Revert "Switch to hashbrown."

This reverts commit 8a579b134dbaf369803cffbe835ba14ab2765fba.

Reason for revert: hashbrown made it to libstd, so this saves some dependencies.

3 files changed, 17 insertions, 24 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 675a5bf2..77e0534a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -34,7 +34,7 @@ dependencies = [
  "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -58,7 +58,7 @@ dependencies = [
  "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "diff 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "hashbrown 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "peeking_take_while 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -147,20 +147,19 @@ dependencies = [
 ]
 
 [[package]]
-name = "glob"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "hashbrown"
-version = "0.1.7"
+name = "fxhash"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
+name = "glob"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "humantime"
 version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -277,12 +276,7 @@ dependencies = [
 
 [[package]]
 name = "rustc-demangle"
-version = "0.1.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "scopeguard"
-version = "0.3.3"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -420,8 +414,8 @@ dependencies = [
 "checksum diff 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "3c2b69f912779fbb121ceb775d74d51e915af17aaebc38d28a592843a2dd0a3a"
 "checksum env_logger 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "afb070faf94c85d17d50ca44f6ad076bce18ae92f0037d350947240a36e9d42e"
 "checksum failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "795bd83d3abeb9220f257e597aa0080a508b27533824adf336529648f6abf7e2"
+"checksum fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c31b6d751ae2c7f11320402d34e41349dd1016f8d5d45e48c4312bc8625af50c"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
-"checksum hashbrown 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "64b7d419d0622ae02fe5da6b9a5e1964b610a65bb37923b976aeebb6dbb8f86e"
 "checksum humantime 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0484fda3e7007f2a4a0d9c3a703ca38c71c54c55602ce4660c419fd32e188c9e"
 "checksum lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca488b89a5657b0a2ecd45b95609b3e848cf1755da332a0da46e2b2b1cb371a7"
 "checksum libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)" = "76e3a3ef172f1a0b9a9ff0dd1491ae5e6c948b94479a3021819ba7d860c8645d"
@@ -437,8 +431,7 @@ dependencies = [
 "checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
 "checksum regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "2069749032ea3ec200ca51e4a31df41759190a88edca0d2d86ee8bedf7073341"
 "checksum regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "747ba3b235651f6e2f67dfa8bcdcd073ddb7c243cb21c442fc12395dfcac212d"
-"checksum rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "adacaae16d02b6ec37fdc7acfcddf365978de76d1983d3ee22afc260e1ca9619"
-"checksum scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "94258f53601af11e6a49f722422f6e3425c52b06245a5cf9bc09908b174f5e27"
+"checksum rustc-demangle 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "ccc78bfd5acd7bf3e89cffcf899e5cb1a52d6fafa8dec2739ad70c9577a57288"
 "checksum shlex 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
 "checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
 "checksum termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4096add70612622289f2fdcdbd5086dc81c1e2675e6ae58d6c4f62a16c6d7f2f"
diff --git a/Cargo.toml b/Cargo.toml
index c14e93f3..02ddb246 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -54,8 +54,8 @@ peeking_take_while = "0.1.2"
 quote = { version = "0.6", default-features = false }
 regex = "1.0"
 which = ">=1.0, <3.0"
-hashbrown = "0.1"
 shlex = "0.1"
+fxhash = "0.2"
 # New validation in 0.3.6 breaks bindgen-integration:
 # https://github.com/alexcrichton/proc-macro2/commit/489c642.
 proc-macro2 = { version = "0.4", default-features = false }
diff --git a/src/lib.rs b/src/lib.rs
index fb30d35c..45944c1d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -23,7 +23,7 @@ extern crate cexpr;
 #[allow(unused_extern_crates)]
 extern crate cfg_if;
 extern crate clang_sys;
-extern crate hashbrown;
+extern crate fxhash;
 #[macro_use]
 extern crate lazy_static;
 extern crate peeking_take_while;
@@ -98,9 +98,9 @@ use std::process::{Command, Stdio};
 use std::sync::Arc;
 
 // Some convenient typedefs for a fast hash map and hash set.
-type HashMap<K, V> = ::hashbrown::HashMap<K, V>;
-type HashSet<K> = ::hashbrown::HashSet<K>;
-pub(crate) use ::hashbrown::hash_map::Entry;
+type HashMap<K, V> = ::fxhash::FxHashMap<K, V>;
+type HashSet<K> = ::fxhash::FxHashSet<K>;
+pub(crate) use ::std::collections::hash_map::Entry;
 
 fn args_are_cpp(clang_args: &[String]) -> bool {
     return clang_args