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Issue #4443 has been updated by matz (Yukihiro Matsumoto).
????????«ã?????JIS x3017??®ã????©ã????????è¦??????¨ç?¶ã?®è??価é??(å¤????代å?¥ã?®å?´å????«ã?¯å¾º??????)???è¨?è¿°ã????¦ã???????¾ã?????(11.4.2.4)???
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----------------------------------------
Bug #4443: odd evaluation order in a multiple assignment
https://bugs.ruby-lang.org/issues/4443#change-26244
Author: mame (Yusuke Endoh)
Status: Assigned
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category:
Target version:
ruby -v: -
=begin
?????¤ã?§ã?????core ??«æ???????¦ã????¾ã?£ã??????????ªã?®ã?§ç?»é?²ã????´ã?????
Ruby ??¯å·¦????????«è??価ã????²ã????¨ä¿¡?????¦ã???????®ã?§ã????????å¤????代å?¥ã?§è????????????¾ã????????
def foo
p :foo
[]
end
def bar
p :bar
end
x, foo[0] = bar, 0
bar ?????? foo ???å·¦ã?«ã???????®ã?§ã??:foo ???:bar ??®é????«å?ºå????????????????¨ã?????å¾?????????®ã?§ã??????????ªã????? :bar ???:foo ??«ã?ªã????¾ã?????
??·ä???????«ä???????°ã???????¨ã???????¨ã??ä¾???????
obj, obj.foo = obj.foo, obj
??«ã?? swap ??????å¾??????????????§ã????????????????ªã????¾ã??????????????????????³ã?¼ã????¯å???????«ã????¨ã?®å??転ã?ªã?©ã??å®?è£?????????¨ã????«ã????°ã????°æ?¸ã?????????ªã????¾ã??????????®æ???????«æ???????¤ã???????®ã?? splay tree ???å®?è£??????¦ã???????¨ã????§ã????????????????ªã??:
t.left, t.left.right, t = t.left.right, t, t.left
1.9 ç³»å????§ä¿®æ£ã????¹ã????¨ã?¾ã?§ã?¯æ???????¾ã???????????2.0 ??§ç?´ã????½æ?§ã?¯ã???????§ã??????????????
IRC ??§è©±????????????????????§æ?®é???????¿ã???????ªå??å¿????????????¾ã???????????
foo[0] = bar
??¯ã?¡ã???????? :foo ???:bar ??®é????«å?ºã?¾ã?????
--
Yusuke Endoh <mame / tsg.ne.jp>
=end
--
http://bugs.ruby-lang.org/