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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-trait-object-subtyping.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-trait-object-subtyping.rs')
-rw-r--r-- | src/test/ui/regions/regions-trait-object-subtyping.rs | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-trait-object-subtyping.rs b/src/test/ui/regions/regions-trait-object-subtyping.rs new file mode 100644 index 000000000..1d7a766de --- /dev/null +++ b/src/test/ui/regions/regions-trait-object-subtyping.rs @@ -0,0 +1,26 @@ +trait Dummy { fn dummy(&self); } + +fn foo1<'a:'b,'b>(x: &'a mut (dyn Dummy+'a)) -> &'b mut (dyn Dummy+'b) { + // Here, we are able to coerce + x +} + +fn foo2<'a:'b,'b>(x: &'b mut (dyn Dummy+'a)) -> &'b mut (dyn Dummy+'b) { + // Here, we are able to coerce + x +} + +fn foo3<'a,'b>(x: &'a mut dyn Dummy) -> &'b mut dyn Dummy { + // Without knowing 'a:'b, we can't coerce + x + //~^ ERROR lifetime may not live long enough +} + +struct Wrapper<T>(T); +fn foo4<'a:'b,'b>(x: Wrapper<&'a mut dyn Dummy>) -> Wrapper<&'b mut dyn Dummy> { + // We can't coerce because it is packed in `Wrapper` + x + //~^ ERROR lifetime may not live long enough +} + +fn main() {} |