        {
+            let v = &mut **self;
+
+            for i in 0..len {
+                if !f(&mut v[i]) {
+                    del += 1;
+                } else if del > 0 {
+                    v.swap(i - del, i);
+                }
+            }
+        }
+        if del > 0 {
+            self.drain(len - del..);
+        }
+    }
+
+    /// Set the vector’s length without dropping or moving out elements
+    ///
+    /// This method is `unsafe` because it changes the notion of the
+    /// number of “valid” elements in the vector. Use with care.
+    ///
+    /// This method uses *debug assertions* to check that `length` is
+    /// not greater than the capacity.
+    pub unsafe fn set_len(&mut self, length: usize) {
+        debug_assert!(length <= self.capacity());
+        self.len = Index::from(length);
+    }
+
+    /// Copy and appends all elements in a slice to the `ArrayVec`.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut vec: ArrayVec<[usize; 10]> = ArrayVec::new();
+    /// vec.push(1);
+    /// vec.try_extend_from_slice(&[2, 3]).unwrap();
+    /// assert_eq!(&vec[..], &[1, 2, 3]);
+    /// ```
+    ///
+    /// # Errors
+    ///
+    /// This method will return an error if the capacity left (see
+    /// [`remaining_capacity`]) is smaller then the length of the provided
+    /// slice.
+    ///
+    /// [`remaining_capacity`]: #method.remaining_capacity
+    pub fn try_extend_from_slice(&mut self, other: &[A::Item]) -> Result<(), CapacityError>
+        where A::Item: Copy,
+    {
+        if self.remaining_capacity() < other.len() {
+            return Err(CapacityError::new(()));
+        }
+
+        let self_len = self.len();
+        let other_len = other.len();
+
+        unsafe {
+            let dst = self.xs.ptr_mut().add(self_len);
+            ptr::copy_nonoverlapping(other.as_ptr(), dst, other_len);
+            self.set_len(self_len + other_len);
+        }
+        Ok(())
+    }
+
+    /// Create a draining iterator that removes the specified range in the vector
+    /// and yields the removed items from start to end. The element range is
+    /// removed even if the iterator is not consumed until the end.
+    ///
+    /// Note: It is unspecified how many elements are removed from the vector,
+    /// if the `Drain` value is leaked.
+    ///
+    /// **Panics** if the starting point is greater than the end point or if
+    /// the end point is greater than the length of the vector.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut v = ArrayVec::from([1, 2, 3]);
+    /// let u: ArrayVec<[_; 3]> = v.drain(0..2).collect();
+    /// assert_eq!(&v[..], &[3]);
+    /// assert_eq!(&u[..], &[1, 2]);
+    /// ```
+    pub fn drain<R>(&mut self, range: R) -> Drain<A>
+        where R: RangeBounds<usize>
+    {
+        // Memory safety
+        //
+        // When the Drain is first created, it shortens the length of
+        // the source vector to make sure no uninitialized or moved-from elements
+        // are accessible at all if the Drain's destructor never gets to run.
+        //
+        // Drain will ptr::read out the values to remove.
+        // When finished, remaining tail of the vec is copied back to cover
+        // the hole, and the vector length is restored to the new length.
+        //
+        let len = self.len();
+        let start = match range.start_bound() {
+            Bound::Unbounded => 0,
+            Bound::Included(&i) => i,
+            Bound::Excluded(&i) => i.saturating_add(1),
+        };
+        let end = match range.end_bound() {
+            Bound::Excluded(&j) => j,
+            Bound::Included(&j) => j.saturating_add(1),
+            Bound::Unbounded => len,
+        };
+        self.drain_range(start, end)
+    }
+
+    fn drain_range(&mut self, start: usize, end: usize) -> Drain<A>
+    {
+        let len = self.len();
+
+        // bounds check happens here (before length is changed!)
+        let range_slice: *const _ = &self[start..end];
+
+        // Calling `set_len` creates a fresh and thus unique mutable references, making all
+        // older aliases we created invalid. So we cannot call that function.
+        self.len = Index::from(start);
+
+        unsafe {
+            Drain {
+                tail_start: end,
+                tail_len: len - end,
+                iter: (*range_slice).iter(),
+                vec: self as *mut _,
+            }
+        }
+    }
+
+    /// Return the inner fixed size array, if it is full to its capacity.
+    ///
+    /// Return an `Ok` value with the array if length equals capacity,
+    /// return an `Err` with self otherwise.
+    pub fn into_inner(self) -> Result<A, Self> {
+        if self.len() < self.capacity() {
+            Err(self)
+        } else {
+            unsafe {
+                let array = ptr::read(self.xs.ptr() as *const A);
+                mem::forget(self);
+                Ok(array)
+            }
+        }
+    }
+
+    /// Dispose of `self` (same as drop)
+    #[deprecated="Use std::mem::drop instead, if at all needed."]
+    pub fn dispose(mut self) {
+        self.clear();
+        mem::forget(self);
+    }
+
+    /// Return a slice containing all elements of the vector.
+    pub fn as_slice(&self) -> &[A::Item] {
+        self
+    }
+
+    /// Return a mutable slice containing all elements of the vector.
+    pub fn as_mut_slice(&mut self) -> &mut [A::Item] {
+        self
+    }
+
+    /// Return a raw pointer to the vector's buffer.
+    pub fn as_ptr(&self) -> *const A::Item {
+        self.xs.ptr()
+    }
+
+    /// Return a raw mutable pointer to the vector's buffer.
+    pub fn as_mut_ptr(&mut self) -> *mut A::Item {
+        self.xs.ptr_mut()
+    }
+}
+
+impl<A: Array> Deref for ArrayVec<A> {
+    type Target = [A::Item];
+    #[inline]
+    fn deref(&self) -> &[A::Item] {
+        unsafe {
+            slice::from_raw_parts(self.xs.ptr(), self.len())
+        }
+    }
+}
+
+impl<A: Array> DerefMut for ArrayVec<A> {
+    #[inline]
+    fn deref_mut(&mut self) -> &mut [A::Item] {
+        let len = self.len();
+        unsafe {
+            slice::from_raw_parts_mut(self.xs.ptr_mut(), len)
+        }
+    }
+}
+
+/// Create an `ArrayVec` from an array.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+///
+/// let mut array = ArrayVec::from([1, 2, 3]);
+/// assert_eq!(array.len(), 3);
+/// assert_eq!(array.capacity(), 3);
+/// ```
+impl<A: Array> From<A> for ArrayVec<A> {
+    fn from(array: A) -> Self {
+        ArrayVec { xs: MaybeUninit::from(array), len: Index::from(A::CAPACITY) }
+    }
+}
+
+
+/// Try to create an `ArrayVec` from a slice. This will return an error if the slice was too big to
+/// fit.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+/// use std::convert::TryInto as _;
+///
+/// let array: ArrayVec<[_; 4]> = (&[1, 2, 3] as &[_]).try_into().unwrap();
+/// assert_eq!(array.len(), 3);
+/// assert_eq!(array.capacity(), 4);
+/// ```
+impl<A: Array> std::convert::TryFrom<&[A::Item]> for ArrayVec<A>
+    where
+        A::Item: Clone,
+{
+    type Error = CapacityError;
+
+    fn try_from(slice: &[A::Item]) -> Result<Self, Self::Error> {
+        if A::CAPACITY < slice.len() {
+            Err(CapacityError::new(()))
+        } else {
+            let mut array = Self::new();
+            array.extend(slice.iter().cloned());
+            Ok(array)
+        }
+    }
+}
+
+
+/// Iterate the `ArrayVec` with references to each element.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+///
+/// let array = ArrayVec::from([1, 2, 3]);
+///
+/// for elt in &array {
+///     // ...
+/// }
+/// ```
+impl<'a, A: Array> IntoIterator for &'a ArrayVec<A> {
+    type Item = &'a A::Item;
+    type IntoIter = slice::Iter<'a, A::Item>;
+    fn into_iter(self) -> Self::IntoIter { self.iter() }
+}
+
+/// Iterate the `ArrayVec` with mutable references to each element.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+///
+/// let mut array = ArrayVec::from([1, 2, 3]);
+///
+/// for elt in &mut array {
+///     // ...
+/// }
+/// ```
+impl<'a, A: Array> IntoIterator for &'a mut ArrayVec<A> {
+    type Item = &'a mut A::Item;
+    type IntoIter = slice::IterMut<'a, A::Item>;
+    fn into_iter(self) -> Self::IntoIter { self.iter_mut() }
+}
+
+/// Iterate the `ArrayVec` with each element by value.
+///
+/// The vector is consumed by this operation.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+///
+/// for elt in ArrayVec::from([1, 2, 3]) {
+///     // ...
+/// }
+/// ```
+impl<A: Array> IntoIterator for ArrayVec<A> {
+    type Item = A::Item;
+    type IntoIter = IntoIter<A>;
+    fn into_iter(self) -> IntoIter<A> {
+        IntoIter { index: Index::from(0), v: self, }
+    }
+}
+
+
+/// By-value iterator for `ArrayVec`.
+pub struct IntoIter<A: Array> {
+    index: A::Index,
+    v: ArrayVec<A>,
+}
+
+impl<A: Array> Iterator for IntoIter<A> {
+    type Item = A::Item;
+
+    fn next(&mut self) -> Option<A::Item> {
+        if self.index == self.v.len {
+            None
+        } else {
+            unsafe {
+                let index = self.index.to_usize();
+                self.index = Index::from(index + 1);
+                Some(ptr::read(self.v.get_unchecked_ptr(index)))
+            }
+        }
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        let len = self.v.len() - self.index.to_usize();
+        (len, Some(len))
+    }
+}
+
+impl<A: Array> DoubleEndedIterator for IntoIter<A> {
+    fn next_back(&mut self) -> Option<A::Item> {
+        if self.index == self.v.len {
+            None
+        } else {
+            unsafe {
+                let new_len = self.v.len() - 1;
+                self.v.set_len(new_len);
+                Some(ptr::read(self.v.get_unchecked_ptr(new_len)))
+            }
+        }
+    }
+}
+
+impl<A: Array> ExactSizeIterator for IntoIter<A> { }
+
+impl<A: Array> Drop for IntoIter<A> {
+    fn drop(&mut self) {
+        // panic safety: Set length to 0 before dropping elements.
+        let index = self.index.to_usize();
+        let len = self.v.len();
+        unsafe {
+            self.v.set_len(0);
+            let elements = slice::from_raw_parts_mut(
+                self.v.get_unchecked_ptr(index),
+                len - index);
+            ptr::drop_in_place(elements);
+        }
+    }
+}
+
+impl<A: Array> Clone for IntoIter<A>
+where
+    A::Item: Clone,
+{
+    fn clone(&self) -> IntoIter<A> {
+        self.v[self.index.to_usize()..]
+            .iter()
+            .cloned()
+            .collect::<ArrayVec<A>>()
+            .into_iter()
+    }
+}
+
+impl<A: Array> fmt::Debug for IntoIter<A>
+where
+    A::Item: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_list()
+            .entries(&self.v[self.index.to_usize()..])
+            .finish()
+    }
+}
+
+/// A draining iterator for `ArrayVec`.
+pub struct Drain<'a, A> 
+    where A: Array,
+          A::Item: 'a,
+{
+    /// Index of tail to preserve
+    tail_start: usize,
+    /// Length of tail
+    tail_len: usize,
+    /// Current remaining range to remove
+    iter: slice::Iter<'a, A::Item>,
+    vec: *mut ArrayVec<A>,
+}
+
+unsafe impl<'a, A: Array + Sync> Sync for Drain<'a, A> {}
+unsafe impl<'a, A: Array + Send> Send for Drain<'a, A> {}
+
+impl<'a, A: Array> Iterator for Drain<'a, A>
+    where A::Item: 'a,
+{
+    type Item = A::Item;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|elt|
+            unsafe {
+                ptr::read(elt as *const _)
+            }
+        )
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.iter.size_hint()
+    }
+}
+
+impl<'a, A: Array> DoubleEndedIterator for Drain<'a, A>
+    where A::Item: 'a,
+{
+    fn next_back(&mut self) -> Option<Self::Item> {
+        self.iter.next_back().map(|elt|
+            unsafe {
+                ptr::read(elt as *const _)
+            }
+        )
+    }
+}
+
+impl<'a, A: Array> ExactSizeIterator for Drain<'a, A> where A::Item: 'a {}
+
+impl<'a, A: Array> Drop for Drain<'a, A> 
+    where A::Item: 'a
+{
+    fn drop(&mut self) {
+        // len is currently 0 so panicking while dropping will not cause a double drop.
+
+        // exhaust self first
+        while let Some(_) = self.next() { }
+
+        if self.tail_len > 0 {
+            unsafe {
+                let source_vec = &mut *self.vec;
+                // memmove back untouched tail, update to new length
+                let start = source_vec.len();
+                let tail = self.tail_start;
+                let src = source_vec.as_ptr().add(tail);
+                let dst = source_vec.as_mut_ptr().add(start);
+                ptr::copy(src, dst, self.tail_len);
+                source_vec.set_len(start + self.tail_len);
+            }
+        }
+    }
+}
+
+struct ScopeExitGuard<T, Data, F>
+    where F: FnMut(&Data, &mut T)
+{
+    value: T,
+    data: Data,
+    f: F,
+}
+
+impl<T, Data, F> Drop for ScopeExitGuard<T, Data, F>
+    where F: FnMut(&Data, &mut T)
+{
+    fn drop(&mut self) {
+        (self.f)(&self.data, &mut self.value)
+    }
+}
+
+
+
+/// Extend the `ArrayVec` with an iterator.
+/// 
+/// Does not extract more items than there is space for. No error
+/// occurs if there are more iterator elements.
+impl<A: Array> Extend<A::Item> for ArrayVec<A> {
+    fn extend<T: IntoIterator<Item=A::Item>>(&mut self, iter: T) {
+        let take = self.capacity() - self.len();
+        unsafe {
+            let len = self.len();
+            let mut ptr = raw_ptr_add(self.as_mut_ptr(), len);
+            let end_ptr = raw_ptr_add(ptr, take);
+            // Keep the length in a separate variable, write it back on scope
+            // exit. To help the compiler with alias analysis and stuff.
+            // We update the length to handle panic in the iteration of the
+            // user's iterator, without dropping any elements on the floor.
+            let mut guard = ScopeExitGuard {
+                value: &mut self.len,
+                data: len,
+                f: move |&len, self_len| {
+                    **self_len = Index::from(len);
+                }
+            };
+            let mut iter = iter.into_iter();
+            loop {
+                if ptr == end_ptr { break; }
+                if let Some(elt) = iter.next() {
+                    raw_ptr_write(ptr, elt);
+                    ptr = raw_ptr_add(ptr, 1);
+                    guard.data += 1;
+                } else {
+                    break;
+                }
+            }
+        }
+    }
+}
+
+/// Rawptr add but uses arithmetic distance for ZST
+unsafe fn raw_ptr_add<T>(ptr: *mut T, offset: usize) -> *mut T {
+    if mem::size_of::<T>() == 0 {
+        // Special case for ZST
+        (ptr as usize).wrapping_add(offset) as _
+    } else {
+        ptr.add(offset)
+    }
+}
+
+unsafe fn raw_ptr_write<T>(ptr: *mut T, value: T) {
+    if mem::size_of::<T>() == 0 {
+        /* nothing */
+    } else {
+        ptr::write(ptr, value)
+    }
+}
+
+/// Create an `ArrayVec` from an iterator.
+/// 
+/// Does not extract more items than there is space for. No error
+/// occurs if there are more iterator elements.
+impl<A: Array> iter::FromIterator<A::Item> for ArrayVec<A> {
+    fn from_iter<T: IntoIterator<Item=A::Item>>(iter: T) -> Self {
+        let mut array = ArrayVec::new();
+        array.extend(iter);
+        array
+    }
+}
+
+impl<A: Array> Clone for ArrayVec<A>
+    where A::Item: Clone
+{
+    fn clone(&self) -> Self {
+        self.iter().cloned().collect()
+    }
+
+    fn clone_from(&mut self, rhs: &Self) {
+        // recursive case for the common prefix
+        let prefix = cmp::min(self.len(), rhs.len());
+        self[..prefix].clone_from_slice(&rhs[..prefix]);
+
+        if prefix < self.len() {
+            // rhs was shorter
+            for _ in 0..self.len() - prefix {
+                self.pop();
+            }
+        } else {
+            let rhs_elems = rhs[self.len()..].iter().cloned();
+            self.extend(rhs_elems);
+        }
+    }
+}
+
+impl<A: Array> Hash for ArrayVec<A>
+    where A::Item: Hash
+{
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        Hash::hash(&**self, state)
+    }
+}
+
+impl<A: Array> PartialEq for ArrayVec<A>
+    where A::Item: PartialEq
+{
+    fn eq(&self, other: &Self) -> bool {
+        **self == **other
+    }
+}
+
+impl<A: Array> PartialEq<[A::Item]> for ArrayVec<A>
+    where A::Item: PartialEq
+{
+    fn eq(&self, other: &[A::Item]) -> bool {
+        **self == *other
+    }
+}
+
+impl<A: Array> Eq for ArrayVec<A> where A::Item: Eq { }
+
+impl<A: Array> Borrow<[A::Item]> for ArrayVec<A> {
+    fn borrow(&self) -> &[A::Item] { self }
+}
+
+impl<A: Array> BorrowMut<[A::Item]> for ArrayVec<A> {
+    fn borrow_mut(&mut self) -> &mut [A::Item] { self }
+}
+
+impl<A: Array> AsRef<[A::Item]> for ArrayVec<A> {
+    fn as_ref(&self) -> &[A::Item] { self }
+}
+
+impl<A: Array> AsMut<[A::Item]> for ArrayVec<A> {
+    fn as_mut(&mut self) -> &mut [A::Item] { self }
+}
+
+impl<A: Array> fmt::Debug for ArrayVec<A> where A::Item: fmt::Debug {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { (**self).fmt(f) }
+}
+
+impl<A: Array> Default for ArrayVec<A> {
+    /// Return an empty array
+    fn default() -> ArrayVec<A> {
+        ArrayVec::new()
+    }
+}
+
+impl<A: Array> PartialOrd for ArrayVec<A> where A::Item: PartialOrd {
+    fn partial_cmp(&self, other: &ArrayVec<A>) -> Option<cmp::Ordering> {
+        (**self).partial_cmp(other)
+    }
+
+    fn lt(&self, other: &Self) -> bool {
+        (**self).lt(other)
+    }
+
+    fn le(&self, other: &Self) -> bool {
+        (**self).le(other)
+    }
+
+    fn ge(&self, other: &Self) -> bool {
+        (**self).ge(other)
+    }
+
+    fn gt(&self, other: &Self) -> bool {
+        (**self).gt(other)
+    }
+}
+
+impl<A: Array> Ord for ArrayVec<A> where A::Item: Ord {
+    fn cmp(&self, other: &ArrayVec<A>) -> cmp::Ordering {
+        (**self).cmp(other)
+    }
+}
+
+#[cfg(feature="std")]
+/// `Write` appends written data to the end of the vector.
+///
+/// Requires `features="std"`.
+impl<A: Array<Item=u8>> io::Write for ArrayVec<A> {
+    fn write(&mut self, data: &[u8]) -> io::Result<usize> {
+        let len = cmp::min(self.remaining_capacity(), data.len());
+        let _result = self.try_extend_from_slice(&data[..len]);
+        debug_assert!(_result.is_ok());
+        Ok(len)
+    }
+    fn flush(&mut self) -> io::Result<()> { Ok(()) }
+}
+
+#[cfg(feature="serde")]
+/// Requires crate feature `"serde"`
+impl<T: Serialize, A: Array<Item=T>> Serialize for ArrayVec<A> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
+        serializer.collect_seq(self)
+    }
+}
+
+#[cfg(feature="serde")]
+/// Requires crate feature `"serde"`
+impl<'de, T: Deserialize<'de>, A: Array<Item=T>> Deserialize<'de> for ArrayVec<A> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+        where D: Deserializer<'de>
+    {
+        use serde::de::{Visitor, SeqAccess, Error};
+        use std::marker::PhantomData;
+
+        struct ArrayVecVisitor<'de, T: Deserialize<'de>, A: Array<Item=T>>(PhantomData<(&'de (), T, A)>);
+
+        impl<'de, T: Deserialize<'de>, A: Array<Item=T>> Visitor<'de> for ArrayVecVisitor<'de, T, A> {
+            type Value = ArrayVec<A>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                write!(formatter, "an array with no more than {} items", A::CAPACITY)
+            }
+
+            fn visit_seq<SA>(self, mut seq: SA) -> Result<Self::Value, SA::Error>
+                where SA: SeqAccess<'de>,
+            {
+                let mut values = ArrayVec::<A>::new();
+
+                while let Some(value) = seq.next_element()? {
+                    if let Err(_) = values.try_push(value) {
+                        return Err(SA::Error::invalid_length(A::CAPACITY + 1, &self));
+                    }
+                }
+
+                Ok(values)
+            }
+        }
+
+        deserializer.deserialize_seq(ArrayVecVisitor::<T, A>(PhantomData))
+    }
+}
diff --git a/vendor/arrayvec-0.5.2/src/maybe_uninit.rs b/vendor/arrayvec-0.5.2/src/maybe_uninit.rs
new file mode 100644
index 000000000..e009abfc8
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/src/maybe_uninit.rs
@@ -0,0 +1,44 @@
+
+
+use crate::array::Array;
+use std::mem::MaybeUninit as StdMaybeUninit;
+
+#[derive(Copy)]
+pub struct MaybeUninit<T> {
+    inner: StdMaybeUninit<T>,
+}
+
+impl<T> Clone for MaybeUninit<T>
+    where T: Copy
+{
+    fn clone(&self) -> Self { *self }
+}
+
+impl<T> MaybeUninit<T> {
+    /// Create a new MaybeUninit with uninitialized interior
+    pub const unsafe fn uninitialized() -> Self {
+        MaybeUninit { inner: StdMaybeUninit::uninit() }
+    }
+
+    /// Create a new MaybeUninit from the value `v`.
+    pub fn from(v: T) -> Self {
+        MaybeUninit { inner: StdMaybeUninit::new(v) }
+    }
+
+    // Raw pointer casts written so that we don't reference or access the
+    // uninitialized interior value
+
+    /// Return a raw pointer to the start of the interior array
+    pub fn ptr(&self) -> *const T::Item
+        where T: Array
+    {
+        self.inner.as_ptr() as *const T::Item
+    }
+
+    /// Return a mut raw pointer to the start of the interior array
+    pub fn ptr_mut(&mut self) -> *mut T::Item
+        where T: Array
+    {
+        self.inner.as_mut_ptr() as *mut T::Item
+    }
+}
diff --git a/vendor/arrayvec-0.5.2/tests/serde.rs b/vendor/arrayvec-0.5.2/tests/serde.rs
new file mode 100644
index 000000000..3876d2a7c
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/tests/serde.rs
@@ -0,0 +1,79 @@
+#![cfg(feature = "serde")]
+extern crate arrayvec;
+extern crate serde_test;
+
+mod array_vec {
+    use arrayvec::ArrayVec;
+
+    use serde_test::{Token, assert_tokens, assert_de_tokens_error};
+
+    #[test]
+    fn test_ser_de_empty() {
+        let vec = ArrayVec::<[u32; 0]>::new();
+
+        assert_tokens(&vec, &[
+            Token::Seq { len: Some(0) },
+            Token::SeqEnd,
+        ]);
+    }
+
+
+    #[test]
+    fn test_ser_de() {
+        let mut vec = ArrayVec::<[u32; 3]>::new();
+        vec.push(20);
+        vec.push(55);
+        vec.push(123);
+
+        assert_tokens(&vec, &[
+            Token::Seq { len: Some(3) },
+            Token::U32(20),
+            Token::U32(55),
+            Token::U32(123),
+            Token::SeqEnd,
+        ]);
+    }
+
+    #[test]
+    fn test_de_too_large() {
+        assert_de_tokens_error::<ArrayVec<[u32; 2]>>(&[
+            Token::Seq { len: Some(3) },
+            Token::U32(13),
+            Token::U32(42),
+            Token::U32(68),
+        ], "invalid length 3, expected an array with no more than 2 items");
+    }
+}
+
+mod array_string {
+    use arrayvec::ArrayString;
+
+    use serde_test::{Token, assert_tokens, assert_de_tokens_error};
+
+    #[test]
+    fn test_ser_de_empty() {
+        let string = ArrayString::<[u8; 0]>::new();
+
+        assert_tokens(&string, &[
+            Token::Str(""),
+        ]);
+    }
+
+
+    #[test]
+    fn test_ser_de() {
+        let string = ArrayString::<[u8; 9]>::from("1234 abcd")
+            .expect("expected exact specified capacity to be enough");
+
+        assert_tokens(&string, &[
+            Token::Str("1234 abcd"),
+        ]);
+    }
+
+    #[test]
+    fn test_de_too_large() {
+        assert_de_tokens_error::<ArrayString<[u8; 2]>>(&[
+            Token::Str("afd")
+        ], "invalid length 3, expected a string no more than 2 bytes long");
+    }
+}
diff --git a/vendor/arrayvec-0.5.2/tests/tests.rs b/vendor/arrayvec-0.5.2/tests/tests.rs
new file mode 100644
index 000000000..c7ebcd0c4
--- /dev/null
+++ b/vendor/arrayvec-0.5.2/tests/tests.rs
@@ -0,0 +1,688 @@
+extern crate arrayvec;
+#[macro_use] extern crate matches;
+
+use arrayvec::ArrayVec;
+use arrayvec::ArrayString;
+use std::mem;
+use arrayvec::CapacityError;
+
+use std::collections::HashMap;
+
+
+#[test]
+fn test_simple() {
+    use std::ops::Add;
+
+    let mut vec: ArrayVec<[Vec<i32>; 3]> = ArrayVec::new();
+
+    vec.push(vec![1, 2, 3, 4]);
+    vec.push(vec![10]);
+    vec.push(vec![-1, 13, -2]);
+
+    for elt in &vec {
+        assert_eq!(elt.iter().fold(0, Add::add), 10);
+    }
+
+    let sum_len = vec.into_iter().map(|x| x.len()).fold(0, Add::add);
+    assert_eq!(sum_len, 8);
+}
+
+#[test]
+fn test_capacity_left() {
+    let mut vec: ArrayVec<[usize; 4]> = ArrayVec::new();
+    assert_eq!(vec.remaining_capacity(), 4);
+    vec.push(1);
+    assert_eq!(vec.remaining_capacity(), 3);
+    vec.push(2);
+    assert_eq!(vec.remaining_capacity(), 2);
+    vec.push(3);
+    assert_eq!(vec.remaining_capacity(), 1);
+    vec.push(4);
+    assert_eq!(vec.remaining_capacity(), 0);
+}
+
+#[test]
+fn test_extend_from_slice() {
+    let mut vec: ArrayVec<[usize; 10]> = ArrayVec::new();
+
+    vec.try_extend_from_slice(&[1, 2, 3]).unwrap();
+    assert_eq!(vec.len(), 3);
+    assert_eq!(&vec[..], &[1, 2, 3]);
+    assert_eq!(vec.pop(), Some(3));
+    assert_eq!(&vec[..], &[1, 2]);
+}
+
+#[test]
+fn test_extend_from_slice_error() {
+    let mut vec: ArrayVec<[usize; 10]> = ArrayVec::new();
+
+    vec.try_extend_from_slice(&[1, 2, 3]).unwrap();
+    let res = vec.try_extend_from_slice(&[0; 8]);
+    assert_matches!(res, Err(_));
+
+    let mut vec: ArrayVec<[usize; 0]> = ArrayVec::new();
+    let res = vec.try_extend_from_slice(&[0; 1]);
+    assert_matches!(res, Err(_));
+}
+
+#[test]
+fn test_try_from_slice_error() {
+    use arrayvec::ArrayVec;
+    use std::convert::TryInto as _;
+
+    let res: Result<ArrayVec<[_; 2]>, _> = (&[1, 2, 3] as &[_]).try_into();
+    assert_matches!(res, Err(_));
+}
+
+#[test]
+fn test_u16_index() {
+    const N: usize = 4096;
+    let mut vec: ArrayVec<[_; N]> = ArrayVec::new();
+    for _ in 0..N {
+        assert!(vec.try_push(1u8).is_ok());
+    }
+    assert!(vec.try_push(0).is_err());
+    assert_eq!(vec.len(), N);
+}
+
+#[test]
+fn test_iter() {
+    let mut iter = ArrayVec::from([1, 2, 3]).into_iter();
+    assert_eq!(iter.size_hint(), (3, Some(3)));
+    assert_eq!(iter.next_back(), Some(3));
+    assert_eq!(iter.next(), Some(1));
+    assert_eq!(iter.next_back(), Some(2));
+    assert_eq!(iter.size_hint(), (0, Some(0)));
+    assert_eq!(iter.next_back(), None);
+}
+
+#[test]
+fn test_drop() {
+    use std::cell::Cell;
+
+    let flag = &Cell::new(0);
+
+    #[derive(Clone)]
+    struct Bump<'a>(&'a Cell<i32>);
+
+    impl<'a> Drop for Bump<'a> {
+        fn drop(&mut self) {
+            let n = self.0.get();
+            self.0.set(n + 1);
+        }
+    }
+
+    {
+        let mut array = ArrayVec::<[Bump; 128]>::new();
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+    }
+    assert_eq!(flag.get(), 2);
+
+    // test something with the nullable pointer optimization
+    flag.set(0);
+
+    {
+        let mut array = ArrayVec::<[_; 3]>::new();
+        array.push(vec![Bump(flag)]);
+        array.push(vec![Bump(flag), Bump(flag)]);
+        array.push(vec![]);
+        let push4 = array.try_push(vec![Bump(flag)]);
+        assert_eq!(flag.get(), 0);
+        drop(push4);
+        assert_eq!(flag.get(), 1);
+        drop(array.pop());
+        assert_eq!(flag.get(), 1);
+        drop(array.pop());
+        assert_eq!(flag.get(), 3);
+    }
+
+    assert_eq!(flag.get(), 4);
+
+    // test into_inner
+    flag.set(0);
+    {
+        let mut array = ArrayVec::<[_; 3]>::new();
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        let inner = array.into_inner();
+        assert!(inner.is_ok());
+        assert_eq!(flag.get(), 0);
+        drop(inner);
+        assert_eq!(flag.get(), 3);
+    }
+
+    // test cloning into_iter
+    flag.set(0);
+    {
+        let mut array = ArrayVec::<[_; 3]>::new();
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        let mut iter = array.into_iter();
+        assert_eq!(flag.get(), 0);
+        iter.next();
+        assert_eq!(flag.get(), 1);
+        let clone = iter.clone();
+        assert_eq!(flag.get(), 1);
+        drop(clone);
+        assert_eq!(flag.get(), 3);
+        drop(iter);
+        assert_eq!(flag.get(), 5);
+    }
+}
+
+#[test]
+fn test_drop_panics() {
+    use std::cell::Cell;
+    use std::panic::catch_unwind;
+    use std::panic::AssertUnwindSafe;
+
+    let flag = &Cell::new(0);
+
+    struct Bump<'a>(&'a Cell<i32>);
+
+    // Panic in the first drop
+    impl<'a> Drop for Bump<'a> {
+        fn drop(&mut self) {
+            let n = self.0.get();
+            self.0.set(n + 1);
+            if n == 0 {
+                panic!("Panic in Bump's drop");
+            }
+        }
+    }
+    // check if rust is new enough
+    flag.set(0);
+    {
+        let array = vec![Bump(flag), Bump(flag)];
+        let res = catch_unwind(AssertUnwindSafe(|| {
+            drop(array);
+        }));
+        assert!(res.is_err());
+    }
+
+    if flag.get() != 2 {
+        println!("test_drop_panics: skip, this version of Rust doesn't continue in drop_in_place");
+        return;
+    }
+
+    flag.set(0);
+    {
+        let mut array = ArrayVec::<[Bump; 128]>::new();
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+
+        let res = catch_unwind(AssertUnwindSafe(|| {
+            drop(array);
+        }));
+        assert!(res.is_err());
+    }
+    // Check that all the elements drop, even if the first drop panics.
+    assert_eq!(flag.get(), 3);
+
+
+    flag.set(0);
+    {
+        let mut array = ArrayVec::<[Bump; 16]>::new();
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+
+        let i = 2;
+        let tail_len = array.len() - i;
+
+        let res = catch_unwind(AssertUnwindSafe(|| {
+            array.truncate(i);
+        }));
+        assert!(res.is_err());
+        // Check that all the tail elements drop, even if the first drop panics.
+        assert_eq!(flag.get(), tail_len as i32);
+    }
+
+
+}
+
+#[test]
+fn test_extend() {
+    let mut range = 0..10;
+
+    let mut array: ArrayVec<[_; 5]> = range.by_ref().collect();
+    assert_eq!(&array[..], &[0, 1, 2, 3, 4]);
+    assert_eq!(range.next(), Some(5));
+
+    array.extend(range.by_ref());
+    assert_eq!(range.next(), Some(6));
+
+    let mut array: ArrayVec<[_; 10]> = (0..3).collect();
+    assert_eq!(&array[..], &[0, 1, 2]);
+    array.extend(3..5);
+    assert_eq!(&array[..], &[0, 1, 2, 3, 4]);
+}
+
+#[test]
+fn test_is_send_sync() {
+    let data = ArrayVec::<[Vec<i32>; 5]>::new();
+    &data as &dyn Send;
+    &data as &dyn Sync;
+}
+
+#[test]
+fn test_compact_size() {
+    // Future rust will kill these drop flags!
+    // 4 elements size + 1 len + 1 enum tag + [1 drop flag]
+    type ByteArray = ArrayVec<[u8; 4]>;
+    println!("{}", mem::size_of::<ByteArray>());
+    assert!(mem::size_of::<ByteArray>() <= 8);
+
+    // 1 enum tag + 1 drop flag
+    type EmptyArray = ArrayVec<[u8; 0]>;
+    println!("{}", mem::size_of::<EmptyArray>());
+    assert!(mem::size_of::<EmptyArray>() <= 2);
+
+    // 12 element size + 1 enum tag + 3 padding + 1 len + 1 drop flag + 2 padding
+    type QuadArray = ArrayVec<[u32; 3]>;
+    println!("{}", mem::size_of::<QuadArray>());
+    assert!(mem::size_of::<QuadArray>() <= 24);
+}
+
+#[test]
+fn test_still_works_with_option_arrayvec() {
+    type RefArray = ArrayVec<[&'static i32; 2]>;
+    let array = Some(RefArray::new());
+    assert!(array.is_some());
+    println!("{:?}", array);
+}
+
+#[test]
+fn test_drain() {
+    let mut v = ArrayVec::from([0; 8]);
+    v.pop();
+    v.drain(0..7);
+    assert_eq!(&v[..], &[]);
+
+    v.extend(0..);
+    v.drain(1..4);
+    assert_eq!(&v[..], &[0, 4, 5, 6, 7]);
+    let u: ArrayVec<[_; 3]> = v.drain(1..4).rev().collect();
+    assert_eq!(&u[..], &[6, 5, 4]);
+    assert_eq!(&v[..], &[0, 7]);
+    v.drain(..);
+    assert_eq!(&v[..], &[]);
+}
+
+#[test]
+fn test_drain_range_inclusive() {
+    let mut v = ArrayVec::from([0; 8]);
+    v.drain(0..=7);
+    assert_eq!(&v[..], &[]);
+
+    v.extend(0..);
+    v.drain(1..=4);
+    assert_eq!(&v[..], &[0, 5, 6, 7]);
+    let u: ArrayVec<[_; 3]> = v.drain(1..=2).rev().collect();
+    assert_eq!(&u[..], &[6, 5]);
+    assert_eq!(&v[..], &[0, 7]);
+    v.drain(..);
+    assert_eq!(&v[..], &[]);
+}
+
+#[test]
+#[should_panic]
+fn test_drain_range_inclusive_oob() {
+    let mut v = ArrayVec::from([0; 0]);
+    v.drain(0..=0);
+}
+
+#[test]
+fn test_retain() {
+    let mut v = ArrayVec::from([0; 8]);
+    for (i, elt) in v.iter_mut().enumerate() {
+        *elt = i;
+    }
+    v.retain(|_| true);
+    assert_eq!(&v[..], &[0, 1, 2, 3, 4, 5, 6, 7]);
+    v.retain(|elt| {
+        *elt /= 2;
+        *elt % 2 == 0
+    });
+    assert_eq!(&v[..], &[0, 0, 2, 2]);
+    v.retain(|_| false);
+    assert_eq!(&v[..], &[]);
+}
+
+#[test]
+#[should_panic]
+fn test_drain_oob() {
+    let mut v = ArrayVec::from([0; 8]);
+    v.pop();
+    v.drain(0..8);
+}
+
+#[test]
+#[should_panic]
+fn test_drop_panic() {
+    struct DropPanic;
+
+    impl Drop for DropPanic {
+        fn drop(&mut self) {
+            panic!("drop");
+        }
+    }
+
+    let mut array = ArrayVec::<[DropPanic; 1]>::new();
+    array.push(DropPanic);
+}
+
+#[test]
+#[should_panic]
+fn test_drop_panic_into_iter() {
+    struct DropPanic;
+
+    impl Drop for DropPanic {
+        fn drop(&mut self) {
+            panic!("drop");
+        }
+    }
+
+    let mut array = ArrayVec::<[DropPanic; 1]>::new();
+    array.push(DropPanic);
+    array.into_iter();
+}
+
+#[test]
+fn test_insert() {
+    let mut v = ArrayVec::from([]);
+    assert_matches!(v.try_push(1), Err(_));
+
+    let mut v = ArrayVec::<[_; 3]>::new();
+    v.insert(0, 0);
+    v.insert(1, 1);
+    //let ret1 = v.try_insert(3, 3);
+    //assert_matches!(ret1, Err(InsertError::OutOfBounds(_)));
+    assert_eq!(&v[..], &[0, 1]);
+    v.insert(2, 2);
+    assert_eq!(&v[..], &[0, 1, 2]);
+
+    let ret2 = v.try_insert(1, 9);
+    assert_eq!(&v[..], &[0, 1, 2]);
+    assert_matches!(ret2, Err(_));
+
+    let mut v = ArrayVec::from([2]);
+    assert_matches!(v.try_insert(0, 1), Err(CapacityError { .. }));
+    assert_matches!(v.try_insert(1, 1), Err(CapacityError { .. }));
+    //assert_matches!(v.try_insert(2, 1), Err(CapacityError { .. }));
+}
+
+#[test]
+fn test_into_inner_1() {
+    let mut v = ArrayVec::from([1, 2]);
+    v.pop();
+    let u = v.clone();
+    assert_eq!(v.into_inner(), Err(u));
+}
+
+#[test]
+fn test_into_inner_2() {
+    let mut v = ArrayVec::<[String; 4]>::new();
+    v.push("a".into());
+    v.push("b".into());
+    v.push("c".into());
+    v.push("d".into());
+    assert_eq!(v.into_inner().unwrap(), ["a", "b", "c", "d"]);
+}
+
+#[test]
+fn test_into_inner_3_() {
+    let mut v = ArrayVec::<[i32; 4]>::new();
+    v.extend(1..);
+    assert_eq!(v.into_inner().unwrap(), [1, 2, 3, 4]);
+}
+
+#[cfg(feature="std")]
+#[test]
+fn test_write() {
+    use std::io::Write;
+    let mut v = ArrayVec::<[_; 8]>::new();
+    write!(&mut v, "\x01\x02\x03").unwrap();
+    assert_eq!(&v[..], &[1, 2, 3]);
+    let r = v.write(&[9; 16]).unwrap();
+    assert_eq!(r, 5);
+    assert_eq!(&v[..], &[1, 2, 3, 9, 9, 9, 9, 9]);
+}
+
+#[test]
+fn array_clone_from() {
+    let mut v = ArrayVec::<[_; 4]>::new();
+    v.push(vec![1, 2]);
+    v.push(vec![3, 4, 5]);
+    v.push(vec![6]);
+    let reference = v.to_vec();
+    let mut u = ArrayVec::<[_; 4]>::new();
+    u.clone_from(&v);
+    assert_eq!(&u, &reference[..]);
+
+    let mut t = ArrayVec::<[_; 4]>::new();
+    t.push(vec![97]);
+    t.push(vec![]);
+    t.push(vec![5, 6, 2]);
+    t.push(vec![2]);
+    t.clone_from(&v);
+    assert_eq!(&t, &reference[..]);
+    t.clear();
+    t.clone_from(&v);
+    assert_eq!(&t, &reference[..]);
+}
+
+#[cfg(feature="std")]
+#[test]
+fn test_string() {
+    use std::error::Error;
+
+    let text = "hello world";
+    let mut s = ArrayString::<[_; 16]>::new();
+    s.try_push_str(text).unwrap();
+    assert_eq!(&s, text);
+    assert_eq!(text, &s);
+
+    // Make sure Hash / Eq / Borrow match up so we can use HashMap
+    let mut map = HashMap::new();
+    map.insert(s, 1);
+    assert_eq!(map[text], 1);
+
+    let mut t = ArrayString::<[_; 2]>::new();
+    assert!(t.try_push_str(text).is_err());
+    assert_eq!(&t, "");
+
+    t.push_str("ab");
+    // DerefMut
+    let tmut: &mut str = &mut t;
+    assert_eq!(tmut, "ab");
+
+    // Test Error trait / try
+    let t = || -> Result<(), Box<dyn Error>> {
+        let mut t = ArrayString::<[_; 2]>::new();
+        t.try_push_str(text)?;
+        Ok(())
+    }();
+    assert!(t.is_err());
+}
+
+#[test]
+fn test_string_from() {
+    let text = "hello world";
+	// Test `from` constructor
+    let u = ArrayString::<[_; 11]>::from(text).unwrap();
+    assert_eq!(&u, text);
+    assert_eq!(u.len(), text.len());
+}
+
+#[test]
+fn test_string_parse_from_str() {
+    let text = "hello world";
+    let u: ArrayString<[_; 11]> = text.parse().unwrap();
+    assert_eq!(&u, text);
+    assert_eq!(u.len(), text.len());
+}
+
+#[test]
+fn test_string_from_bytes() {
+    let text = "hello world";
+    let u = ArrayString::from_byte_string(b"hello world").unwrap();
+    assert_eq!(&u, text);
+    assert_eq!(u.len(), text.len());
+}
+
+#[test]
+fn test_string_clone() {
+    let text = "hi";
+    let mut s = ArrayString::<[_; 4]>::new();
+    s.push_str("abcd");
+    let t = ArrayString::<[_; 4]>::from(text).unwrap();
+    s.clone_from(&t);
+    assert_eq!(&t, &s);
+}
+
+#[test]
+fn test_string_push() {
+    let text = "abcαβγ";
+    let mut s = ArrayString::<[_; 8]>::new();
+    for c in text.chars() {
+        if let Err(_) = s.try_push(c) {
+            break;
+        }
+    }
+    assert_eq!("abcαβ", &s[..]);
+    s.push('x');
+    assert_eq!("abcαβx", &s[..]);
+    assert!(s.try_push('x').is_err());
+}
+
+
+#[test]
+fn test_insert_at_length() {
+    let mut v = ArrayVec::<[_; 8]>::new();
+    let result1 = v.try_insert(0, "a");
+    let result2 = v.try_insert(1, "b");
+    assert!(result1.is_ok() && result2.is_ok());
+    assert_eq!(&v[..], &["a", "b"]);
+}
+
+#[should_panic]
+#[test]
+fn test_insert_out_of_bounds() {
+    let mut v = ArrayVec::<[_; 8]>::new();
+    let _ = v.try_insert(1, "test");
+}
+
+/*
+ * insert that pushes out the last
+    let mut u = ArrayVec::from([1, 2, 3, 4]);
+    let ret = u.try_insert(3, 99);
+    assert_eq!(&u[..], &[1, 2, 3, 99]);
+    assert_matches!(ret, Err(_));
+    let ret = u.try_insert(4, 77);
+    assert_eq!(&u[..], &[1, 2, 3, 99]);
+    assert_matches!(ret, Err(_));
+*/
+
+#[test]
+fn test_drop_in_insert() {
+    use std::cell::Cell;
+
+    let flag = &Cell::new(0);
+
+    struct Bump<'a>(&'a Cell<i32>);
+
+    impl<'a> Drop for Bump<'a> {
+        fn drop(&mut self) {
+            let n = self.0.get();
+            self.0.set(n + 1);
+        }
+    }
+
+    flag.set(0);
+
+    {
+        let mut array = ArrayVec::<[_; 2]>::new();
+        array.push(Bump(flag));
+        array.insert(0, Bump(flag));
+        assert_eq!(flag.get(), 0);
+        let ret = array.try_insert(1, Bump(flag));
+        assert_eq!(flag.get(), 0);
+        assert_matches!(ret, Err(_));
+        drop(ret);
+        assert_eq!(flag.get(), 1);
+    }
+    assert_eq!(flag.get(), 3);
+}
+
+#[test]
+fn test_pop_at() {
+    let mut v = ArrayVec::<[String; 4]>::new();
+    let s = String::from;
+    v.push(s("a"));
+    v.push(s("b"));
+    v.push(s("c"));
+    v.push(s("d"));
+
+    assert_eq!(v.pop_at(4), None);
+    assert_eq!(v.pop_at(1), Some(s("b")));
+    assert_eq!(v.pop_at(1), Some(s("c")));
+    assert_eq!(v.pop_at(2), None);
+    assert_eq!(&v[..], &["a", "d"]);
+}
+
+#[test]
+fn test_sizes() {
+    let v = ArrayVec::from([0u8; 1 << 16]);
+    assert_eq!(vec![0u8; v.len()], &v[..]);
+}
+
+#[test]
+fn test_default() {
+    use std::net;
+    let s: ArrayString<[u8; 4]> = Default::default();
+    // Something without `Default` implementation.
+    let v: ArrayVec<[net::TcpStream; 4]> = Default::default();
+    assert_eq!(s.len(), 0);
+    assert_eq!(v.len(), 0);
+}
+
+#[cfg(feature="array-sizes-33-128")]
+#[test]
+fn test_sizes_33_128() {
+    ArrayVec::from([0u8; 52]);
+    ArrayVec::from([0u8; 127]);
+}
+
+#[cfg(feature="array-sizes-129-255")]
+#[test]
+fn test_sizes_129_255() {
+    ArrayVec::from([0u8; 237]);
+    ArrayVec::from([0u8; 255]);
+}
+
+#[test]
+fn test_extend_zst() {
+    let mut range = 0..10;
+    #[derive(Copy, Clone, PartialEq, Debug)]
+    struct Z; // Zero sized type
+
+    let mut array: ArrayVec<[_; 5]> = range.by_ref().map(|_| Z).collect();
+    assert_eq!(&array[..], &[Z; 5]);
+    assert_eq!(range.next(), Some(5));
+
+    array.extend(range.by_ref().map(|_| Z));
+    assert_eq!(range.next(), Some(6));
+
+    let mut array: ArrayVec<[_; 10]> = (0..3).map(|_| Z).collect();
+    assert_eq!(&array[..], &[Z; 3]);
+    array.extend((3..5).map(|_| Z));
+    assert_eq!(&array[..], &[Z; 5]);
+    assert_eq!(array.len(), 5);
+}