1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/ui/traits/impl-of-supertrait-has-wrong-lifetime-parameters.rs b/src/test/ui/traits/impl-of-supertrait-has-wrong-lifetime-parameters.rs
new file mode 100644
index 000000000..05b9db972
--- /dev/null
+++ b/src/test/ui/traits/impl-of-supertrait-has-wrong-lifetime-parameters.rs
@@ -0,0 +1,31 @@
+// Check that when we test the supertrait we ensure consistent use of
+// lifetime parameters. In this case, implementing T2<'a,'b> requires
+// an impl of T1<'a>, but we have an impl of T1<'b>.
+
+trait T1<'x> {
+    fn x(&self) -> &'x isize;
+}
+
+trait T2<'x, 'y> : T1<'x> {
+    fn y(&self) -> &'y isize;
+}
+
+struct S<'a, 'b> {
+    a: &'a isize,
+    b: &'b isize
+}
+
+impl<'a,'b> T1<'b> for S<'a, 'b> {
+    fn x(&self) -> &'b isize {
+        self.b
+    }
+}
+
+impl<'a,'b> T2<'a, 'b> for S<'a, 'b> { //~ ERROR cannot infer an appropriate lifetime
+    fn y(&self) -> &'b isize {
+        self.b
+    }
+}
+
+pub fn main() {
+}