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Rollup merge of #109198 - compiler-errors:new-rpitit-default-body, r=spastorino

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Install projection from RPITIT to default trait method opaque correctly

1. For new lowering strategy `-Zlower-impl-trait-in-trait-to-assoc-ty`, install the correct default trait method projection predicates (RPITIT -> opaque). This makes default trait body tests pass!

2. Fix two WF-checking bugs -- first, we want to make sure that we're always looking for an opaque type in `check_return_position_impl_trait_in_trait_bounds`. That's because the RPITIT projections are normalized to opaques during wfcheck. Second, fix RPITIT's param-envs by not adding the projection predicates that we install on trait methods to make default RPITITs work -- I left a comment why.

3. Also, just a small drive-by for `rustc_on_unimplemented`. Not sure if it affects any tests, but can't hurt.

r? ````@spastorino,```` based off of #109140
This commit is contained in:
Matthias Krüger 2023-03-17 08:42:40 +01:00 • committed by GitHub
commit 246d989a30
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compiler/rustc_middle/src/query/mod.rs
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@ -191,6 +191,7 @@ rustc_queries! {
{
desc { "determine whether the opaque is a type-alias impl trait" }
separate_provide_extern
feedable
}
query unsizing_params_for_adt(key: DefId) -> &'tcx rustc_index::bit_set::BitSet<u32>