CONCAT
tree1 = body ? create_tree (dfa, body, cls, CONCAT) : cls;
tree = create_tree (dfa, op, tree1, CONCAT);
if (node->token.type == CONCAT)
case CONCAT:
case CONCAT:
root = create_tree (dfa, tree, eor, CONCAT);
bin_tree_t *newtree = create_tree (dfa, tree, expr, CONCAT);
tree = create_tree (dfa, tree, mbc_remain, CONCAT);
tree = create_tree (dfa, tree, elem, CONCAT);
tree = create_tree (dfa, tree, elem, CONCAT);
tree = create_tree (dfa, old_tree, tree, CONCAT);