Revert "[rust] Adds heck library for string conversion"

This reverts commit 0ba0701cac105b32e627735bef44405ead8618bd.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> [rust] Adds heck library for string conversion
> 
> OSRB-99
> 
> Change-Id: I4e4eb1ad1e74bee7e471caa462a33dac961062ed

TBR=bwb@google.com,surajmalhotra@google.com

Change-Id: Ie65427f1fb1f8c7476574053ece938977a70cbea
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
diff --git a/rustc_deps/Cargo.lock b/rustc_deps/Cargo.lock
index bdb1828..8039fb9 100644
--- a/rustc_deps/Cargo.lock
+++ b/rustc_deps/Cargo.lock
@@ -509,7 +509,6 @@
  "fuchsia-async-macro 0.1.0",
  "futures-preview 0.3.0-alpha.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "heck 0.3.0 (git+https://github.com/withoutboats/heck)",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.12.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.7.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -699,14 +698,6 @@
 ]
 
 [[package]]
-name = "heck"
-version = "0.3.0"
-source = "git+https://github.com/withoutboats/heck#50f5a5a8ee6e009145ac1b27a27e350157ab238b"
-dependencies = [
- "unicode-segmentation 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "hex"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2021,7 +2012,6 @@
 "checksum getopts 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "0a7292d30132fb5424b354f5dc02512a86e4c516fe544bb7a25e7f266951b797"
 "checksum gzip-header 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2f9e59524a909fe98bb6c6f2cf1f27f2f6772887a496bf4c68cae0d94f884586"
 "checksum h2 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "7dd33bafe2e6370e6c8eb0cf1b8c5f93390b90acde7e9b03723f166b28b648ed"
-"checksum heck 0.3.0 (git+https://github.com/withoutboats/heck)" = "<none>"
 "checksum hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
 "checksum http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "24f58e8c2d8e886055c3ead7b28793e1455270b5fb39650984c224bc538ba581"
 "checksum httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e8734b0cfd3bc3e101ec59100e101c2eecd19282202e87808b3037b442777a83"
diff --git a/rustc_deps/Cargo.toml b/rustc_deps/Cargo.toml
index 3f3f457..da43f18 100644
--- a/rustc_deps/Cargo.toml
+++ b/rustc_deps/Cargo.toml
@@ -25,7 +25,6 @@
 fuchsia-async-macro = "0.1"
 futures-preview = { version = "=0.3.0-alpha.10", features = ["io-compat"] }
 getopts = "0.2"
-heck = { git = "https://github.com/withoutboats/heck" }
 hex = "0.3.2"
 hyper = { version = "0.12.13", default-features = false }
 itertools = "0.7"
diff --git a/rustc_deps/vendor/heck/.cargo-checksum.json b/rustc_deps/vendor/heck/.cargo-checksum.json
deleted file mode 100644
index bc3451d..0000000
--- a/rustc_deps/vendor/heck/.cargo-checksum.json
+++ /dev/null
@@ -1 +0,0 @@
-{"files":{"Cargo.toml":"610ca59afef944896a52f88a0d7e68608779e8cde43ef7fa0d77d5c462412b72","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"7b63ecd5f1902af1b63729947373683c32745c16a10e8e6292e2e2dcd7e90ae0","README.md":"1d4bd09d7b9115fd24bd45b087ff4daace6732f52649fc172bf6f334e147b0e2","no_step_on_snek.png":"186b86731f5f07178c96da78debaeb1dcb9b5e2876a68b05e3f0f14370af4cf2","src/camel.rs":"dec5fe14e4f1a076939c0daeddf4e8769506f383fc2e170fbde49fca5d49c999","src/kebab.rs":"64946c37101b68778151e8bae40250f89dfc783fcfd7e5b221feb34302cd9125","src/lib.rs":"04c53c36cae906c271b741a824a1d8485018df56eeb9a6c77a7807a9690f4b09","src/mixed.rs":"c86480cfb8e541a983144792ecf85fc7bfdde77ea385a4f8b70d1f93b20726d7","src/shouty_snake.rs":"8011a8ce4f701d915c1c1e4264137a2420bf4f55bfc968cf4db251d0fa5e2c2f","src/snake.rs":"6112f7147fe44c260c5ace26bb961dc4bbe12ff01fa87fc91845c0db6a50b60b","src/title.rs":"82887a72ff29b17ef6262ddc85849f194a214d4b9a0c4f7b14fd6b491465d766"},"package":null}
\ No newline at end of file
diff --git a/rustc_deps/vendor/heck/Cargo.toml b/rustc_deps/vendor/heck/Cargo.toml
deleted file mode 100644
index b4a03d2..0000000
--- a/rustc_deps/vendor/heck/Cargo.toml
+++ /dev/null
@@ -1,14 +0,0 @@
-[package]
-authors = ["Without Boats <woboats@gmail.com>"]
-name = "heck"
-version = "0.3.0"
-license = "MIT OR Apache-2.0"
-description = "heck is a case conversion library."
-homepage = "https://github.com/withoutboats/heck"
-repository = "https://github.com/withoutboats/heck"
-documentation = "https://docs.rs/heck"
-keywords = ["string", "case", "camel", "snake", "unicode"]
-readme = "README.md"
-
-[dependencies]
-unicode-segmentation = "1.2.0"
diff --git a/rustc_deps/vendor/heck/LICENSE-APACHE b/rustc_deps/vendor/heck/LICENSE-APACHE
deleted file mode 100644
index 16fe87b..0000000
--- a/rustc_deps/vendor/heck/LICENSE-APACHE
+++ /dev/null
@@ -1,201 +0,0 @@
-                              Apache License
-                        Version 2.0, January 2004
-                     http://www.apache.org/licenses/
-
-TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
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diff --git a/rustc_deps/vendor/heck/LICENSE-MIT b/rustc_deps/vendor/heck/LICENSE-MIT
deleted file mode 100644
index e69282e..0000000
--- a/rustc_deps/vendor/heck/LICENSE-MIT
+++ /dev/null
@@ -1,25 +0,0 @@
-Copyright (c) 2015 The Rust Project Developers
-
-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/rustc_deps/vendor/heck/README.md b/rustc_deps/vendor/heck/README.md
deleted file mode 100644
index cf32337..0000000
--- a/rustc_deps/vendor/heck/README.md
+++ /dev/null
@@ -1,56 +0,0 @@
-# **heck** is a case conversion library
-
-!["I specifically requested the opposite of this."](https://github.com/withoutboats/heck/blob/master/no_step_on_snek.png)
-
-This library exists to provide case conversion between common cases like
-CamelCase and snake_case. It is intended to be unicode aware, internally
-consistent, and reasonably well performing.
-
-## Definition of a word boundary
-
-Word boundaries are defined as the "unicode words" defined in the
-`unicode_segmentation` library, as well as within those words in this manner:
-
-1. All underscore characters are considered word boundaries.
-2. If an uppercase character is followed by lowercase letters, a word boundary
-is considered to be just prior to that uppercase character.
-3. If multiple uppercase characters are consecutive, they are considered to be
-within a single word, except that the last will be part of the next word if it
-is followed by lowercase characters (see rule 2).
-
-That is, "HelloWorld" is segmented `Hello|World` whereas "XMLHttpRequest" is
-segmented `XML|Http|Request`.
-
-Characters not within words (such as spaces, punctuations, and underscores)
-are not included in the output string except as they are a part of the case
-being converted to. Multiple adjacent word boundaries (such as a series of
-underscores) are folded into one. ("hello__world" in snake case is therefore
-"hello_world", not the exact same string). Leading or trailing word boundary
-indicators are dropped, except insofar as CamelCase capitalizes the first word.
-
-### Cases contained in this library:
-
-1. CamelCase
-2. snake_case
-3. kebab-case
-4. SHOUTY_SNAKE_CASE
-5. mixedCase
-6. Title Case
-
-
-### Contributing
-
-PRs of additional well-established cases welcome.
-
-This library is a little bit opinionated (dropping punctuation, for example).
-If that doesn't fit your use case, I hope there is another crate that does. I
-would prefer **not** to receive PRs to make this behavior more configurable.
-
-Bug reports & fixes always welcome. :-)
-
-### License
-
-heck is distributed under the terms of both the MIT license and the
-Apache License (Version 2.0).
-
-See LICENSE-APACHE and LICENSE-MIT for details.
diff --git a/rustc_deps/vendor/heck/no_step_on_snek.png b/rustc_deps/vendor/heck/no_step_on_snek.png
deleted file mode 100644
index 8aff445..0000000
--- a/rustc_deps/vendor/heck/no_step_on_snek.png
+++ /dev/null
Binary files differ
diff --git a/rustc_deps/vendor/heck/src/camel.rs b/rustc_deps/vendor/heck/src/camel.rs
deleted file mode 100644
index 74bd741..0000000
--- a/rustc_deps/vendor/heck/src/camel.rs
+++ /dev/null
@@ -1,52 +0,0 @@
-/// This trait defines a camel case conversion.
-///
-/// In CamelCase, word boundaries are indicated by capital letters, including
-/// the first word.
-///
-/// ## Example:
-///
-/// ```rust
-/// extern crate heck;
-/// fn main() {
-///     
-///     use heck::CamelCase;
-///
-///     let sentence = "We are not in the least afraid of ruins.";
-///     assert_eq!(sentence.to_camel_case(), "WeAreNotInTheLeastAfraidOfRuins");
-/// }
-/// ```
-pub trait CamelCase: ToOwned {
-    /// Convert this type to camel case.
-    fn to_camel_case(&self) -> Self::Owned;
-}
-
-impl CamelCase for str {
-    fn to_camel_case(&self) -> String {
-        ::transform(self, ::capitalize, |_| {})
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::CamelCase;
-
-    macro_rules! t {
-        ($t:ident : $s1:expr => $s2:expr) => {
-            #[test]
-            fn $t() {
-                assert_eq!($s1.to_camel_case(), $s2)
-            }
-        }
-    }
-
-    t!(test1: "CamelCase" => "CamelCase");
-    t!(test2: "This is Human case." => "ThisIsHumanCase");
-    t!(test3: "MixedUP_CamelCase, with some Spaces" => "MixedUpCamelCaseWithSomeSpaces");
-    t!(test4: "mixed_up_ snake_case, with some _spaces" => "MixedUpSnakeCaseWithSomeSpaces");
-    t!(test5: "kebab-case" => "KebabCase");
-    t!(test6: "SHOUTY_SNAKE_CASE" => "ShoutySnakeCase");
-    t!(test7: "snake_case" => "SnakeCase");
-    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "ThisContainsAllKindsOfWordBoundaries");
-    t!(test9: "XΣXΣ baffle" => "XσxςBaffle");
-    t!(test10: "XMLHttpRequest" => "XmlHttpRequest");
-}
diff --git a/rustc_deps/vendor/heck/src/kebab.rs b/rustc_deps/vendor/heck/src/kebab.rs
deleted file mode 100644
index f81ba92..0000000
--- a/rustc_deps/vendor/heck/src/kebab.rs
+++ /dev/null
@@ -1,51 +0,0 @@
-/// This trait defines a kebab case conversion.
-///
-/// In kebab-case, word boundaries are indicated by hyphens.
-///
-/// ## Example:
-///
-/// ```rust
-/// extern crate heck;
-/// fn main() {
-///     
-///     use heck::KebabCase;
-///
-///     let sentence = "We are going to inherit the earth.";
-///     assert_eq!(sentence.to_kebab_case(), "we-are-going-to-inherit-the-earth");
-/// }
-/// ```
-pub trait KebabCase: ToOwned {
-    /// Convert this type to kebab case.
-    fn to_kebab_case(&self) -> Self::Owned;
-}
-
-impl KebabCase for str {
-    fn to_kebab_case(&self) -> Self::Owned {
-        ::transform(self, ::lowercase, |s| s.push('-'))
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::KebabCase;
-
-    macro_rules! t {
-        ($t:ident : $s1:expr => $s2:expr) => {
-            #[test]
-            fn $t() {
-                assert_eq!($s1.to_kebab_case(), $s2)
-            }
-        }
-    }
-
-    t!(test1: "CamelCase" => "camel-case");
-    t!(test2: "This is Human case." => "this-is-human-case");
-    t!(test3: "MixedUP CamelCase, with some Spaces" => "mixed-up-camel-case-with-some-spaces");
-    t!(test4: "mixed_up_ snake_case with some _spaces" => "mixed-up-snake-case-with-some-spaces");
-    t!(test5: "kebab-case" => "kebab-case");
-    t!(test6: "SHOUTY_SNAKE_CASE" => "shouty-snake-case");
-    t!(test7: "snake_case" => "snake-case");
-    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "this-contains-all-kinds-of-word-boundaries");
-    t!(test9: "XΣXΣ baffle" => "xσxς-baffle");
-    t!(test10: "XMLHttpRequest" => "xml-http-request");
-}
diff --git a/rustc_deps/vendor/heck/src/lib.rs b/rustc_deps/vendor/heck/src/lib.rs
deleted file mode 100644
index c35ba34..0000000
--- a/rustc_deps/vendor/heck/src/lib.rs
+++ /dev/null
@@ -1,165 +0,0 @@
-//! **heck** is a case conversion library.
-//!
-//! This library exists to provide case conversion between common cases like
-//! CamelCase and snake_case. It is intended to be unicode aware, internally,
-//! consistent, and reasonably well performing.
-//!
-//! ## Definition of a word boundary
-//!
-//! Word boundaries are defined as the "unicode words" defined in the
-//! `unicode_segmentation` library, as well as within those words in this manner:
-//!
-//! 1. All underscore characters are considered word boundaries.
-//! 2. If an uppercase character is followed by lowercase letters, a word boundary
-//! is considered to be just prior to that uppercase character.
-//! 3. If multiple uppercase characters are consecutive, they are considered to be
-//! within a single word, except that the last will be part of the next word if it
-//! is followed by lowercase characters (see rule 2).
-//!
-//! That is, "HelloWorld" is segmented `Hello|World` whereas "XMLHttpRequest" is
-//! segmented `XML|Http|Request`.
-//!
-//! Characters not within words (such as spaces, punctuations, and underscores)
-//! are not included in the output string except as they are a part of the case
-//! being converted to. Multiple adjacent word boundaries (such as a series of
-//! underscores) are folded into one. ("hello__world" in snake case is therefore
-//! "hello_world", not the exact same string). Leading or trailing word boundary
-//! indicators are dropped, except insofar as CamelCase capitalizes the first word.
-//!
-//! ### Cases contained in this library:
-//!
-//! 1. CamelCase
-//! 2. snake_case
-//! 3. kebab-case
-//! 4. SHOUTY_SNAKE_CASE
-//! 5. mixedCase
-//! 6. Title Case
-#![deny(missing_docs)]
-extern crate unicode_segmentation;
-
-mod camel;
-mod kebab;
-mod mixed;
-mod shouty_snake;
-mod snake;
-mod title;
-
-pub use camel::CamelCase;
-pub use kebab::KebabCase;
-pub use mixed::MixedCase;
-pub use shouty_snake::{ShoutySnakeCase, ShoutySnekCase};
-pub use snake::{SnakeCase, SnekCase};
-pub use title::TitleCase;
-
-use unicode_segmentation::UnicodeSegmentation;
-
-fn transform<F, G>(s: &str, with_word: F, boundary: G) -> String
-where
-    F: Fn(&str, &mut String),
-    G: Fn(&mut String)
-{
-
-    /// Tracks the current 'mode' of the transformation algorithm as it scans the input string.
-    ///
-    /// The mode is a tri-state which tracks the case of the last cased character of the current
-    /// word. If there is no cased character (either lowercase or uppercase) since the previous
-    /// word boundary, than the mode is `Boundary`. If the last cased character is lowercase, then
-    /// the mode is `Lowercase`. Othertherwise, the mode is `Uppercase`.
-    #[derive(Clone, Copy, PartialEq)]
-    enum WordMode {
-        /// There have been no lowercase or uppercase characters in the current word.
-        Boundary,
-        /// The previous cased character in the current word is lowercase.
-        Lowercase,
-        /// The previous cased character in the current word is uppercase.
-        Uppercase,
-    }
-
-    let mut out = String::new();
-    let mut first_word = true;
-
-    for word in s.unicode_words() {
-        let mut char_indices = word.char_indices().peekable();
-        let mut init = 0;
-        let mut mode = WordMode::Boundary;
-
-        while let Some((i, c)) = char_indices.next() {
-            // Skip underscore characters
-            if c == '_' {
-                if init == i { init += 1; }
-                continue
-            }
-
-            if let Some(&(next_i, next)) = char_indices.peek() {
-
-                // The mode including the current character, assuming the current character does
-                // not result in a word boundary.
-                let next_mode = if c.is_lowercase() {
-                    WordMode::Lowercase
-                } else if c.is_uppercase() {
-                    WordMode::Uppercase
-                } else {
-                    mode
-                };
-
-                // Word boundary after if next is underscore or current is
-                // not uppercase and next is uppercase
-                if next == '_' || (next_mode == WordMode::Lowercase && next.is_uppercase()) {
-                    if !first_word { boundary(&mut out); }
-                    with_word(&word[init..next_i], &mut out);
-                    first_word = false;
-                    init = next_i;
-                    mode = WordMode::Boundary;
-
-                // Otherwise if current and previous are uppercase and next
-                // is lowercase, word boundary before
-                } else if mode == WordMode::Uppercase && c.is_uppercase() && next.is_lowercase() {
-                    if !first_word { boundary(&mut out); }
-                    else { first_word = false; }
-                    with_word(&word[init..i], &mut out);
-                    init = i;
-                    mode = WordMode::Boundary;
-
-                // Otherwise no word boundary, just update the mode
-                } else {
-                    mode = next_mode;
-                }
-            } else {
-                // Collect trailing characters as a word
-                if !first_word { boundary(&mut out); }
-                else { first_word = false; }
-                with_word(&word[init..], &mut out);
-                break;
-            }
-        }
-    }
-
-    out
-}
-
-fn lowercase(s: &str, out: &mut String) {
-    let mut chars = s.chars().peekable();
-    while let Some(c) = chars.next() {
-        if c == 'Σ' && chars.peek().is_none() {
-            out.push('ς');
-        } else {
-            out.extend(c.to_lowercase());
-        }
-    }
-}
-
-fn uppercase(s: &str, out: &mut String ) {
-    for c in s.chars() {
-        out.extend(c.to_uppercase())
-    }
-}
-
-fn capitalize(s: &str, out: &mut String) {
-    let mut char_indices = s.char_indices();
-    if let Some((_, c)) = char_indices.next() {
-        out.extend(c.to_uppercase());
-        if let Some((i, _)) = char_indices.next() {
-            lowercase(&s[i..], out);
-        }
-    }
-}
diff --git a/rustc_deps/vendor/heck/src/mixed.rs b/rustc_deps/vendor/heck/src/mixed.rs
deleted file mode 100644
index 7736684..0000000
--- a/rustc_deps/vendor/heck/src/mixed.rs
+++ /dev/null
@@ -1,56 +0,0 @@
-/// This trait defines a mixed case conversion.
-///
-/// In mixedCase, word boundaries are indicated by capital letters, excepting
-/// the first word.
-///
-/// ## Example:
-///
-/// ```rust
-/// extern crate heck;
-/// fn main() {
-///     
-///     use heck::MixedCase;
-///
-///     let sentence = "It is we who built these palaces and cities.";
-///     assert_eq!(sentence.to_mixed_case(), "itIsWeWhoBuiltThesePalacesAndCities");
-/// }
-/// ```
-pub trait MixedCase: ToOwned {
-    /// Convert this type to mixed case.
-    fn to_mixed_case(&self) -> Self::Owned;
-}
-
-impl MixedCase for str {
-    fn to_mixed_case(&self) -> String {
-        ::transform(self, |s, out| {
-            if out.is_empty() { ::lowercase(s, out); }
-            else { ::capitalize(s, out) }
-        }, |_| {})
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::MixedCase;
-
-    macro_rules! t {
-        ($t:ident : $s1:expr => $s2:expr) => {
-            #[test]
-            fn $t() {
-                assert_eq!($s1.to_mixed_case(), $s2)
-            }
-        }
-    }
-
-    t!(test1: "CamelCase" => "camelCase");
-    t!(test2: "This is Human case." => "thisIsHumanCase");
-    t!(test3: "MixedUP CamelCase, with some Spaces" => "mixedUpCamelCaseWithSomeSpaces");
-    t!(test4: "mixed_up_ snake_case, with some _spaces" => "mixedUpSnakeCaseWithSomeSpaces");
-    t!(test5: "kebab-case" => "kebabCase");
-    t!(test6: "SHOUTY_SNAKE_CASE" => "shoutySnakeCase");
-    t!(test7: "snake_case" => "snakeCase");
-    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "thisContainsAllKindsOfWordBoundaries");
-    t!(test9: "XΣXΣ baffle" => "xσxςBaffle");
-    t!(test10: "XMLHttpRequest" => "xmlHttpRequest");
-    // TODO unicode tests
-}
diff --git a/rustc_deps/vendor/heck/src/shouty_snake.rs b/rustc_deps/vendor/heck/src/shouty_snake.rs
deleted file mode 100644
index 0f846c3..0000000
--- a/rustc_deps/vendor/heck/src/shouty_snake.rs
+++ /dev/null
@@ -1,67 +0,0 @@
-/// This trait defines a shouty snake case conversion.
-///
-/// In SHOUTY_SNAKE_CASE, word boundaries are indicated by underscores and all
-/// words are in uppercase.
-///
-/// ## Example:
-///
-/// ```rust
-/// extern crate heck;
-/// fn main() {
-///     
-///     use heck::ShoutySnakeCase;
-///
-///     let sentence = "That world is growing in this minute.";
-///     assert_eq!(sentence.to_shouty_snake_case(), "THAT_WORLD_IS_GROWING_IN_THIS_MINUTE");
-/// }
-/// ```
-pub trait ShoutySnakeCase: ToOwned {
-    /// Convert this type to shouty snake case.
-    fn to_shouty_snake_case(&self) -> Self::Owned;
-}
-
-/// Oh heck, ShoutySnekCase is an alias for ShoutySnakeCase. See ShoutySnakeCase for
-/// more documentation.
-pub trait ShoutySnekCase: ToOwned {
-    /// CONVERT THIS TYPE TO SNEK CASE.
-    #[allow(non_snake_case)]
-    fn TO_SHOUTY_SNEK_CASE(&self) -> Self::Owned;
-}
-
-impl<T: ?Sized + ShoutySnakeCase> ShoutySnekCase for T {
-    fn TO_SHOUTY_SNEK_CASE(&self) -> Self::Owned {
-        self.to_shouty_snake_case()
-    }
-}
-
-
-impl ShoutySnakeCase for str {
-    fn to_shouty_snake_case(&self) -> Self::Owned {
-        ::transform(self, ::uppercase, |s| s.push('_'))
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::ShoutySnakeCase;
-
-    macro_rules! t {
-        ($t:ident : $s1:expr => $s2:expr) => {
-            #[test]
-            fn $t() {
-                assert_eq!($s1.to_shouty_snake_case(), $s2)
-            }
-        }
-    }
-
-    t!(test1: "CamelCase" => "CAMEL_CASE");
-    t!(test2: "This is Human case." => "THIS_IS_HUMAN_CASE");
-    t!(test3: "MixedUP CamelCase, with some Spaces" => "MIXED_UP_CAMEL_CASE_WITH_SOME_SPACES");
-    t!(test4: "mixed_up_snake_case with some _spaces" => "MIXED_UP_SNAKE_CASE_WITH_SOME_SPACES");
-    t!(test5: "kebab-case" => "KEBAB_CASE");
-    t!(test6: "SHOUTY_SNAKE_CASE" => "SHOUTY_SNAKE_CASE");
-    t!(test7: "snake_case" => "SNAKE_CASE");
-    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "THIS_CONTAINS_ALL_KINDS_OF_WORD_BOUNDARIES");
-    t!(test9: "XΣXΣ baffle" => "XΣXΣ_BAFFLE");
-    t!(test10: "XMLHttpRequest" => "XML_HTTP_REQUEST");
-}
diff --git a/rustc_deps/vendor/heck/src/snake.rs b/rustc_deps/vendor/heck/src/snake.rs
deleted file mode 100644
index 86c3756..0000000
--- a/rustc_deps/vendor/heck/src/snake.rs
+++ /dev/null
@@ -1,79 +0,0 @@
-/// This trait defines a camel case conversion.
-///
-/// In snake_case, word boundaries are indicated by underscores.
-///
-/// ## Example:
-///
-/// ```rust
-/// extern crate heck;
-/// fn main() {
-///
-///     use heck::SnakeCase;
-///
-///     let sentence = "We carry a new world here, in our hearts.";
-///     assert_eq!(sentence.to_snake_case(), "we_carry_a_new_world_here_in_our_hearts");
-/// }
-/// ```
-pub trait SnakeCase: ToOwned {
-    /// Convert this type to snake case.
-    fn to_snake_case(&self) -> Self::Owned;
-}
-
-/// Oh heck, SnekCase is an alias for SnakeCase. See SnakeCase for
-/// more documentation.
-pub trait SnekCase: ToOwned {
-    /// Convert this type to snek case.
-    fn to_snek_case(&self) -> Self::Owned;
-}
-
-impl<T: ?Sized + SnakeCase> SnekCase for T {
-    fn to_snek_case(&self) -> Self::Owned {
-        self.to_snake_case()
-    }
-}
-
-impl SnakeCase for str {
-    fn to_snake_case(&self) -> String {
-        ::transform(self, ::lowercase, |s| s.push('_'))
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::SnakeCase;
-
-    macro_rules! t {
-        ($t:ident : $s1:expr => $s2:expr) => {
-            #[test]
-            fn $t() {
-                assert_eq!($s1.to_snake_case(), $s2)
-            }
-        }
-    }
-
-    t!(test1: "CamelCase" => "camel_case");
-    t!(test2: "This is Human case." => "this_is_human_case");
-    t!(test3: "MixedUP CamelCase, with some Spaces" => "mixed_up_camel_case_with_some_spaces");
-    t!(test4: "mixed_up_ snake_case with some _spaces" => "mixed_up_snake_case_with_some_spaces");
-    t!(test5: "kebab-case" => "kebab_case");
-    t!(test6: "SHOUTY_SNAKE_CASE" => "shouty_snake_case");
-    t!(test7: "snake_case" => "snake_case");
-    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "this_contains_all_kinds_of_word_boundaries");
-    t!(test9: "XΣXΣ baffle" => "xσxς_baffle");
-    t!(test10: "XMLHttpRequest" => "xml_http_request");
-    t!(test11: "FIELD_NAME11" => "field_name11");
-    t!(test12: "99BOTTLES" => "99bottles");
-    t!(test13: "FieldNamE11" => "field_nam_e11");
-
-    t!(test14: "abc123def456" => "abc123def456");
-    t!(test16: "abc123DEF456" => "abc123_def456");
-    t!(test17: "abc123Def456" => "abc123_def456");
-    t!(test18: "abc123DEf456" => "abc123_d_ef456");
-    t!(test19: "ABC123def456" => "abc123def456");
-    t!(test20: "ABC123DEF456" => "abc123def456");
-    t!(test21: "ABC123Def456" => "abc123_def456");
-    t!(test22: "ABC123DEf456" => "abc123d_ef456");
-    t!(test23: "ABC123dEEf456FOO" => "abc123d_e_ef456_foo");
-    t!(test24: "abcDEF" => "abc_def");
-    t!(test25: "ABcDE" => "a_bc_de");
-}
diff --git a/rustc_deps/vendor/heck/src/title.rs b/rustc_deps/vendor/heck/src/title.rs
deleted file mode 100644
index cb48302..0000000
--- a/rustc_deps/vendor/heck/src/title.rs
+++ /dev/null
@@ -1,52 +0,0 @@
-/// This trait defines a title case conversion.
-///
-/// In Title Case, word boundaries are indicated by spaces, and every word is
-/// capitalized.
-///
-/// ## Example:
-///
-/// ```rust
-/// extern crate heck;
-/// fn main() {
-///     
-///     use heck::TitleCase;
-///
-///     let sentence = "We have always lived in slums and holes in the wall.";
-///     assert_eq!(sentence.to_title_case(), "We Have Always Lived In Slums And Holes In The Wall");
-/// }
-/// ```
-pub trait TitleCase: ToOwned {
-    /// Convert this type to title case.
-    fn to_title_case(&self) -> Self::Owned;
-}
-
-impl TitleCase for str {
-    fn to_title_case(&self) -> String {
-        ::transform(self, ::capitalize, |s| s.push(' '))
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::TitleCase;
-
-    macro_rules! t {
-        ($t:ident : $s1:expr => $s2:expr) => {
-            #[test]
-            fn $t() {
-                assert_eq!($s1.to_title_case(), $s2)
-            }
-        }
-    }
-
-    t!(test1: "CamelCase" => "Camel Case");
-    t!(test2: "This is Human case." => "This Is Human Case");
-    t!(test3: "MixedUP CamelCase, with some Spaces" => "Mixed Up Camel Case With Some Spaces");
-    t!(test4: "mixed_up_ snake_case, with some _spaces" => "Mixed Up Snake Case With Some Spaces");
-    t!(test5: "kebab-case" => "Kebab Case");
-    t!(test6: "SHOUTY_SNAKE_CASE" => "Shouty Snake Case");
-    t!(test7: "snake_case" => "Snake Case");
-    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "This Contains All Kinds Of Word Boundaries");
-    t!(test9: "XΣXΣ baffle" => "Xσxς Baffle");
-    t!(test10: "XMLHttpRequest" => "Xml Http Request");
-}