bjoernager/rust
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Reveal empty opaques in depth

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This commit is contained in:
Nadrieril 2023-11-16 08:53:21 +01:00
parent c03d978a4b
commit 34307ab7c5
5 changed files with 133 additions and 41 deletions
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21
tests/ui/pattern/usefulness/impl-trait.rs
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@ -46,9 +46,7 @@ fn option_never(x: Void) -> Option<impl Copy> {
}
match option_never(x) {
None => {}
// FIXME: Unreachable not detected because `is_uninhabited` does not look into opaque
// types.
_ => {}
_ => {} //~ ERROR unreachable
}
}
Some(x)
@ -137,10 +135,21 @@ fn nested_empty_opaque(x: Void) -> X {
let opaque_void = nested_empty_opaque(x);
let secretely_void = SecretelyVoid(opaque_void);
match secretely_void {
// FIXME: Unreachable not detected because `is_uninhabited` does not look into opaque
// types.
_ => {}
_ => {} //~ ERROR unreachable
}
}
x
}
type Y = (impl Copy, impl Copy);
struct SecretelyDoubleVoid(Y);
fn super_nested_empty_opaque(x: Void) -> Y {
if false {
let opaque_void = super_nested_empty_opaque(x);
let secretely_void = SecretelyDoubleVoid(opaque_void);
match secretely_void {
_ => {} //~ ERROR unreachable
}
}
(x, x)
}