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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/variance/variance-unused-type-param.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/variance/variance-unused-type-param.rs')
-rw-r--r-- | src/test/ui/variance/variance-unused-type-param.rs | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/variance/variance-unused-type-param.rs b/src/test/ui/variance/variance-unused-type-param.rs new file mode 100644 index 000000000..d11140643 --- /dev/null +++ b/src/test/ui/variance/variance-unused-type-param.rs @@ -0,0 +1,28 @@ +#![allow(dead_code)] + +// Test that we report an error for unused type parameters in types and traits, +// and that we offer a helpful suggestion. + +struct SomeStruct<A> { x: u32 } +//~^ ERROR parameter `A` is never used + +enum SomeEnum<A> { Nothing } +//~^ ERROR parameter `A` is never used + +// Here T might *appear* used, but in fact it isn't. +enum ListCell<T> { +//~^ ERROR parameter `T` is never used + Cons(Box<ListCell<T>>), + Nil +} + +struct WithBounds<T: Sized> {} +//~^ ERROR parameter `T` is never used + +struct WithWhereBounds<T> where T: Sized {} +//~^ ERROR parameter `T` is never used + +struct WithOutlivesBounds<T: 'static> {} +//~^ ERROR parameter `T` is never used + +fn main() {} |