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Check patterns for type match recursively.

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This commit is contained in:
Dawer 2021-05-19 10:57:10 +05:00
parent 472317c008
commit e2b1c69f74
2 changed files with 30 additions and 2 deletions
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20
crates/hir_ty/src/diagnostics/expr.rs
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@ -311,11 +311,12 @@ impl<'a, 'b> ExprValidator<'a, 'b> {
// necessary.
//
// FIXME we should use the type checker for this.
if pat_ty == match_expr_ty
if (pat_ty == match_expr_ty
|| match_expr_ty
.as_reference()
.map(|(match_expr_ty, ..)| match_expr_ty == pat_ty)
.unwrap_or(false)
.unwrap_or(false))
&& types_of_subpatterns_do_match(pat, &cx.body, &infer)
{
// If we had a NotUsefulMatchArm diagnostic, we could
// check the usefulness of each pattern as we added it
@ -496,6 +497,21 @@ pub fn record_pattern_missing_fields(
Some((variant_def, missed_fields, exhaustive))
}
fn types_of_subpatterns_do_match(pat: PatId, body: &Body, infer: &InferenceResult) -> bool {
fn walk(pat: PatId, body: &Body, infer: &InferenceResult, has_type_mismatches: &mut bool) {
match infer.type_mismatch_for_pat(pat) {
Some(_) => *has_type_mismatches = true,
None => {
body[pat].walk_child_pats(|subpat| walk(subpat, body, infer, has_type_mismatches))
}
}
}
let mut has_type_mismatches = false;
walk(pat, body, infer, &mut has_type_mismatches);
!has_type_mismatches
}
#[cfg(test)]
mod tests {
use crate::diagnostics::tests::check_diagnostics;