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7fc6365570
Match usize/isize exhaustively with half-open ranges The long-awaited finale to the saga of [exhaustiveness checking for integers](https://github.com/rust-lang/rust/pull/50912)! ```rust match 0usize { 0.. => {} // exhaustive! } match 0usize { 0..usize::MAX => {} // helpful error message! } ``` Features: - Half-open ranges behave as expected for `usize`/`isize`; - Trying to use `0..usize::MAX` will tell you that `usize::MAX..` is missing and explain why. No more unhelpful "`_` is missing"; - Everything else stays the same. This should unblock https://github.com/rust-lang/rust/issues/37854. Review-wise: - I recommend looking commit-by-commit; - This regresses perf because of the added complexity in `IntRange`; hopefully not too much; - I measured each `#[inline]`, they all help a bit with the perf regression (tho I don't get why); - I did not touch MIR building; I expect there's an easy PR there that would skip unnecessary comparisons when the range is half-open. |
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