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b638266f23
Properly recover from parenthesized use-bounds (precise capturing lists) plus small cleanups Fixes https://github.com/rust-lang/rust/issues/145470. First commit fixes the issue, second one performs some desperately needed cleanups. The fix shouldn't be a breaking change because IINM the parser always ensures that all brackets are balanced (via a buffer of brackets). Meaning even though we used to accept `(use<>` as a valid precise capturing list, it was guaranteed that we would fail in the end.