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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_zst.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_zst.rs')
-rw-r--r-- | src/test/ui/box/thin_zst.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/test/ui/box/thin_zst.rs b/src/test/ui/box/thin_zst.rs new file mode 100644 index 000000000..77c400d17 --- /dev/null +++ b/src/test/ui/box/thin_zst.rs @@ -0,0 +1,34 @@ +#![feature(thin_box)] +// run-pass +use std::boxed::ThinBox; +use std::error::Error; +use std::{fmt, mem}; +use std::ops::DerefMut; + +const EXPECTED: &str = "boooo!"; + +fn main() { + let thin_error: ThinBox<dyn Error> = ThinBox::new_unsize(Foo); + assert_eq!(mem::size_of::<*const i32>(), mem::size_of_val(&thin_error)); + let msg = thin_error.to_string(); + assert_eq!(EXPECTED, msg); + + let mut thin_concrete_error: ThinBox<Foo> = ThinBox::new(Foo); + assert_eq!(mem::size_of::<*const i32>(), mem::size_of_val(&thin_concrete_error)); + let msg = thin_concrete_error.to_string(); + assert_eq!(EXPECTED, msg); + let inner = thin_concrete_error.deref_mut(); + let msg = inner.to_string(); + assert_eq!(EXPECTED, msg); +} + +#[derive(Debug)] +struct Foo; + +impl fmt::Display for Foo { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "{}", EXPECTED) + } +} + +impl Error for Foo {} |