error: main macro message
 --> $DIR/children_messages.rs:4:20
  |
4 | children_messages!(one, two, three, four);
  |                    ^^^

error: child message
 --> $DIR/children_messages.rs:4:25
  |
4 | children_messages!(one, two, three, four);
  |                         ^^^

error: main syn::Error
 --> $DIR/children_messages.rs:4:30
  |
4 | children_messages!(one, two, three, four);
  |                              ^^^^^

error: child syn::Error
 --> $DIR/children_messages.rs:4:37
  |
4 | children_messages!(one, two, three, four);
  |                                     ^^^^