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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/type-alias-impl-trait/reveal_local.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/type-alias-impl-trait/reveal_local.rs')
-rw-r--r-- | src/test/ui/type-alias-impl-trait/reveal_local.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/reveal_local.rs b/src/test/ui/type-alias-impl-trait/reveal_local.rs new file mode 100644 index 000000000..7ecb55353 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/reveal_local.rs @@ -0,0 +1,25 @@ +#![feature(type_alias_impl_trait)] + +use std::fmt::Debug; + +type Foo = impl Debug; +//~^ ERROR cycle detected + +fn is_send<T: Send>() { } + +fn not_good() { + // Error: this function does not constrain `Foo` to any particular + // hidden type, so it cannot rely on `Send` being true. + is_send::<Foo>(); +} + +fn not_gooder() { + // Constrain `Foo = u32` + let x: Foo = 22_u32; + + // while we could know this from the hidden type, it would + // need extra roundabout logic to support it. + is_send::<Foo>(); +} + +fn main() {} |