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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/regions/regions-variance-invariant-use-covariant.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/regions/regions-variance-invariant-use-covariant.rs')
-rw-r--r-- | tests/ui/regions/regions-variance-invariant-use-covariant.rs | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/regions/regions-variance-invariant-use-covariant.rs b/tests/ui/regions/regions-variance-invariant-use-covariant.rs new file mode 100644 index 000000000..ab6a82ee7 --- /dev/null +++ b/tests/ui/regions/regions-variance-invariant-use-covariant.rs @@ -0,0 +1,21 @@ +// Test that a type which is invariant with respect to its region +// parameter used in a covariant way yields an error. +// +// Note: see variance-regions-*.rs for the tests that check that the +// variance inference works in the first place. + +struct Invariant<'a> { + f: &'a mut &'a isize +} + +fn use_<'b>(c: Invariant<'b>) { + + // For this assignment to be legal, Invariant<'b> <: Invariant<'static>. + // Since 'b <= 'static, this would be true if Invariant were covariant + // with respect to its parameter 'a. + + let _: Invariant<'static> = c; + //~^ ERROR lifetime may not live long enough +} + +fn main() { } |