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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /src/test/ui/auto-traits/auto-trait-projection-recursion.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/auto-traits/auto-trait-projection-recursion.rs')
-rw-r--r-- | src/test/ui/auto-traits/auto-trait-projection-recursion.rs | 34 |
1 files changed, 0 insertions, 34 deletions
diff --git a/src/test/ui/auto-traits/auto-trait-projection-recursion.rs b/src/test/ui/auto-traits/auto-trait-projection-recursion.rs deleted file mode 100644 index a36f26f02..000000000 --- a/src/test/ui/auto-traits/auto-trait-projection-recursion.rs +++ /dev/null @@ -1,34 +0,0 @@ -// Checking the `Send` bound in `main` requires: -// -// checking <C<'static> as Y>::P: Send -// which normalizes to Box<X<C<'?1>>>: Send -// which needs X<C<'?1>>: Send -// which needs <C<'?1> as Y>::P: Send -// -// At this point we used to normalize the predicate to `Box<X<C<'?2>>>: Send` -// and continue in a loop where we created new region variables to the -// recursion limit. To avoid this we now "canonicalize" region variables to -// lowest unified region vid. This means we instead have to prove -// `Box<X<C<'?1>>>: Send`, which we can because auto traits are coinductive. - -// check-pass - -// Avoid a really long error message if this regresses. -#![recursion_limit="20"] - -trait Y { - type P; -} - -impl<'a> Y for C<'a> { - type P = Box<X<C<'a>>>; -} - -struct C<'a>(&'a ()); -struct X<T: Y>(T::P); - -fn is_send<S: Send>() {} - -fn main() { - is_send::<X<C<'static>>>(); -} |