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Fix region and save an alloc

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This commit is contained in:
Ayaz Hafiz 2022-04-24 10:25:32 -04:00
parent cd89902e7a
commit f94d91b8ab
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GPG key ID: 0E2A37416A25EF58
1 changed files with 7 additions and 17 deletions
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24
compiler/constrain/src/expr.rs
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@ -652,17 +652,14 @@ pub fn constrain_expr(
let mut branch_cons = Vec::with_capacity(branches.len());
for (index, when_branch) in branches.iter().enumerate() {
let pattern_region =
Region::across_all(when_branch.patterns.iter().map(|v| &v.region));
let expected_pattern = |sub_pattern| {
let expected_pattern = |sub_pattern, sub_region| {
PExpected::ForReason(
PReason::WhenMatch {
index: HumanIndex::zero_based(index),
sub_pattern,
},
cond_type.clone(),
pattern_region,
sub_region,
)
};
@ -702,9 +699,6 @@ pub fn constrain_expr(
//
// The return type of each branch must equal the return type of
// the entire when-expression.
// branch_cons.extend(pattern_cons);
// branch_constraints.push(constraints.and_constraint(pattern_cons));
let mut total_cons = Vec::with_capacity(2);
// After solving the condition variable with what's expected from the branch patterns,
// check it against the condition expression.
@ -731,15 +725,11 @@ pub fn constrain_expr(
pattern_constraints,
body_constraints,
);
total_cons.push(when_body_con);
total_cons.push(constraints.equal_types_var(
branch_var,
expected,
Category::When,
region,
));
let result_con =
constraints.equal_types_var(branch_var, expected, Category::When, region);
let total_cons = [when_body_con, result_con];
let branch_constraints = constraints.and_constraint(total_cons);
// exhautiveness checking happens when converting to mono::Expr
@ -1141,7 +1131,7 @@ fn constrain_when_branch_help(
env: &Env,
region: Region,
when_branch: &WhenBranch,
pattern_expected: impl Fn(HumanIndex) -> PExpected<Type>,
pattern_expected: impl Fn(HumanIndex, Region) -> PExpected<Type>,
expr_expected: Expected<Type>,
) -> (
Vec<Variable>,
@ -1167,7 +1157,7 @@ fn constrain_when_branch_help(
// TODO investigate for error messages, is it better to unify all branches with a variable,
// then unify that variable with the expectation?
for (i, loc_pattern) in when_branch.patterns.iter().enumerate() {
let pattern_expected = pattern_expected(HumanIndex::zero_based(i));
let pattern_expected = pattern_expected(HumanIndex::zero_based(i), loc_pattern.region);
constrain_pattern(
constraints,