diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:03 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:03 +0000 |
commit | 64d98f8ee037282c35007b64c2649055c56af1db (patch) | |
tree | 5492bcf97fce41ee1c0b1cc2add283f3e66cdab0 /tests/ui/dropck/issue-28498-ugeh-with-lifetime-param.rs | |
parent | Adding debian version 1.67.1+dfsg1-1. (diff) | |
download | rustc-64d98f8ee037282c35007b64c2649055c56af1db.tar.xz rustc-64d98f8ee037282c35007b64c2649055c56af1db.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/dropck/issue-28498-ugeh-with-lifetime-param.rs')
-rw-r--r-- | tests/ui/dropck/issue-28498-ugeh-with-lifetime-param.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/ui/dropck/issue-28498-ugeh-with-lifetime-param.rs b/tests/ui/dropck/issue-28498-ugeh-with-lifetime-param.rs new file mode 100644 index 000000000..43c0bfb26 --- /dev/null +++ b/tests/ui/dropck/issue-28498-ugeh-with-lifetime-param.rs @@ -0,0 +1,38 @@ +// run-pass + +// Demonstrate the use of the unguarded escape hatch with a lifetime param +// to assert that destructor will not access any dead data. +// +// Compare with ui/span/issue28498-reject-lifetime-param.rs + +#![feature(dropck_eyepatch)] + +#[derive(Debug)] +struct ScribbleOnDrop(String); + +impl Drop for ScribbleOnDrop { + fn drop(&mut self) { + self.0 = format!("DROPPED"); + } +} + +struct Foo<'a>(u32, &'a ScribbleOnDrop); + +unsafe impl<#[may_dangle] 'a> Drop for Foo<'a> { + fn drop(&mut self) { + // Use of `may_dangle` is sound, because destructor never accesses `self.1`. + println!("Dropping Foo({}, _)", self.0); + } +} + +fn main() { + let (last_dropped, foo0); + let (foo1, first_dropped); + + last_dropped = ScribbleOnDrop(format!("last")); + first_dropped = ScribbleOnDrop(format!("first")); + foo0 = Foo(0, &last_dropped); + foo1 = Foo(1, &first_dropped); + + println!("foo0.1: {:?} foo1.1: {:?}", foo0.1, foo1.1); +} |