许杰友 Jieyou Xu (Joe)
f9f667f8b9
Reject negative literals for unsigned or char types in pattern ranges and literals It sucks a bit that we have to duplicate the work here (normal expressions just get this for free from the `ExprKind::UnOp(UnOp::Neg, ...)` typeck logic. In https://github.com/rust-lang/rust/pull/134228 I caused ```rust fn main() { match 42_u8 { -10..255 => {}, _ => {} } } ``` to just compile without even a lint. I can't believe we didn't have tests for this Amusingly https://github.com/rust-lang/rust/pull/136302 will also register a delayed bug in `lit_to_const` for this, so we'll have a redundancy if something like this fails again.
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