1 files changed, 18 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-4972.rs b/src/test/ui/issues/issue-4972.rs
new file mode 100644
index 000000000..fab258f13
--- /dev/null
+++ b/src/test/ui/issues/issue-4972.rs
@@ -0,0 +1,18 @@
+#![feature(box_patterns)]
+#![feature(box_syntax)]
+
+trait MyTrait {
+    fn dummy(&self) {}
+}
+
+pub enum TraitWrapper {
+    A(Box<dyn MyTrait + 'static>),
+}
+
+fn get_tw_map(tw: &TraitWrapper) -> &dyn MyTrait {
+    match *tw {
+        TraitWrapper::A(box ref map) => map, //~ ERROR cannot be dereferenced
+    }
+}
+
+pub fn main() {}