1 files changed, 18 insertions, 0 deletions
diff --git a/tests/ui/pattern/usefulness/issue-3601.stderr b/tests/ui/pattern/usefulness/issue-3601.stderr
new file mode 100644
index 000000000..59d7bcd4b
--- /dev/null
+++ b/tests/ui/pattern/usefulness/issue-3601.stderr
@@ -0,0 +1,18 @@
+error[E0004]: non-exhaustive patterns: `box _` not covered
+  --> $DIR/issue-3601.rs:30:44
+   |
+LL |         box NodeKind::Element(ed) => match ed.kind {
+   |                                            ^^^^^^^ pattern `box _` not covered
+   |
+note: `Box<ElementKind>` defined here
+  --> $SRC_DIR/alloc/src/boxed.rs:LL:COL
+   = note: the matched value is of type `Box<ElementKind>`
+help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
+   |
+LL ~             box ElementKind::HTMLImageElement(ref d) if d.image.is_some() => { true }
+LL +             box _ => todo!()
+   |
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0004`.