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Matthias Krüger 8ddc0df1f1
Rollup merge of #116219 - compiler-errors:relate-alias-ty-with-variance, r=lcnr 
Relate alias ty with variance

In the new solver, turns out that the subst-relate branch of the alias-relate predicate was relating args invariantly even for opaques, which have variance 💀.

This change is a bit more invasive, but I'd rather not special-case it [here](aeaa5c30e5/compiler/rustc_trait_selection/src/solve/alias_relate.rs (L171-L190)) and then have it break elsewhere. I'm doing a perf run to see if the extra call to `def_kind` is that expensive, if it is, I'll reconsider.

r? ``@lcnr``
2023-10-11 20:08:20 +02:00
..
src Rollup merge of #116219 - compiler-errors:relate-alias-ty-with-variance, r=lcnr 2023-10-11 20:08:20 +02:00
Cargo.toml Replace in-tree rustc_apfloat with the new version of the crate 2023-07-26 10:20:15 -04:00
messages.ftl don't point at const usage site for resolution-time errors 2023-09-14 22:34:05 +02:00
README.md

README.md

For more information about how rustc works, see the rustc dev guide.