From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:13 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- tests/ui/issues/issue-28498-ugeh-ex1.rs | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 tests/ui/issues/issue-28498-ugeh-ex1.rs (limited to 'tests/ui/issues/issue-28498-ugeh-ex1.rs') 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>>); + +struct Foo { data: Vec } + +// Below is the UGEH attribute +unsafe impl<#[may_dangle] T> Drop for Foo { + 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])); +} -- cgit v1.2.3