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Get rid of some walk_mut uses

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This commit is contained in:
Florian Diebold 2021-04-05 18:54:31 +02:00
parent 30a339e038
commit e28f0c98ba
2 changed files with 15 additions and 10 deletions
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15
crates/hir_ty/src/infer/unify.rs
View File

@ -108,19 +108,22 @@ impl<'a, 'b> Canonicalizer<'a, 'b> {
}
impl<T> Canonicalized<T> {
pub(super) fn decanonicalize_ty(&self, mut ty: Ty) -> Ty {
ty.walk_mut_binders(
pub(super) fn decanonicalize_ty(&self, ty: Ty) -> Ty {
ty.fold_binders(
&mut |ty, binders| {
if let &mut TyKind::BoundVar(bound) = ty.interned_mut() {
if let TyKind::BoundVar(bound) = ty.kind(&Interner) {
if bound.debruijn >= binders {
let (v, k) = self.free_vars[bound.index];
*ty = TyKind::InferenceVar(v, k).intern(&Interner);
TyKind::InferenceVar(v, k).intern(&Interner)
} else {
ty
}
} else {
ty
}
},
DebruijnIndex::INNERMOST,
);
ty
)
}
pub(super) fn apply_solution(

10
crates/hir_ty/src/lower.rs
View File

@ -1011,17 +1011,19 @@ pub(crate) fn generic_defaults_query(
p.default.as_ref().map_or(TyKind::Error.intern(&Interner), |t| ctx.lower_ty(t));
// Each default can only refer to previous parameters.
ty.walk_mut_binders(
&mut |ty, binders| match ty.interned_mut() {
ty = ty.fold_binders(
&mut |ty, binders| match ty.kind(&Interner) {
TyKind::BoundVar(BoundVar { debruijn, index }) if *debruijn == binders => {
if *index >= idx {
// type variable default referring to parameter coming
// after it. This is forbidden (FIXME: report
// diagnostic)
*ty = TyKind::Error.intern(&Interner);
TyKind::Error.intern(&Interner)
} else {
ty
}
}
_ => {}
_ => ty,
},
DebruijnIndex::INNERMOST,
);