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8ff355aefe
Make `lit_to_mir_constant` and `lit_to_const` infallible My motivation for this change is just that it's annoying to check everywhere, especially since all but one call site was just ICEing on errors anyway right there. They can still fail, but now just return an error constant instead of having the caller handle the error. fixes #114317 fixes #126182
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.