1 files changed, 34 insertions, 0 deletions
diff --git a/src/test/ui/pattern/usefulness/issue-3601.rs b/src/test/ui/pattern/usefulness/issue-3601.rs
new file mode 100644
index 000000000..6215a2398
--- /dev/null
+++ b/src/test/ui/pattern/usefulness/issue-3601.rs
@@ -0,0 +1,34 @@
+#![feature(box_patterns)]
+
+struct HTMLImageData {
+    image: Option<String>
+}
+
+struct ElementData {
+    kind: Box<ElementKind>
+}
+
+enum ElementKind {
+    HTMLImageElement(HTMLImageData)
+}
+
+enum NodeKind {
+    Element(ElementData)
+}
+
+struct NodeData {
+    kind: Box<NodeKind>,
+}
+
+fn main() {
+    let mut id = HTMLImageData { image: None };
+    let ed = ElementData { kind: Box::new(ElementKind::HTMLImageElement(id)) };
+    let n = NodeData { kind: Box::new(NodeKind::Element(ed)) };
+
+    // n.b. span could be better
+    match n.kind {
+        box NodeKind::Element(ed) => match ed.kind { //~ ERROR non-exhaustive patterns
+            box ElementKind::HTMLImageElement(ref d) if d.image.is_some() => { true }
+        },
+    };
+}