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Rollup merge of #93892 - compiler-errors:issue-92917, r=jackh726,nikomatsakis

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Only mark projection as ambiguous if GAT substs are constrained

A slightly more targeted version of #92917, where we only give up with ambiguity if we infer something about the GATs substs when probing for a projection candidate.

fixes #93874
also note (but like the previous PR, does not fix) #91762

r? `@jackh726`
cc `@nikomatsakis` who reviewed #92917
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Matthias Krüger 2022-02-18 23:23:09 +01:00 • committed by GitHub
commit 1e2f63de0a
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6 changed files with 100 additions and 43 deletions
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2
compiler/rustc_infer/src/infer/type_variable.rs
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@ -263,7 +263,7 @@ impl<'tcx> TypeVariableTable<'_, 'tcx> {
let index = self.values().push(TypeVariableData { origin });
assert_eq!(eq_key.vid.as_u32(), index as u32);
debug!("new_var(index={:?}, universe={:?}, origin={:?}", eq_key.vid, universe, origin,);
debug!("new_var(index={:?}, universe={:?}, origin={:?})", eq_key.vid, universe, origin);
eq_key.vid
}