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6bf3cbe39e
In rustc it doesn't really matter what the order of the witnesses is, but I'm planning to use the witnesses for implementing the "add missing match arms" assist in rust-analyzer, and there `true` before `false` is the natural order (like `Some` before `None`), and also what the current assist does. The current order doesn't seem to be intentional; the code was created when bool ctors became their own thing, not just int ctors, but for integer, 0 before 1 is indeed the natural order.
29 lines
869 B
Rust
29 lines
869 B
Rust
//! Test non-exhaustive matches involving deref patterns.
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#![feature(deref_patterns)]
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#![expect(incomplete_features)]
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#![deny(unreachable_patterns)]
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fn main() {
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match Box::new(false) {
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//~^ ERROR non-exhaustive patterns: `deref!(true)` not covered
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false => {}
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}
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match Box::new(Box::new(false)) {
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//~^ ERROR non-exhaustive patterns: `deref!(deref!(false))` not covered
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true => {}
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}
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match Box::new((true, Box::new(false))) {
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//~^ ERROR non-exhaustive patterns: `deref!((true, deref!(true)))` and `deref!((false, deref!(false)))` not covered
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(true, false) => {}
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(false, true) => {}
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}
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enum T { A, B, C }
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match Box::new((Box::new(T::A), Box::new(T::A))) {
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//~^ ERROR non-exhaustive patterns: `deref!((deref!(T::C), _))` not covered
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(T::A | T::B, T::C) => {}
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}
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}
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