def p_default_option(self, p):
if p[<NUM_LIT:1>]:<EOL><INDENT>if isinstance(p[<NUM_LIT:2>], AstTagRef):<EOL><INDENT>p[<NUM_LIT:0>] = p[<NUM_LIT:2>]<EOL><DEDENT>else:<EOL><INDENT>p[<NUM_LIT:0>] = p[<NUM_LIT:2>]<EOL><DEDENT><DEDENT>
default_option : EQ primitive
                          | EQ tag_ref
                          | empty