code: def p_funcall_expr(p):
      
      if (len(p) == 5 and len(p[3]) == 1 and p[3][0].__class__ is node.expr and
              p[3][0].op == ":" and not p[3][0].args):
          # foo(:) => ravel(foo)
          p[0] = node.funcall(
              func_expr=node.ident("ravel"), args=node.expr_list([p[1]]))
      else:
          args = node.expr_list() if len(p) == 4 else p[3]
          assert isinstance(args, node.expr_list)
          p[0] = node.funcall(func_expr=p[1], args=args)
docs: expr : expr LPAREN expr_list RPAREN
              | expr LPAREN RPAREN