Vendor dependenciesvendor

Just testing how CI works with this. I tend to prefer vendoring, as it
means that if you have a copy of the code *you can always build it*.
Even if you're 20 years in the future

This is the output of

```
cargo vendor --versioned-dirs
```

6 files changed, 367 insertions, 0 deletions

diff --git a/vendor/proc-macro-nested-0.1.7/.cargo-checksum.json b/vendor/proc-macro-nested-0.1.7/.cargo-checksum.json
new file mode 100644
index 00000000..c7129823
--- /dev/null
+++ b/vendor/proc-macro-nested-0.1.7/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"Cargo.toml":"aa3269bb093b0d25256954f762d878102f57b461841a015d480d6fe656fc434b","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"d59d2723bbc1627b629429a9c779d5dcfde579c9723e6ded1052931c4e8efa0a","build.rs":"94935831bcf86515f37d66a033a7ea394112ccfe7e598cf3b406f0a0e09ad40c","src/lib.rs":"d7be075c69a4d35138d86a4510ec01e5dbf47df8b6b3a0c0d0478d142e248525"},"package":"bc881b2c22681370c6a780e47af9840ef841837bc98118431d4e1868bd0c1086"}
\ No newline at end of file
diff --git a/vendor/proc-macro-nested-0.1.7/Cargo.toml b/vendor/proc-macro-nested-0.1.7/Cargo.toml
new file mode 100644
index 00000000..f7686893
--- /dev/null
+++ b/vendor/proc-macro-nested-0.1.7/Cargo.toml
@@ -0,0 +1,21 @@
+# 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]
+name = "proc-macro-nested"
+version = "0.1.7"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+description = "Support for nested proc-macro-hack invocations"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/dtolnay/proc-macro-hack"
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
diff --git a/vendor/proc-macro-nested-0.1.7/LICENSE-APACHE b/vendor/proc-macro-nested-0.1.7/LICENSE-APACHE
new file mode 100644
index 00000000..16fe87b0
--- /dev/null
+++ b/vendor/proc-macro-nested-0.1.7/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+1. Definitions.
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+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+   whether in tort (including negligence), contract, or otherwise,
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+Copyright [yyyy] [name of copyright owner]
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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
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+
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+Unless required by applicable law or agreed to in writing, software
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diff --git a/vendor/proc-macro-nested-0.1.7/LICENSE-MIT b/vendor/proc-macro-nested-0.1.7/LICENSE-MIT
new file mode 100644
index 00000000..f2675cdf
--- /dev/null
+++ b/vendor/proc-macro-nested-0.1.7/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2018 David Tolnay
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/vendor/proc-macro-nested-0.1.7/build.rs b/vendor/proc-macro-nested-0.1.7/build.rs
new file mode 100644
index 00000000..01dbc0d5
--- /dev/null
+++ b/vendor/proc-macro-nested-0.1.7/build.rs
@@ -0,0 +1,50 @@
+use std::env;
+use std::fs;
+use std::iter;
+use std::path::{self, Path};
+
+/*
+#[doc(hidden)]
+#[macro_export]
+macro_rules! count {
+    () => { proc_macro_call_0!() };
+    (!) => { proc_macro_call_1!() };
+    (!!) => { proc_macro_call_2!() };
+    ...
+}
+*/
+
+fn main() {
+    // Tell Cargo not to rerun on src/lib.rs changes.
+    println!("cargo:rerun-if-changed=build.rs");
+
+    let mut content = String::new();
+    content += "#[doc(hidden)]\n";
+    content += "#[macro_export]\n";
+    content += "macro_rules! count {\n";
+    for i in 0..=64 {
+        let bangs = iter::repeat("!").take(i).collect::<String>();
+        content += &format!("    ({}) => {{ proc_macro_call_{}!() }};\n", bangs, i);
+    }
+    content += "    ($(!)+) => {\n";
+    content += "        compile_error! {\n";
+    content += "            \"this macro does not support >64 nested macro invocations\"\n";
+    content += "        }\n";
+    content += "    };\n";
+    content += "}\n";
+
+    let content = content.as_bytes();
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let ref dest_path = Path::new(&out_dir).join("count.rs");
+
+    // Avoid bumping filetime if content is up to date. Possibly related to
+    // https://github.com/dtolnay/proc-macro-hack/issues/56 ...?
+    if fs::read(dest_path)
+        .map(|existing| existing != content)
+        .unwrap_or(true)
+    {
+        fs::write(dest_path, content).unwrap();
+    }
+
+    println!("cargo:rustc-env=PATH_SEPARATOR={}", path::MAIN_SEPARATOR);
+}
diff --git a/vendor/proc-macro-nested-0.1.7/src/lib.rs b/vendor/proc-macro-nested-0.1.7/src/lib.rs
new file mode 100644
index 00000000..0a8a6750
--- /dev/null
+++ b/vendor/proc-macro-nested-0.1.7/src/lib.rs
@@ -0,0 +1,69 @@
+//! Support for nested invocations of proc-macro-hack expression macros.
+//!
+//! By default, macros defined through proc-macro-hack do not support nested
+//! invocations, i.e. the code emitted by a proc-macro-hack macro invocation
+//! cannot contain recursive calls to the same proc-macro-hack macro nor calls
+//! to any other proc-macro-hack macros.
+//!
+//! This crate provides opt-in support for such nested invocations.
+//!
+//! To make a macro callable recursively, add a dependency on this crate from
+//! your declaration crate and update the `#[proc_macro_hack]` re-export as
+//! follows.
+//!
+//! ```
+//! // Before
+//! # const IGNORE: &str = stringify! {
+//! #[proc_macro_hack]
+//! pub use demo_hack_impl::add_one;
+//! # };
+//! ```
+//!
+//! ```
+//! // After
+//! # const IGNORE: &str = stringify! {
+//! #[proc_macro_hack(support_nested)]
+//! pub use demo_hack_impl::add_one;
+//! # };
+//! ```
+//!
+//! No change is required within your definition crate, only to the re-export in
+//! the declaration crate.
+//!
+//! # Limitations
+//!
+//! - Nested invocations are preprocessed by a TT-muncher, so the caller's crate
+//!   will be required to contain `#![recursion_limit = "..."]` if there are
+//!   lengthy macro invocations.
+//!
+//! - Only up to 64 nested invocations are supported.
+
+#![no_std]
+
+include!(concat!(env!("OUT_DIR"), env!("PATH_SEPARATOR"), "count.rs"));
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! dispatch {
+    (() $($bang:tt)*) => {
+        $crate::count!($($bang)*)
+    };
+    ((($($first:tt)*) $($rest:tt)*) $($bang:tt)*) => {
+        $crate::dispatch!(($($first)* $($rest)*) $($bang)*)
+    };
+    (([$($first:tt)*] $($rest:tt)*) $($bang:tt)*) => {
+        $crate::dispatch!(($($first)* $($rest)*) $($bang)*)
+    };
+    (({$($first:tt)*} $($rest:tt)*) $($bang:tt)*) => {
+        $crate::dispatch!(($($first)* $($rest)*) $($bang)*)
+    };
+    ((! $($rest:tt)*) $($bang:tt)*) => {
+        $crate::dispatch!(($($rest)*) $($bang)* !)
+    };
+    ((!= $($rest:tt)*) $($bang:tt)*) => {
+        $crate::dispatch!(($($rest)*) $($bang)* !)
+    };
+    (($first:tt $($rest:tt)*) $($bang:tt)*) => {
+        $crate::dispatch!(($($rest)*) $($bang)*)
+    };
+}