src/test/ui/pattern/usefulness/issue-3601.stderr

   1 error[E0004]: non-exhaustive patterns: `Box(_, _)` not covered
   2   --> $DIR/issue-3601.rs:30:44
   3    |
   4 LL |         box NodeKind::Element(ed) => match ed.kind {
   5    |                                            ^^^^^^^ pattern `Box(_, _)` not covered
   6    |
   7    = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
   8    = note: the matched value is of type `Box<ElementKind>`
   9
  10 error: aborting due to previous error
  11
  12 For more information about this error, try `rustc --explain E0004`.