Delay a bug when encountering an impl with unconstrained generics in codegen_select
#133368
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r? @wesleywiser rustbot has assigned @wesleywiser. Use |
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Nov 23, 2024
| // for this and will in fact ICE in stable hashing of the return value. So bail out instead. | ||
| infcx.tcx.dcx().has_errors().unwrap(); | ||
| let impl_source = tcx.erase_regions(impl_source); | ||
| if impl_source.has_non_region_infer() { |
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this is a drive by to make it clear what it's looking for. no functional change.
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Despite its name,
codegen_selectis what powersInstance::try_resolve, which is used in pre-codegen contexts to try to resolve a method where possible. One place that it's used is in the "recursion MIR lint" that detects recursive MIR bodies.If we encounter an impl in
codegen_selectthat contains unconstrained generic parameters, we expect that impl to caused an error to be reported; however, there's no temporal guarantee that this error is reported before we callcodegen_select. This is what a delayed bug is for, and this PR makes us use a delayed bug rather than asserting something about errors already having been emitted.Fixes #126646