[feature:1.9] ENV#[]= and nil

Ruby Development
1

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1.8 e$B$G$Oe(B ENV[“FOO”] = nil e$B$O4D6-JQ?t$r>C$7$^$9$,!"e(B1.9
e$B$G$O%(%i!<$K$J$j!"e(B
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env_foo = ENV["FOO"]
ENV["FOO"] = "something"
system(...)
ENV["FOO"] = env_foo

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env_foo = ENV["FOO"]
ENV["FOO"] = "something"
system(...)
if env_foo
  ENV["FOO"] = env_foo
else
  ENV.delete("FOO")
end

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  1. 1.8 e$B$N5sF0$KLa$9e(B (ENV e$B$@$1e(B nil e$B$rFCJL07$$$9$ke(B)
  2. 1.8 e$B$Ne(B ENV#[]= e$B$HF1$85sF0$r$9$k%a%=%C%I$rDs6!$9$ke(B
    (ENV#assign e$B$H$+e(B)

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2

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In message “Re: [ruby-dev:36465] [feature:1.9] ENV#[]= and nil”
on Mon, 22 Sep 2008 20:42:38 +0900, “Yusuke ENDOH” [email protected]
writes:
|1.8 e$B$G$Oe(B ENV[“FOO”] = nil e$B$O4D6-JQ?t$r>C$7$^$9$,!"e(B1.9 e$B$G$O%(%i!<$K$J$j!"e(B
|e$BITJX$G$9!#;R%W%m%;%9$r:n$k$H$-$J$I$G!"0l;~E*$K4D6-JQ?t$rJQ$($k$?$a$Ke(B

<e$BCfN,e(B>

|e$B$H$H$F$b>iD9$K$J$j$^$9!#$$$m$s$J%=!<%9$G$3$N%3!<%I$r=q$/I,MW$,$"$j$^$9!#e(B
|e$B!Ve(Bnil e$B$NFCJL07$$$r$J$/$9!W$H$$$&0l4S@-$N$?$a$K!"MxJX@-$,5>@7$K$J$j$9$.e(B
|e$B$@$H;W$$$^$9!#e(B
|
|e$B$J$N$G!"e(B
|
|1. 1.8 e$B$N5sF0$KLa$9e(B (ENV e$B$@$1e(B nil e$B$rFCJL07$$$9$ke(B)
|2. 1.8 e$B$Ne(B ENV#[]= e$B$HF1$85sF0$r$9$k%a%=%C%I$rDs6!$9$ke(B (ENV#assign e$B$H$+e(B)
|
|e$B$N$I$C$A$+$r$9$k$N$O$I$&$G$7$g$&$+!#e(B

e$B$*$C$7$c$k$3$H$O$b$C$H$b$J$N$GA0<T$NBP1~$r$7$^$9!#e(B

3

e$B%A%1%C%He(B #584 e$B$,99?7$5$l$^$7$?!#e(B (by Yukihiro M.)

e$B%9%F!<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

Applied in changeset r19463.

http://redmine.ruby-lang.org/issues/show/584