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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/impl-trait/can-return-unconstrained-closure.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/impl-trait/can-return-unconstrained-closure.rs')
-rw-r--r-- | src/test/ui/impl-trait/can-return-unconstrained-closure.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/can-return-unconstrained-closure.rs b/src/test/ui/impl-trait/can-return-unconstrained-closure.rs new file mode 100644 index 000000000..7ae1ac4f5 --- /dev/null +++ b/src/test/ui/impl-trait/can-return-unconstrained-closure.rs @@ -0,0 +1,23 @@ +// Test that we are special casing "outlives" for opaque types. +// +// The return type of a closure is not required to outlive the closure. As such +// the following code would not compile if we used a standard outlives check +// when checking the return type, because the return type of the closure would +// be `&ReEmpty i32`, and we don't allow `ReEmpty` to occur in the concrete +// type used for an opaque type. +// +// However, opaque types are special cased to include check all regions in the +// concrete type against the bound, which forces the return type to be +// `&'static i32` here. + +// build-pass (FIXME(62277): could be check-pass?) + +fn make_identity() -> impl Sized { + |x: &'static i32| x +} + +fn make_identity_static() -> impl Sized + 'static { + |x: &'static i32| x +} + +fn main() {} |