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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/specialization/specialization-default-types.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/specialization/specialization-default-types.rs')
-rw-r--r-- | tests/ui/specialization/specialization-default-types.rs | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/tests/ui/specialization/specialization-default-types.rs b/tests/ui/specialization/specialization-default-types.rs new file mode 100644 index 000000000..346471f11 --- /dev/null +++ b/tests/ui/specialization/specialization-default-types.rs @@ -0,0 +1,35 @@ +// It should not be possible to use the concrete value of a defaulted +// associated type in the impl defining it -- otherwise, what happens +// if it's overridden? + +#![feature(specialization)] //~ WARN the feature `specialization` is incomplete + +trait Example { + type Output; + fn generate(self) -> Self::Output; +} + +impl<T> Example for T { + default type Output = Box<T>; + default fn generate(self) -> Self::Output { + Box::new(self) //~ ERROR mismatched types + } +} + +impl Example for bool { + type Output = bool; + fn generate(self) -> bool { self } +} + +fn trouble<T>(t: T) -> Box<T> { + Example::generate(t) //~ ERROR mismatched types +} + +fn weaponize() -> bool { + let b: Box<bool> = trouble(true); + *b +} + +fn main() { + weaponize(); +} |