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Rollup merge of #113427 - compiler-errors:no-variances-of-rpitit-gat, r=spastorino

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Remove `variances_of` on RPITIT GATs, remove its one use-case

It doesn't make sense to implement variances on a GAT anyways, since we don't relate GATs with variance:

85bf07972a/compiler/rustc_middle/src/ty/relate.rs (L569-L579)

r? ``@spastorino``
This commit is contained in:
Michael Goulet 2023-07-07 22:12:16 -07:00 • committed by GitHub
commit 751dcaceb4
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2 changed files with 3 additions and 20 deletions
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11
compiler/rustc_infer/src/infer/opaque_types.rs
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@ -473,17 +473,6 @@ where
}
}
ty::Alias(ty::Projection, proj) if self.tcx.is_impl_trait_in_trait(proj.def_id) => {
// Skip lifetime parameters that are not captures.
let variances = self.tcx.variances_of(proj.def_id);
for (v, s) in std::iter::zip(variances, proj.substs.iter()) {
if *v != ty::Variance::Bivariant {
s.visit_with(self);
}
}
}
_ => {
ty.super_visit_with(self);
}