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fix: Properly prevent mir building with unknown types present

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This commit is contained in:
Lukas Wirth 2024-09-06 14:44:05 +02:00
parent fdac69e4ae
commit 7c5275939a
3 changed files with 14 additions and 5 deletions
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13
crates/hir-ty/src/infer.rs
View file

@ -708,7 +708,6 @@ impl<'a> InferenceContext<'a> {
tuple_field_access_types: _,
coercion_casts,
} = &mut result;
table.fallback_if_possible();
// Comment from rustc:
@ -754,7 +753,7 @@ impl<'a> InferenceContext<'a> {
*has_errors = *has_errors || ty.contains_unknown();
}
*has_errors = !type_mismatches.is_empty();
*has_errors |= !type_mismatches.is_empty();
type_mismatches.retain(|_, mismatch| {
mismatch.expected = table.resolve_completely(mismatch.expected.clone());
@ -797,20 +796,30 @@ impl<'a> InferenceContext<'a> {
});
for (_, subst) in method_resolutions.values_mut() {
*subst = table.resolve_completely(subst.clone());
*has_errors =
*has_errors || subst.type_parameters(Interner).any(|ty| ty.contains_unknown());
}
for (_, subst) in assoc_resolutions.values_mut() {
*subst = table.resolve_completely(subst.clone());
*has_errors =
*has_errors || subst.type_parameters(Interner).any(|ty| ty.contains_unknown());
}
for adjustment in expr_adjustments.values_mut().flatten() {
adjustment.target = table.resolve_completely(adjustment.target.clone());
*has_errors = *has_errors || adjustment.target.contains_unknown();
}
for adjustment in pat_adjustments.values_mut().flatten() {
*adjustment = table.resolve_completely(adjustment.clone());
*has_errors = *has_errors || adjustment.contains_unknown();
}
result.tuple_field_access_types = tuple_field_accesses_rev
.into_iter()
.enumerate()
.map(|(idx, subst)| (TupleId(idx as u32), table.resolve_completely(subst)))
.inspect(|(_, subst)| {
*has_errors =
*has_errors || subst.type_parameters(Interner).any(|ty| ty.contains_unknown());
})
.collect();
result
}

4
crates/hir-ty/src/mir.rs
View file

@ -185,8 +185,8 @@ impl<V, T> ProjectionElem<V, T> {
never!("Out of bound tuple field");
TyKind::Error.intern(Interner)
}),
_ => {
never!("Only tuple has tuple field");
ty => {
never!("Only tuple has tuple field: {:?}", ty);
TyKind::Error.intern(Interner)
}
},

2
crates/ide-diagnostics/src/handlers/mutability_errors.rs
View file

@ -824,13 +824,13 @@ fn f() {
#[test]
fn or_pattern() {
// FIXME: `None` is inferred as unknown here for some reason
check_diagnostics(
r#"
//- minicore: option
fn f(_: i32) {}
fn main() {
let ((Some(mut x), None) | (_, Some(mut x))) = (None, Some(7)) else { return };
//^^^^^ 💡 warn: variable does not need to be mutable
f(x);
}
"#,