Make lifting infallible#155987
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Various places where `lift` just isn't necessary. Either because we're not within a closure passed to `tls::with`, or because the type being lifted doesn't have a `'tcx` lifetime.
Every lifting root calls `unwrap`/`expect` on the result, except for `ImmTy::fmt` but there's no good reason for that exception. Making lifting infallible is sensible because it should only fail if the wrong interner is somehow used, which indicates a major bug in rustc rather than an error condition.
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This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed. Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers. |
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