1 files changed, 22 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-26262.rs b/tests/ui/issues/issue-26262.rs
new file mode 100644
index 000000000..41135db91
--- /dev/null
+++ b/tests/ui/issues/issue-26262.rs
@@ -0,0 +1,22 @@
+// Check that projections don't count as constraining type parameters.
+
+struct S<T>(T);
+
+trait Tr { type Assoc; fn test(); }
+
+impl<T: Tr> S<T::Assoc> {
+//~^ ERROR the type parameter `T` is not constrained
+    fn foo(self, _: T) {
+        T::test();
+    }
+}
+
+trait Trait1<T> { type Bar; }
+trait Trait2<'x> { type Foo; }
+
+impl<'a,T: Trait2<'a>> Trait1<<T as Trait2<'a>>::Foo> for T {
+//~^ ERROR the lifetime parameter `'a` is not constrained
+    type Bar = &'a ();
+}
+
+fn main() {}