1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/type-alias-impl-trait/coherence.rs b/tests/ui/type-alias-impl-trait/coherence.rs
new file mode 100644
index 000000000..077a31494
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/coherence.rs
@@ -0,0 +1,17 @@
+// aux-build:foreign-crate.rs
+#![feature(type_alias_impl_trait)]
+
+extern crate foreign_crate;
+
+trait LocalTrait {}
+impl<T> LocalTrait for foreign_crate::ForeignType<T> {}
+
+type AliasOfForeignType<T> = impl LocalTrait;
+fn use_alias<T>(val: T) -> AliasOfForeignType<T> {
+    foreign_crate::ForeignType(val)
+}
+
+impl<T> foreign_crate::ForeignTrait for AliasOfForeignType<T> {}
+//~^ ERROR only traits defined in the current crate can be implemented for arbitrary types
+
+fn main() {}