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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/box/thin_drop.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/box/thin_drop.rs')
-rw-r--r-- | src/test/ui/box/thin_drop.rs | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/test/ui/box/thin_drop.rs b/src/test/ui/box/thin_drop.rs new file mode 100644 index 000000000..965613c11 --- /dev/null +++ b/src/test/ui/box/thin_drop.rs @@ -0,0 +1,37 @@ +#![feature(thin_box)] +// run-pass +use std::boxed::ThinBox; +use std::error::Error; +use std::ops::Deref; +use std::fmt; + +fn main() { + let expected = "Foo error!"; + let mut dropped = false; + { + let foo = Foo(expected, &mut dropped); + let a: ThinBox<dyn Error> = ThinBox::new_unsize(foo); + let a = a.deref(); + let msg = a.to_string(); + assert_eq!(expected, msg); + } + assert!(dropped); +} + +#[derive(Debug)] +#[repr(align(1024))] +struct Foo<'a>(&'static str, &'a mut bool); + +impl Drop for Foo<'_> { + fn drop(&mut self) { + *self.1 = true; + } +} + +impl fmt::Display for Foo<'_> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "{}", self.0) + } +} + +impl Error for Foo<'_> {} |