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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.
35 lines
1.5 KiB
Plaintext
35 lines
1.5 KiB
Plaintext
error[E0004]: non-exhaustive patterns: `U8AsBool { n: 0_u8 }` and `U8AsBool { b: false }` not covered
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--> $DIR/unions.rs:22:15
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LL | match x {
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| ^ patterns `U8AsBool { n: 0_u8 }` and `U8AsBool { b: false }` not covered
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note: `U8AsBool` defined here
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--> $DIR/unions.rs:3:11
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LL | union U8AsBool {
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| ^^^^^^^^
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= note: the matched value is of type `U8AsBool`
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern, a match arm with multiple or-patterns as shown, or multiple match arms
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LL ~ U8AsBool { n: 1.. } => {},
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LL + U8AsBool { n: 0_u8 } | U8AsBool { b: false } => todo!()
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error[E0004]: non-exhaustive patterns: `(U8AsBool { n: 0_u8 }, false)`, `(U8AsBool { b: true }, false)`, `(U8AsBool { n: 0_u8 }, false)` and 1 more not covered
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--> $DIR/unions.rs:28:15
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LL | match (x, true) {
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| ^^^^^^^^^ patterns `(U8AsBool { n: 0_u8 }, false)`, `(U8AsBool { b: true }, false)`, `(U8AsBool { n: 0_u8 }, false)` and 1 more not covered
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= note: the matched value is of type `(U8AsBool, bool)`
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern as shown, or multiple match arms
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LL ~ (U8AsBool { n: 1.. }, true) => {},
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LL + _ => todo!()
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0004`.
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