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Auto merge of #103509 - compiler-errors:opaques-w-bound-vars-r-hard, r=oli-obk

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Revert "Normalize opaques with escaping bound vars"

This caused a perf regression in #103423, cc `@skyzh` this should fix #103423.

reverts #100980

r? `@oli-obk`
This commit is contained in:
bors 2022-11-19 09:30:35 +00:00
commit 5e6de2369c
5 changed files with 49 additions and 26 deletions
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2
compiler/rustc_trait_selection/src/traits/project.rs
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@ -508,7 +508,7 @@ impl<'a, 'b, 'tcx> TypeFolder<'tcx> for AssocTypeNormalizer<'a, 'b, 'tcx> {
// This is really important. While we *can* handle this, this has
// severe performance implications for large opaque types with
// late-bound regions. See `issue-88862` benchmark.
ty::Opaque(def_id, substs) => {
ty::Opaque(def_id, substs) if !substs.has_escaping_bound_vars() => {
// Only normalize `impl Trait` outside of type inference, usually in codegen.
match self.param_env.reveal() {
Reveal::UserFacing => ty.super_fold_with(self),

2
compiler/rustc_trait_selection/src/traits/query/normalize.rs
View file

@ -198,7 +198,7 @@ impl<'cx, 'tcx> FallibleTypeFolder<'tcx> for QueryNormalizer<'cx, 'tcx> {
// This is really important. While we *can* handle this, this has
// severe performance implications for large opaque types with
// late-bound regions. See `issue-88862` benchmark.
ty::Opaque(def_id, substs) => {
ty::Opaque(def_id, substs) if !substs.has_escaping_bound_vars() => {
// Only normalize `impl Trait` outside of type inference, usually in codegen.
match self.param_env.reveal() {
Reveal::UserFacing => ty.try_super_fold_with(self),