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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /src/test/ui/nll/relate_tys/var-appears-twice.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/nll/relate_tys/var-appears-twice.rs')
-rw-r--r-- | src/test/ui/nll/relate_tys/var-appears-twice.rs | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/src/test/ui/nll/relate_tys/var-appears-twice.rs b/src/test/ui/nll/relate_tys/var-appears-twice.rs deleted file mode 100644 index 77129f446..000000000 --- a/src/test/ui/nll/relate_tys/var-appears-twice.rs +++ /dev/null @@ -1,25 +0,0 @@ -// Test that the NLL `relate_tys` code correctly deduces that a -// function returning always its first argument can be upcast to one -// that returns either first or second argument. - -use std::cell::Cell; - -type DoubleCell<A> = Cell<(A, A)>; -type DoublePair<A> = (A, A); - -fn make_cell<'b>(x: &'b u32) -> Cell<(&'static u32, &'b u32)> { - panic!() -} - -fn main() { - let a: &'static u32 = &22; - let b = 44; - - // Here we get an error because `DoubleCell<_>` requires the same type - // on both parts of the `Cell`, and we can't have that. - let x: DoubleCell<_> = make_cell(&b); //~ ERROR - - // Here we do not get an error because `DoublePair<_>` permits - // variance on the lifetimes involved. - let y: DoublePair<_> = make_cell(&b).get(); -} |