1 files changed, 36 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/normalization-generality.rs b/src/test/ui/associated-types/normalization-generality.rs
new file mode 100644
index 000000000..f8e3f5b58
--- /dev/null
+++ b/src/test/ui/associated-types/normalization-generality.rs
@@ -0,0 +1,36 @@
+// build-pass
+
+// Ensures that we don't regress on "implementation is not general enough" when
+// normalizating under binders.
+
+#![feature(no_core)]
+
+pub trait Yokeable<'a> {
+    type Output: 'a;
+}
+
+pub struct Yoke<Y: for<'a> Yokeable<'a>> {
+    _yokeable: Y,
+}
+
+impl<Y: for<'a> Yokeable<'a>> Yoke<Y> {
+    pub fn project<'this, P>(
+        &'this self,
+        _f: for<'a> fn(<Y as Yokeable<'a>>::Output, &'a ()) -> <P as Yokeable<'a>>::Output,
+    ) -> Yoke<P>
+    where
+        P: for<'a> Yokeable<'a>,
+    {
+        unimplemented!()
+    }
+}
+
+pub fn slice(y: Yoke<&'static ()>) -> Yoke<&'static ()> {
+    y.project(move |yk, _| yk)
+}
+
+impl<'a, T> Yokeable<'a> for &'static T {
+    type Output = &'a T;
+}
+
+fn main() {}