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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 /tests/ui/issues/issue-28498-ugeh-ex1.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 'tests/ui/issues/issue-28498-ugeh-ex1.rs')
-rw-r--r-- | tests/ui/issues/issue-28498-ugeh-ex1.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/issues/issue-28498-ugeh-ex1.rs b/tests/ui/issues/issue-28498-ugeh-ex1.rs new file mode 100644 index 000000000..24bf706ce --- /dev/null +++ b/tests/ui/issues/issue-28498-ugeh-ex1.rs @@ -0,0 +1,27 @@ +// run-pass + +// Example taken from RFC 1238 text + +// https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md +// #example-of-the-unguarded-escape-hatch + +#![feature(dropck_eyepatch)] +use std::cell::Cell; + +struct Concrete<'a>(#[allow(unused_tuple_struct_fields)] u32, Cell<Option<&'a Concrete<'a>>>); + +struct Foo<T> { data: Vec<T> } + +// Below is the UGEH attribute +unsafe impl<#[may_dangle] T> Drop for Foo<T> { + fn drop(&mut self) { } +} + +fn main() { + let mut foo = Foo { data: Vec::new() }; + foo.data.push(Concrete(0, Cell::new(None))); + foo.data.push(Concrete(0, Cell::new(None))); + + foo.data[0].1.set(Some(&foo.data[1])); + foo.data[1].1.set(Some(&foo.data[0])); +} |