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Use a query rather than recomputing the tail repeatedly

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This commit is contained in:
Michael Goulet 2025-03-30 03:40:14 +00:00
parent ccdfd310be
commit 830aeb6102
13 changed files with 234 additions and 90 deletions
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16
compiler/rustc_trait_selection/src/traits/project.rs
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@ -2007,21 +2007,7 @@ fn confirm_impl_candidate<'cx, 'tcx>(
"confirm_impl_candidate: no associated type {:?} for {:?}",
assoc_ty.item.name, obligation.predicate
);
let tail = selcx.tcx().struct_tail_raw(
tcx.type_of(impl_def_id).instantiate(tcx, args),
|ty| {
normalize_with_depth_to(
selcx,
obligation.param_env,
obligation.cause.clone(),
obligation.recursion_depth + 1,
ty,
&mut nested,
)
},
|| {},
);
if tail.is_guaranteed_unsized_raw() {
if tcx.impl_self_is_guaranteed_unsized(impl_def_id) {
// We treat this projection as rigid here, which is represented via
// `Projected::NoProgress`. This will ensure that the projection is
// checked for well-formedness, and it's either satisfied by a trivial