1 files changed, 111 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/associated-types-eq-hr.rs b/src/test/ui/associated-types/associated-types-eq-hr.rs
new file mode 100644
index 000000000..dc653f7f2
--- /dev/null
+++ b/src/test/ui/associated-types/associated-types-eq-hr.rs
@@ -0,0 +1,111 @@
+// Check testing of equality constraints in a higher-ranked context.
+
+pub trait TheTrait<T> {
+    type A;
+
+    fn get(&self, t: T) -> Self::A;
+}
+
+struct IntStruct {
+    x: isize,
+}
+
+impl<'a> TheTrait<&'a isize> for IntStruct {
+    type A = &'a isize;
+
+    fn get(&self, t: &'a isize) -> &'a isize {
+        t
+    }
+}
+
+struct UintStruct {
+    x: isize,
+}
+
+impl<'a> TheTrait<&'a isize> for UintStruct {
+    type A = &'a usize;
+
+    fn get(&self, t: &'a isize) -> &'a usize {
+        panic!()
+    }
+}
+
+struct Tuple {}
+
+impl<'a> TheTrait<(&'a isize, &'a isize)> for Tuple {
+    type A = &'a isize;
+
+    fn get(&self, t: (&'a isize, &'a isize)) -> &'a isize {
+        t.0
+    }
+}
+
+fn foo<T>()
+where
+    T: for<'x> TheTrait<&'x isize, A = &'x isize>,
+{
+    // ok for IntStruct, but not UintStruct
+}
+
+fn bar<T>()
+where
+    T: for<'x> TheTrait<&'x isize, A = &'x usize>,
+{
+    // ok for UintStruct, but not IntStruct
+}
+
+fn tuple_one<T>()
+where
+    T: for<'x, 'y> TheTrait<(&'x isize, &'y isize), A = &'x isize>,
+{
+    // not ok for tuple, two lifetimes and we pick first
+}
+
+fn tuple_two<T>()
+where
+    T: for<'x, 'y> TheTrait<(&'x isize, &'y isize), A = &'y isize>,
+{
+    // not ok for tuple, two lifetimes and we pick second
+}
+
+fn tuple_three<T>()
+where
+    T: for<'x> TheTrait<(&'x isize, &'x isize), A = &'x isize>,
+{
+    // ok for tuple
+}
+
+fn tuple_four<T>()
+where
+    T: for<'x, 'y> TheTrait<(&'x isize, &'y isize)>,
+{
+    // not ok for tuple, two lifetimes, and lifetime matching is invariant
+}
+
+pub fn call_foo() {
+    foo::<IntStruct>();
+    foo::<UintStruct>(); //~ ERROR type mismatch
+}
+
+pub fn call_bar() {
+    bar::<IntStruct>(); //~ ERROR type mismatch
+    bar::<UintStruct>();
+}
+
+pub fn call_tuple_one() {
+    tuple_one::<Tuple>();
+}
+
+pub fn call_tuple_two() {
+    tuple_two::<Tuple>();
+}
+
+pub fn call_tuple_three() {
+    tuple_three::<Tuple>();
+}
+
+pub fn call_tuple_four() {
+    tuple_four::<Tuple>();
+}
+
+fn main() {}