diff options
Diffstat (limited to 'tests/ui/traits/new-solver/dont-remap-tait-substs.rs')
-rw-r--r-- | tests/ui/traits/new-solver/dont-remap-tait-substs.rs | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/traits/new-solver/dont-remap-tait-substs.rs b/tests/ui/traits/new-solver/dont-remap-tait-substs.rs new file mode 100644 index 000000000..309bee8aa --- /dev/null +++ b/tests/ui/traits/new-solver/dont-remap-tait-substs.rs @@ -0,0 +1,19 @@ +// compile-flags: -Ztrait-solver=next +// check-pass + +// Makes sure we don't prepopulate the MIR typeck of `define` +// with `Foo<T, U> = T`, but instead, `Foo<B, A> = B`, so that +// the param-env predicates actually apply. + +#![feature(type_alias_impl_trait)] + +type Foo<T: Send, U> = impl NeedsSend<T>; + +trait NeedsSend<T> {} +impl<T: Send> NeedsSend<T> for T {} + +fn define<A, B: Send>(a: A, b: B, _: Foo<B, A>) { + let y: Option<Foo<B, A>> = Some(b); +} + +fn main() {} |