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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-fn-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-fn-subtyping.rs')
-rw-r--r-- | src/test/ui/regions/regions-fn-subtyping.rs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-fn-subtyping.rs b/src/test/ui/regions/regions-fn-subtyping.rs new file mode 100644 index 000000000..9570359c6 --- /dev/null +++ b/src/test/ui/regions/regions-fn-subtyping.rs @@ -0,0 +1,30 @@ +// run-pass +#![allow(dead_code)] +#![allow(unused_assignments)] +// Issue #2263. + +// pretty-expanded FIXME #23616 + +#![allow(unused_variables)] + +// Should pass region checking. +fn ok(f: Box<dyn FnMut(&usize)>) { + // Here, g is a function that can accept a usize pointer with + // lifetime r, and f is a function that can accept a usize pointer + // with any lifetime. The assignment g = f should be OK (i.e., + // f's type should be a subtype of g's type), because f can be + // used in any context that expects g's type. But this currently + // fails. + let mut g: Box<dyn for<'r> FnMut(&'r usize)> = Box::new(|x| { }); + g = f; +} + +// This version is the same as above, except that here, g's type is +// inferred. +fn ok_inferred(f: Box<dyn FnMut(&usize)>) { + let mut g: Box<dyn for<'r> FnMut(&'r usize)> = Box::new(|_| {}); + g = f; +} + +pub fn main() { +} |