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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
commit | a4b7ed7a42c716ab9f05e351f003d589124fd55d (patch) | |
tree | b620cd3f223850b28716e474e80c58059dca5dd4 /tests/ui/impl-trait/negative-reasoning.rs | |
parent | Adding upstream version 1.67.1+dfsg1. (diff) | |
download | rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.tar.xz rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.zip |
Adding upstream version 1.68.2+dfsg1.upstream/1.68.2+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/impl-trait/negative-reasoning.rs')
-rw-r--r-- | tests/ui/impl-trait/negative-reasoning.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/negative-reasoning.rs b/tests/ui/impl-trait/negative-reasoning.rs new file mode 100644 index 000000000..70e24a3a9 --- /dev/null +++ b/tests/ui/impl-trait/negative-reasoning.rs @@ -0,0 +1,23 @@ +// Tests that we cannot assume that an opaque type does *not* implement some +// other trait +#![feature(type_alias_impl_trait)] + +trait OpaqueTrait {} +impl<T> OpaqueTrait for T {} +type OpaqueType = impl OpaqueTrait; +fn mk_opaque() -> OpaqueType { + () +} + +#[derive(Debug)] +struct D<T>(T); + +trait AnotherTrait {} +impl<T: std::fmt::Debug> AnotherTrait for T {} + +// This is in error, because we cannot assume that `OpaqueType: !Debug` +impl AnotherTrait for D<OpaqueType> { + //~^ ERROR conflicting implementations of trait `AnotherTrait` for type `D<OpaqueType>` +} + +fn main() {} |