1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/borrowck/issue-51348-multi-ref-mut-in-guard.rs b/tests/ui/borrowck/issue-51348-multi-ref-mut-in-guard.rs
new file mode 100644
index 000000000..7d5acb957
--- /dev/null
+++ b/tests/ui/borrowck/issue-51348-multi-ref-mut-in-guard.rs
@@ -0,0 +1,21 @@
+// We used to ICE if you had a single match arm with multiple
+// candidate patterns with `ref mut` identifiers used in the arm's
+// guard.
+//
+// Also, this test expands on the original bug's example by actually
+// trying to double check that we are matching against the right part
+// of the input data based on which candidate pattern actually fired.
+
+// run-pass
+
+fn foo(x: &mut Result<(u32, u32), (u32, u32)>) -> u32 {
+    match *x {
+        Ok((ref mut v, _)) | Err((_, ref mut v)) if *v > 0 => { *v }
+        _ => { 0 }
+    }
+}
+
+fn main() {
+    assert_eq!(foo(&mut Ok((3, 4))), 3);
+    assert_eq!(foo(&mut Err((3, 4))), 4);
+}