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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 /tests/ui/variance/variance-contravariant-arg-object.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 'tests/ui/variance/variance-contravariant-arg-object.rs')
-rw-r--r-- | tests/ui/variance/variance-contravariant-arg-object.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/variance/variance-contravariant-arg-object.rs b/tests/ui/variance/variance-contravariant-arg-object.rs new file mode 100644 index 000000000..701fcaf69 --- /dev/null +++ b/tests/ui/variance/variance-contravariant-arg-object.rs @@ -0,0 +1,27 @@ +#![allow(dead_code)] + +// Test that even when `T` is only used in contravariant position, it +// is treated as invariant. + +trait Get<T> : 'static { + fn get(&self, t: T); +} + +fn get_min_from_max<'min, 'max>(v: Box<dyn Get<&'max i32>>) + -> Box<dyn Get<&'min i32>> + where 'max : 'min +{ + v + //~^ ERROR lifetime may not live long enough +} + +fn get_max_from_min<'min, 'max>(v: Box<dyn Get<&'min i32>>) + -> Box<dyn Get<&'max i32>> + where 'max : 'min +{ + // Previously OK: + v + //~^ ERROR lifetime may not live long enough +} + +fn main() { } |