[beta] Backport fix for issue 29857 #30847
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…stead of `TyError` Conflicts: src/test/compile-fail/issue-29857.rs
the problem is that now "type_is_known_to_be_sized" now returns false when called on a type with ty_err inside - this prevents spurious errors (we may want to move the check to check::cast anyway - see rust-lang#12894).
Conflicts: src/test/compile-fail/issue-3973.rs
an error) but the bugfix causes this warning to propagate and become an unresolved variable instead of a `TyError`, so we wind up seeing an obscure inference error afterwards, which is somewhat unfortunate, and suggests this bugfix can cause RFC 1214 warnings to become errors.
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brson
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[beta] Backport fix for issue 29857
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Thanks @nikomatsakis |
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This is a backport of #30676. I dropped one commit (the one which removed
ErrorCandidatein favor of resolving to ambiguity) because it wasn't really necessary and I was afraid it may have unexpected complications.Note that one run-pass test stopped working after this backport. This problem did not arise on master because RFC1214 warnings were made into errors, and fixing the RFC1214 problem makes the test work. I ported the fix but this suggests that this backport could cause additional regressions.
r? @brson
cc @arielb1