Propagate is_shorthand when folding syntex struct field
diff --git a/tests/test_round_trip.rs b/tests/test_round_trip.rs
index 14bfeb5..484ecb2 100644
--- a/tests/test_round_trip.rs
+++ b/tests/test_round_trip.rs
@@ -216,6 +216,7 @@
                                        self.fold_ident(field.ident.node)),
                 expr: self.fold_expr(field.expr),
                 span: self.new_span(field.span),
+                is_shorthand: field.is_shorthand,
             }
         }