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author | Albert Larsan <74931857+albertlarsan68@users.noreply.github.com> | 2023-01-05 09:13:28 +0100 |
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committer | Albert Larsan <74931857+albertlarsan68@users.noreply.github.com> | 2023-01-11 09:32:08 +0000 |
commit | cf2dff2b1e3fa55fa5415d524200070d0d7aacfe (patch) | |
tree | 40a88d9a46aaf3e8870676eb2538378b75a263eb /tests/ui/impl-trait/negative-reasoning.rs | |
parent | ca855e6e42787ecd062d81d53336fe6788ef51a9 (diff) |
Move /src/test to /tests
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 00000000000..70e24a3a9d0 --- /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() {} |