1 files changed, 29 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/projection.rs b/src/test/ui/impl-trait/projection.rs
new file mode 100644
index 000000000..b33802e2b
--- /dev/null
+++ b/src/test/ui/impl-trait/projection.rs
@@ -0,0 +1,29 @@
+// build-pass
+// needs to be build-pass, because it is a regression test for a mir validation failure
+// that only happens during codegen.
+
+struct D;
+
+trait Tr {
+    type It;
+    fn foo(self) -> Option<Self::It>;
+}
+
+impl<'a> Tr for &'a D {
+    type It = ();
+    fn foo(self) -> Option<()> { None }
+}
+
+fn run<F>(f: F)
+    where for<'a> &'a D: Tr,
+          F: Fn(<&D as Tr>::It),
+{
+    let d = &D;
+    while let Some(i) = d.foo() {
+        f(i);
+    }
+}
+
+fn main() {
+    run(|_| {});
+}