tests/ui/parser/box-can-begin-expr.stderr

error: expected expression, found reserved keyword `box`
  --> $DIR/box-can-begin-expr.rs:16:5
   |
LL |     ($e:expr) => {};
   |      ------- while parsing argument for this `expr` macro fragment
...
LL | mk!(box 0);
   |     ^^^ expected expression

error: aborting due to 1 previous error