Switch to rustc-hash

See gfx-rs/rspirv#221 for the rationale behind this change

Cargo.toml

@@ -19,7 +19,7 @@ all-features = true
 bitflags = "1"
 bit-set = "0.5"
 codespan-reporting = { version = "0.11.0", optional = true }
-fxhash = "0.2"
+rustc-hash = "1.1.0"
 indexmap = "1.6" # 1.7 has MSRV 1.49
 log = "0.4"
 num-traits = "0.2"

src/front/spv/mod.rs

@@ -547,7 +547,7 @@ pub struct Parser<I> {
     switch_cases: indexmap::IndexMap<
         spirv::Word,
         (BodyIndex, Vec<i32>),
-        std::hash::BuildHasherDefault<fxhash::FxHasher>,
+        std::hash::BuildHasherDefault<rustc_hash::FxHasher>,
     >,
 
     /// Tracks usage of builtins, used to cull unused builtins since they can

src/lib.rs

@@ -215,11 +215,6 @@ pub mod valid;
 
 pub use crate::arena::{Arena, Handle, Range, UniqueArena};
 
-use std::{
-    collections::{HashMap, HashSet},
-    hash::BuildHasherDefault,
-};
-
 pub use crate::span::{Span, SpanContext, WithSpan};
 #[cfg(feature = "deserialize")]
 use serde::Deserialize;
@@ -230,9 +225,9 @@ use serde::Serialize;
 pub const BOOL_WIDTH: Bytes = 1;
 
 /// Hash map that is faster but not resilient to DoS attacks.
-pub type FastHashMap<K, T> = HashMap<K, T, BuildHasherDefault<fxhash::FxHasher>>;
+pub type FastHashMap<K, T> = rustc_hash::FxHashMap<K, T>;
 /// Hash set that is faster but not resilient to DoS attacks.
-pub type FastHashSet<K> = HashSet<K, BuildHasherDefault<fxhash::FxHasher>>;
+pub type FastHashSet<K> = rustc_hash::FxHashSet<K>;
 
 /// Map of expressions that have associated variable names
 pub(crate) type NamedExpressions = FastHashMap<Handle<Expression>, String>;