perf: switch to ahash, indexmap-allocator-api

parser/Cargo.toml

@@ -14,6 +14,7 @@ smallvec.workspace = true
 bumpalo.workspace = true
 hashbrown.workspace = true
 allocator-api2.workspace = true
+ahash.workspace = true
 ariadne = "0.6.0"
 
 [lints]

parser/src/ast.rs

@@ -5,9 +5,10 @@
 
 use std::fmt::Debug;
 
+use ahash::RandomState;
 use bumpalo::{Bump, boxed::Box, collections::Vec};
 use either::Either;
-use hashbrown::{DefaultHashBuilder, HashMap};
+use hashbrown::HashMap;
 use lexer::{Slice, Span, Token};
 
 use crate::{ParsingError, Result, lex::TokenExt};
@@ -21,7 +22,7 @@ pub struct Ast<'a> {
     pub end_file: Vec<'a, Body<'a>>,
     pub rules: Vec<'a, Rule<'a>>,
     pub concurrent: Vec<'a, Rule<'a>>,
-    pub functions: HashMap<Identifier<'a>, Function<'a>, DefaultHashBuilder, &'a Bump>,
+    pub functions: HashMap<Identifier<'a>, Function<'a>, RandomState, &'a Bump>,
 }
 
 #[derive(Debug)]

parser/src/lib.rs

@@ -16,6 +16,7 @@ mod tests;
 
 use std::{fmt::Debug, mem::replace};
 
+use ahash::RandomState;
 use bumpalo::{Bump, boxed::Box, collections::Vec, vec};
 use either::Either::{Left, Right};
 use hashbrown::HashMap;
@@ -685,7 +686,7 @@ impl<'a> Ast<'a> {
             end_file: Vec::new_in(arena),
             rules: Vec::new_in(arena),
             concurrent: Vec::new_in(arena),
-            functions: HashMap::new_in(arena),
+            functions: HashMap::with_hasher_in(RandomState::new(), arena),
         }
     }
 }