: VALUE rb_yield(VALUE val)
    yield  C ǤǤval ˥֥å¹Ԥޤ
    ʣΰͿȤ˳ǼϤޤ

    δؿƤӽФ᥽åɤ֥åȼʤϡ㳰
    LocalJumpError ȯޤ

