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optimize variable substitution in instantiate_rigids

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Folkert 2022-03-21 20:18:18 +01:00
parent 4c37b6f5fb
commit dfa5710932
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1 changed files with 4 additions and 4 deletions
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8
compiler/constrain/src/expr.rs
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@ -10,7 +10,7 @@ use roc_can::expected::PExpected;
use roc_can::expr::Expr::{self, *};
use roc_can::expr::{AccessorData, ClosureData, Field, WhenBranch};
use roc_can::pattern::Pattern;
use roc_collections::all::{HumanIndex, ImMap, MutMap, SendMap};
use roc_collections::all::{HumanIndex, MutMap, SendMap};
use roc_module::ident::{Lowercase, TagName};
use roc_module::symbol::{ModuleId, Symbol};
use roc_region::all::{Loc, Region};
@ -1670,14 +1670,14 @@ fn instantiate_rigids(
let mut annotation = annotation.clone();
let mut new_rigid_variables: Vec<Variable> = Vec::new();
let mut rigid_substitution: ImMap<Variable, Type> = ImMap::default();
let mut rigid_substitution: MutMap<Variable, Variable> = MutMap::default();
for named in introduced_vars.named.iter() {
use std::collections::hash_map::Entry::*;
match ftv.entry(named.name.clone()) {
Occupied(occupied) => {
let existing_rigid = occupied.get();
rigid_substitution.insert(named.variable, Type::Variable(*existing_rigid));
rigid_substitution.insert(named.variable, *existing_rigid);
}
Vacant(vacant) => {
// It's possible to use this rigid in nested defs
@ -1698,7 +1698,7 @@ fn instantiate_rigids(
// Instantiate rigid variables
if !rigid_substitution.is_empty() {
annotation.substitute(&rigid_substitution);
annotation.substitute_variables(&rigid_substitution);
}
// TODO investigate when we can skip this. It seems to only be required for correctness