1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/ui/coercion/retslot-cast.rs b/src/test/ui/coercion/retslot-cast.rs
new file mode 100644
index 000000000..ae500cb15
--- /dev/null
+++ b/src/test/ui/coercion/retslot-cast.rs
@@ -0,0 +1,22 @@
+#![allow(warnings)]
+
+pub fn fail(x: Option<&(Iterator<Item=()>+Send)>)
+            -> Option<&Iterator<Item=()>> {
+    // This call used to trigger an LLVM assertion because the return
+    // slot had type "Option<&Iterator>"* instead of
+    // "Option<&(Iterator+Send)>"* -- but this now yields a
+    // compilation error and I'm not sure how to create a comparable
+    // test. To ensure that this PARTICULAR failure doesn't occur
+    // again, though, I've left this test here, so if this ever starts
+    // to compile again, we can adjust the test appropriately (clearly
+    // it should never ICE...). -nmatsakis
+    inner(x) //~ ERROR mismatched types
+}
+
+pub fn inner(x: Option<&(Iterator<Item=()>+Send)>)
+             -> Option<&(Iterator<Item=()>+Send)> {
+    x
+}
+
+
+fn main() {}