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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.
64 lines
2.7 KiB
Plaintext
64 lines
2.7 KiB
Plaintext
error[E0004]: non-exhaustive patterns: `deref!(true)` not covered
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--> $DIR/non-exhaustive.rs:7:11
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LL | match Box::new(false) {
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| ^^^^^^^^^^^^^^^ pattern `deref!(true)` not covered
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note: `Box<bool>` defined here
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--> $SRC_DIR/alloc/src/boxed.rs:LL:COL
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= note: the matched value is of type `Box<bool>`
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
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LL ~ false => {},
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LL + deref!(true) => todo!()
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error[E0004]: non-exhaustive patterns: `deref!(deref!(false))` not covered
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--> $DIR/non-exhaustive.rs:12:11
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LL | match Box::new(Box::new(false)) {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ pattern `deref!(deref!(false))` not covered
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note: `Box<Box<bool>>` defined here
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--> $SRC_DIR/alloc/src/boxed.rs:LL:COL
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= note: the matched value is of type `Box<Box<bool>>`
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
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LL ~ true => {},
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LL + deref!(deref!(false)) => todo!()
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error[E0004]: non-exhaustive patterns: `deref!((true, deref!(true)))` and `deref!((false, deref!(false)))` not covered
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--> $DIR/non-exhaustive.rs:17:11
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LL | match Box::new((true, Box::new(false))) {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ patterns `deref!((true, deref!(true)))` and `deref!((false, deref!(false)))` not covered
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note: `Box<(bool, Box<bool>)>` defined here
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--> $SRC_DIR/alloc/src/boxed.rs:LL:COL
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= note: the matched value is of type `Box<(bool, Box<bool>)>`
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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 ~ (false, true) => {},
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LL + deref!((true, deref!(true))) | deref!((false, deref!(false))) => todo!()
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error[E0004]: non-exhaustive patterns: `deref!((deref!(T::C), _))` not covered
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--> $DIR/non-exhaustive.rs:24:11
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LL | match Box::new((Box::new(T::A), Box::new(T::A))) {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pattern `deref!((deref!(T::C), _))` not covered
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note: `Box<(Box<T>, Box<T>)>` defined here
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--> $SRC_DIR/alloc/src/boxed.rs:LL:COL
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= note: the matched value is of type `Box<(Box<T>, Box<T>)>`
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
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LL ~ (T::A | T::B, T::C) => {},
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LL + deref!((deref!(T::C), _)) => todo!()
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error: aborting due to 4 previous errors
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For more information about this error, try `rustc --explain E0004`.
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