93f1443280
Replace regions in const canonical vars' types with `'static` in next-solver canonicalizer We shouldn't ever have non-static regions in consts on stable (or really any regions at all, lol). The test I committed is less minimal than, e.g., https://github.com/rust-lang/rust/issues/123155?notification_referrer_id=NT_kwDOADgQyrMxMDAzNDU4MDI0OTozNjc0MzE0#issuecomment-2025472029 -- however, I believe that it actually portrays the underlying issue here a bit better than that one. In the linked issue, we end up emitting a normalizes-to predicate for a const placeholder because we don't actually unify `false` and `""`. In the test I committed, we emit a normalizes-to predicate as a part of actually solving a negative coherence goal. Fixes #123155 Fixes #118783 r? lcnr
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