Files
carbon-lang/toolchain/check/testdata/interface
josh11bandJosh L df958940c3 Builtin facet type conversion is final (#5220)
Don't look for a user-defined conversion (implementation of `As` or
`ImplicitAs`) if the builtin conversion to a facet type fails impl
lookup. This is the behavior we want, and reduces noise in diagnostics.

Partial implementation of #5122. Still to do:
* Give an error if the users tries to implement such a conversion, since
it is now unreachable.
* Add notes to the diagnostic explaining why impl lookup failed.

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Co-authored-by: Josh L <josh11b@users.noreply.github.com>
2025-03-31 16:11:07 +00:00
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