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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/issues/issue-31299.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/issues/issue-31299.rs')
-rw-r--r-- | src/test/ui/issues/issue-31299.rs | 35 |
1 files changed, 0 insertions, 35 deletions
diff --git a/src/test/ui/issues/issue-31299.rs b/src/test/ui/issues/issue-31299.rs deleted file mode 100644 index 78c3252d3..000000000 --- a/src/test/ui/issues/issue-31299.rs +++ /dev/null @@ -1,35 +0,0 @@ -// run-pass -// Regression test for #31299. This was generating an overflow error -// because of eager normalization: -// -// proving `M: Sized` requires -// - proving `PtrBack<Vec<M>>: Sized` requires -// - normalizing `Vec<<Vec<M> as Front>::Back>>: Sized` requires -// - proving `Vec<M>: Front` requires -// - `M: Sized` <-- cycle! -// -// If we skip the normalization step, though, everything goes fine. -// -// This could be fixed by implementing lazy normalization everywhere. -// -// However, we want this to work before then. For that, when checking -// whether a type is Sized we only check that the tails are Sized. As -// PtrBack does not have a tail, we don't need to normalize anything -// and this compiles - -trait Front { - type Back; -} - -impl<T> Front for Vec<T> { - type Back = Vec<T>; -} - -struct PtrBack<T: Front>(#[allow(unused_tuple_struct_fields)] Vec<T::Back>); - -struct M(#[allow(unused_tuple_struct_fields)] PtrBack<Vec<M>>); - -#[allow(unused_must_use)] -fn main() { - std::mem::size_of::<M>(); -} |