1 files changed, 11 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-12552.rs b/src/test/ui/issues/issue-12552.rs
new file mode 100644
index 000000000..b7f71dd1c
--- /dev/null
+++ b/src/test/ui/issues/issue-12552.rs
@@ -0,0 +1,11 @@
+// this code used to cause an ICE
+
+fn main() {
+  let t = Err(0);
+  match t {
+    Some(k) => match k { //~ ERROR mismatched types
+      a => println!("{}", a)
+    },
+    None => () //~ ERROR mismatched types
+  }
+}