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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/traits/conditional-dispatch.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 '')
-rw-r--r-- | src/test/ui/traits/conditional-dispatch.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/test/ui/traits/conditional-dispatch.rs b/src/test/ui/traits/conditional-dispatch.rs new file mode 100644 index 000000000..dd882dce6 --- /dev/null +++ b/src/test/ui/traits/conditional-dispatch.rs @@ -0,0 +1,34 @@ +// run-pass +// Test that we are able to resolve conditional dispatch. Here, the +// blanket impl for T:Copy coexists with an impl for Box<T>, because +// Box does not impl Copy. + + +trait Get { + fn get(&self) -> Self; +} + +trait MyCopy { fn copy(&self) -> Self; } +impl MyCopy for u16 { fn copy(&self) -> Self { *self } } +impl MyCopy for u32 { fn copy(&self) -> Self { *self } } +impl MyCopy for i32 { fn copy(&self) -> Self { *self } } +impl<T:Copy> MyCopy for Option<T> { fn copy(&self) -> Self { *self } } + +impl<T:MyCopy> Get for T { + fn get(&self) -> T { self.copy() } +} + +impl Get for Box<i32> { + fn get(&self) -> Box<i32> { Box::new(get_it(&**self)) } +} + +fn get_it<T:Get>(t: &T) -> T { + (*t).get() +} + +fn main() { + assert_eq!(get_it(&1_u32), 1_u32); + assert_eq!(get_it(&1_u16), 1_u16); + assert_eq!(get_it(&Some(1_u16)), Some(1_u16)); + assert_eq!(get_it(&Box::new(1)), Box::new(1)); +} |