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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/regions/regions-variance-contravariant-use-contravariant.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/regions/regions-variance-contravariant-use-contravariant.rs')
-rw-r--r-- | src/test/ui/regions/regions-variance-contravariant-use-contravariant.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-variance-contravariant-use-contravariant.rs b/src/test/ui/regions/regions-variance-contravariant-use-contravariant.rs new file mode 100644 index 000000000..e63778670 --- /dev/null +++ b/src/test/ui/regions/regions-variance-contravariant-use-contravariant.rs @@ -0,0 +1,27 @@ +// run-pass +#![allow(dead_code)] +#![allow(unused_variables)] +// Test that a type which is contravariant with respect to its region +// parameter compiles successfully when used in a contravariant way. +// +// Note: see ui/variance/variance-regions-*.rs for the tests that check that the +// variance inference works in the first place. + +// pretty-expanded FIXME #23616 + +struct Contravariant<'a> { + f: &'a isize +} + +fn use_<'a>(c: Contravariant<'a>) { + let x = 3; + + // 'b winds up being inferred to this call. + // Contravariant<'a> <: Contravariant<'call> is true + // if 'call <= 'a, which is true, so no error. + collapse(&x, c); + + fn collapse<'b>(x: &'b isize, c: Contravariant<'b>) { } +} + +pub fn main() {} |