# Development

**URL:** https://www.ruby-forum.com/c/ruby/ruby-dev/14.md?page=127

[Latest](https://www.ruby-forum.com/latest.md) · [Categories](https://www.ruby-forum.com/categories.md) · [Tags](https://www.ruby-forum.com/tags.md)

**Page:** 128

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## [@a?, @a! interpolation](https://www.ruby-forum.com/t/a-a-interpolation/136607)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 4, 2008, 12:28pm UTC](https://www.ruby-forum.com/t/a-a-interpolation/136607 "2008-05-04T12:28:14Z")

</div>

e$B0J2\<$N$h$&$K!"e(B@a?, @a! e$B$,%$%s%9%?%s%9JQ?t$H$5$l$k$N$OJQ$G$Oe(B e$B$J$$$G$7$g$&$+!#e(B % ./ruby -ve ‘@a = “x”; p “\[#@a?\]\[#@a!\]”’ ruby 1.9.0 (2008-05-02 revision 16286) \[i686-linux\] -e:1: warning: instance var…

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## [Thread.current.key? nil](https://www.ruby-forum.com/t/thread-current-key-nil/136601)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 4, 2008, 9:34am UTC](https://www.ruby-forum.com/t/thread-current-key-nil/136601 "2008-05-04T09:34:40Z")

</div>

e$B0J2\<$N$h$&$K!“e(BThread.current.key? nil e$B$N5sF0$,%9%l%C%IJQ?t$,e(B e$B$”$k$+$I$&$+$GJQ$o$j$^$9!#e(B % ./ruby -ve ’ p Thread.current.key? nil Thread.current\[:a\] = 1 p Thread.current.key? nil ’ ruby 1.9.0 (200…

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## ["bb".tr\_s("^a", "c")](https://www.ruby-forum.com/t/bb-tr-s-a-c/136599)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 4, 2008, 8:18am UTC](https://www.ruby-forum.com/t/bb-tr-s-a-c/136599 "2008-05-04T08:18:25Z")

</div>

e$B0J2\<$N$h$&$Ke(B “bb”.tr\_s("^a", “c”) e$B$,e(B “cc” e$B$K$J$j$^$9!#e(B % ./ruby -ve ‘p “bb”.tr\_s("^a", “c”)’ ruby 1.9.0 (2008-05-02 revision 16285) \[i686-linux\] “cc” 1.8 e$B$G$Oe(B “c” e$B$K$J$j$^$9!#e(B % ruby-1.…

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## [Str.each\_line("")](https://www.ruby-forum.com/t/str-each-line/136595)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 4, 2008, 5:54am UTC](https://www.ruby-forum.com/t/str-each-line/136595 "2008-05-04T05:54:34Z")

</div>

each\_line e$B$K6h@Z$j$H$7$F6uJ8;zNs$rM?$($k$N$O%Q%i%0%i%U%b!\<%Ie(B e$B$H$$$&$d$D$GJ#?t$NO"B3$7$?2~9T$r6h@Z$j$H$9$k$b$N$@$C$?$H;W$&e(B e$B$N$G$9$,!"$R$H$D$N2~9T$G6h@Z$i$l$F$7$^$$$^$9!#e(B % ./ruby -ve ‘“a\\nb\\n\\nc\\nd\\n”…

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## [Module ::M in a module](https://www.ruby-forum.com/t/module-m-in-a-module/136593)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 4, 2008, 4:40am UTC](https://www.ruby-forum.com/t/module-m-in-a-module/136593 "2008-05-04T04:40:56Z")

</div>

e$B0J2\<$N$h$&$K!"e(Bmodule M2 e$B$NCf$Ke(B module ::M e$B$H=q$$$?;~!"e(B :: e$B$OL5;k$5$l$Fe(B M2::M e$B$,Dj5A$5$l$k$h$&$G$9!#e(B % ./ruby -ve ’ module M def self.m() p :m end end module M2 module ::M p self p M…

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## [(-1).div(2.0)](https://www.ruby-forum.com/t/1-div-2-0/136559)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 3, 2008, 5:44pm UTC](https://www.ruby-forum.com/t/1-div-2-0/136559 "2008-05-03T17:44:30Z")

</div>

(-1).div(2.0) e$B$,e(B 0 e$B$K$J$j$^$9!#e(B % ./ruby -ve ‘p((-1).div(2.0))’ ruby 1.9.0 (2008-05-02 revision 16277) \[i686-linux\] 0 e$B$7$+$7!"e(B(-1).divmod(2.0) e$B$de(B (-1).div(2) e$B$HHf3S$9$k$H!"e(B-1 e$B$,e(B …

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## [1 & 1.0](https://www.ruby-forum.com/t/1-1-0/136557)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 3, 2008, 5:35pm UTC](https://www.ruby-forum.com/t/1-1-0/136557 "2008-05-03T17:35:40Z")

</div>

e$B0J2\<$N$h$&$K@0?t$HIbF0\>.?tE@$N%S%C%HO@M}1i;;$,2DG=$J$N$O0U?^e(B e$B$5$l$?$3$H$J$s$G$7$g$&$+e(B? % ./ruby -ve ‘p 1 & 1.0’ ruby 1.9.0 (2008-05-02 revision 16277) \[i686-linux\] 1 e$B:81&$r5U$K$9$k$H%(%i!\<$K$J$j$^$9!#…

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## [Exception inconsistency of Fixnum#quo and Bignum#quo](https://www.ruby-forum.com/t/exception-inconsistency-of-fixnum-quo-and-bignum-quo/136552)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 3, 2008, 4:12pm UTC](https://www.ruby-forum.com/t/exception-inconsistency-of-fixnum-quo-and-bignum-quo/136552 "2008-05-03T16:12:45Z")

</div>

Fixnum#quo e$B$He(B Bignum#quo e$B$Ke(B nil e$B$rEO$7$?;~!"H/@8$9$kNc30$,0\[e(B e$B$J$j$^$9!#e(B % ./ruby -ve ‘p 0x3fffffff.quo(nil)’ ruby 1.9.0 (2008-05-02 revision 16277) \[i686-linux\] -e:1:in /': nil can't be coerc…

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## [Uniq with subclass of Array](https://www.ruby-forum.com/t/uniq-with-subclass-of-array/136545)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 3, 2008, 12:53pm UTC](https://www.ruby-forum.com/t/uniq-with-subclass-of-array/136545 "2008-05-03T12:53:50Z")

</div>

e$B0J2\<$N$h$&$K!"e(BArray e$B$N%5%V%/%i%9$Ke(B uniq e$B$r8F$S=P$9$H!"e(BArray e$B$N%$%s%9%?%s%9$,JV$C$F$-$^$9!#e(B % ./ruby -ve ‘class A \< Array; end; p A\[1,2\].uniq.class’ ruby 1.9.0 (2008-05-02 revision 16277) \[i686…

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## [Puts recursive array](https://www.ruby-forum.com/t/puts-recursive-array/136540)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 3, 2008, 10:24am UTC](https://www.ruby-forum.com/t/puts-recursive-array/136540 "2008-05-03T10:24:14Z")

</div>

x = \[0,1,2,3,4,5\]; x \<\< x e$B$H$7$F:n$C$?:F5"E\*$JG\[Ns$re(B puts e$B$9e(B e$B$k$He(B \[…\] e$B$,$$$/$D$b=P$F$-$^$9!#e(B % ./ruby -ve ‘x = \[0,1,2,3,4,5\]; x \<\< x; puts x’ ruby 1.9.0 (2008-05-02 revision 16276) \[i686-linux\] …

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## [Dbm::version](https://www.ruby-forum.com/t/dbm-version/136441)

<div class="topic-metadata">

**Author:** [@okkez](https://www.ruby-forum.com/u/okkez)\
**Replies:** 2\
**Last updated:** [May 2, 2008, 5:52pm UTC](https://www.ruby-forum.com/t/dbm-version/136441 "2008-05-02T17:52:08Z")

</div>

okkez e$B$G$9!#e(B DBM::VERSION e$B$H$$$&Dj?t$NDj5A$,$\*$+$7$$$h$&$J5$$,$7$^$9!#e(B 1.8.7 e$B$G$be(B 1.9.0 e$B$HF1$8$h$&$K$9$k$N$,NI$$$H;W$&$N$G$9$,$$$+$,$G$7$g$&$+!)e(B e$B$b$&\<jCY$l$G$7$g$&$+!)e(B 1.8.0-1.8.7 e$B$G$…

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## [Uninitialized \_tag.retval value is used](https://www.ruby-forum.com/t/uninitialized-tag-retval-value-is-used/136489)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 2, 2008, 5:16pm UTC](https://www.ruby-forum.com/t/uninitialized-tag-retval-value-is-used/136489 "2008-05-02T17:16:04Z")

</div>

e$B5$$,$D$$$?$N$G$9$,!"e(B\_tag.retval e$B$r=i4|2=$7$J$$$G;H$&$3$H$,$"e(B e$B$k$h$&$G$9!#e(B e$B0J2\<$N$h$&$Ke(B TH\_PUSH\_TAG(th); e$B$ND\>8e$G!"$^$@e(B \_tag e$B$,=i4|2=$5e(B e$B$l$F$$i$:!"$I$s$JCM$G$b$$+$7$/$J$$\>uBV$G!"…

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## [/(.)(.)/.match("ab").select {|v| true } is empty](https://www.ruby-forum.com/t/match-ab-select-v-true-is-empty/136365)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 4\
**Last updated:** [May 1, 2008, 5:32pm UTC](https://www.ruby-forum.com/t/match-ab-select-v-true-is-empty/136365 "2008-05-01T17:32:11Z")

</div>

e$B0J2\<$N$h$&$K!"e(BMatchData#select e$B$G%V%m%C%/$,\>o$K??$J$N$K7k2Le(B e$B$,6u$K$J$k$N$OJQ$G$O$J$$$G$7$g$&$+!#e(B % ./ruby -ve ‘p(/(.)(.)/.match(“ab”).select {|v| true })’ ruby 1.9.0 (2008-05-01 revision 16250) \[i686…

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## [1.div(0.0) is -2147483648](https://www.ruby-forum.com/t/1-div-0-0-is-2147483648/136374)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 1, 2008, 10:44am UTC](https://www.ruby-forum.com/t/1-div-0-0-is-2147483648/136374 "2008-05-01T10:44:02Z")

</div>

e$B0J2\<$N$h$&$K!"e(B1.div(0.0) e$B$,e(B -2147483648 e$B$K$J$k$N$OJQ$J$s$8$ce(B e$B$J$$$G$7$g$&$+!#e(B % ./ruby -ve ‘p 1.div(0.0)’ ruby 1.9.0 (2008-05-01 revision 16250) \[i686-linux\] -2147483648

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## [(0..4).step(obj with to\_int)](https://www.ruby-forum.com/t/0-4-step-obj-with-to-int/136371)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 1, 2008, 10:18am UTC](https://www.ruby-forum.com/t/0-4-step-obj-with-to-int/136371 "2008-05-01T10:18:16Z")

</div>

e$B0J2\<$N$h$&$K!"e(Bstep e$B$N0z?t$Ke(B to\_int e$B$r$b$D@0?t$b$I$-$rM?$($ke(B e$B$HNc30$K$J$j$^$9!#e(B % ./ruby -ve ‘o=Object.new; def o.to\_int() 1 end; (0…4).step(o) {|v| p v }’ ruby 1.9.0 (2008-05-01 revision 1625…

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## [Step can't be 0 by (0..10).step(0.9)](https://www.ruby-forum.com/t/step-cant-be-0-by-0-10-step-0-9/136367)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 1, 2008, 9:36am UTC](https://www.ruby-forum.com/t/step-cant-be-0-by-0-10-step-0-9/136367 "2008-05-01T09:36:00Z")

</div>

e$B0J2\<$N$h$&$K!"e(B(0…10).step(0.9) {|x| p x } e$B$,Nc30$K$J$j$^$9!#e(B % ./ruby -ve ‘(0…10).step(0.9) {|x| p x }’ ruby 1.9.0 (2008-05-01 revision 16250) \[i686-linux\] -e:1:in step': step can't be 0 (ArgumentError) f…

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## [O = Object.new; def o.to\_hash() {1=\>2} end; p Hash\[o\]](https://www.ruby-forum.com/t/o-object-new-def-o-to-hash-1-2-end-p-hash-o/136363)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 1, 2008, 9:06am UTC](https://www.ruby-forum.com/t/o-object-new-def-o-to-hash-1-2-end-p-hash-o/136363 "2008-05-01T09:06:10Z")

</div>

e$B0J2\<$N7k2L$,e(B {} e$B$K$J$k$N$OJQ$8$c$J$$$G$7$g$&$+!#e(B % ./ruby -ve ‘o = Object.new; def o.to\_hash() {1=\>2} end; p Hash\[o\]’ ruby 1.9.0 (2008-05-01 revision 16248) \[i686-linux\] {}

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## [ENV.delete\_if](https://www.ruby-forum.com/t/env-delete-if/136361)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 1, 2008, 8:12am UTC](https://www.ruby-forum.com/t/env-delete-if/136361 "2008-05-01T08:12:23Z")

</div>

ENV.delete\_if e$B$,e(B ENV e$B\<+?H$rJV$9$N$OJQ$J$s$8$c$J$$$G$7$g$&$+!#e(B % ./ruby -ve ‘p ENV.delete\_if.equal?(ENV)’ ruby 1.9.0 (2008-05-01 revision 16248) \[i686-linux\] true

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## [0x3fffffff.div(2.0) and 0x40000001.div(2.0)](https://www.ruby-forum.com/t/0x3fffffff-div-2-0-and-0x40000001-div-2-0/136359)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [May 1, 2008, 6:49am UTC](https://www.ruby-forum.com/t/0x3fffffff-div-2-0-and-0x40000001-div-2-0/136359 "2008-05-01T06:49:23Z")

</div>

e$B0J2\<$N$h$&$K!"e(B0x3fffffff.div(2.0) e$B$He(B 0x40000001.div(2.0) e$B$Ge(B e$B\>.?tE@0J2\<$,$D$/$+$I$&$+$,0c$$$^$9!#e(B % ./ruby -e ‘p 0x3fffffff.div(2.0)’ 536870911 % ./ruby -e ‘p 0x40000001.div(2.0)’ 536870912.5 …

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## [Xmlrpc and 64bit systems](https://www.ruby-forum.com/t/xmlrpc-and-64bit-systems/136307)

<div class="topic-metadata">

**Author:** [@NARUSES\_Yui](https://www.ruby-forum.com/u/NARUSES_Yui)\
**Replies:** 0\
**Last updated:** [April 30, 2008, 6:31pm UTC](https://www.ruby-forum.com/t/xmlrpc-and-64bit-systems/136307 "2008-04-30T18:31:03Z")

</div>

e$B@.@%$G$9!#e(B xmlrpc e$B$K$Oe(B 32bit e$B0J\>e$N@0?t$r;}$F$J$$$h$&$K$9$k@\_Dj$,$"$j$^$9!#e(B config.rb # allows integers greater than 32-bit if true ENABLE\_BIGINT = false e$B$7$+$7!"3:EvItJ,$N%3!\<%I$,0J2\<$N…

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## [0\*\*-1 == 0?](https://www.ruby-forum.com/t/0-1-0/136266)

<div class="topic-metadata">

**Author:** [@Yukihiro\_M](https://www.ruby-forum.com/u/Yukihiro_M)\
**Replies:** 9\
**Last updated:** [April 30, 2008, 5:27pm UTC](https://www.ruby-forum.com/t/0-1-0/136266 "2008-04-30T17:27:34Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B r14005 e$B$Ge(B 14005 ko1 assert\_equal(0\*\*-1 == 0, false) e$B$H$$$&%F%9%H$,2C$($i$l$F$$$^$9$,!"e(B0\*\*-1e$B$C$FK\\Ev$K%\<%m$J$s$G$7$ge(B e$B$&$+!)e(B e$B\<j85$N=hM}7O$Ge(B0e$B…

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## [Gem.const\_missing causes infinite loop](https://www.ruby-forum.com/t/gem-const-missing-causes-infinite-loop/136168)

<div class="topic-metadata">

**Author:** [@sheepman](https://www.ruby-forum.com/u/sheepman)\
**Replies:** 0\
**Last updated:** [April 29, 2008, 4:19pm UTC](https://www.ruby-forum.com/t/gem-const-missing-causes-infinite-loop/136168 "2008-04-29T16:19:27Z")

</div>

e$B$3$s$P$s$Oe(B sheepman e$B$G$9!#e(B trunk e$B$Ge(B Gem e$B$KDj5A$5$l$F$$$J$$Dj?t$r8F$V$HL58B%k!\<%W$K$J$j$^$9!#e(B $ ruby-1.9 -v ruby 1.9.0 (2008-04-28 revision 15721) \[i686-linux\] $ ruby-1.9 -ve ‘p Gem::A’ /usr/…

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## [Regexp match confused by thread](https://www.ruby-forum.com/t/regexp-match-confused-by-thread/135580)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 1\
**Last updated:** [April 29, 2008, 7:20am UTC](https://www.ruby-forum.com/t/regexp-match-confused-by-thread/135580 "2008-04-29T07:20:03Z")

</div>

e$B0J2\<$N%W%m%0%i%\`$G!"e(B$~.size e$B$O!"e(B/((ab)(ab))\*b/ e$B$K$O3g8L$,e(B 3e$B$DF~$C$F$$$k$?$a!"e(B4 e$B$rI=\<($9$k$O$:$J$N$G$9$,!"e(B1 e$B$,I=\<($5$le(B e$B$^$9!#e(B % ./ruby -ve ’ Thread.new { loop { // =~ “abc” …

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## [Floating point exception (core dumped) ./ruby -ve 'r = Marshal.load("\\x04\\bU:\\rRational\[\\ai\\x06i\\x0](https://www.ruby-forum.com/t/floating-point-exception-core-dumped-ruby-ve-r-marshal-load-x04-bu-rrational-ai-x06i-x0/136034)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 0\
**Last updated:** [April 28, 2008, 10:19am UTC](https://www.ruby-forum.com/t/floating-point-exception-core-dumped-ruby-ve-r-marshal-load-x04-bu-rrational-ai-x06i-x0/136034 "2008-04-28T10:19:42Z")

</div>

e$B0J2\<$N$h$&$K$9$k$He(B floating point exception e$B$K$J$j$^$9!#e(B % ./ruby -ve ‘r = Marshal.load("\\x04\\bU:\\rRational\[\\ai\\x06i\\x05"); r + r’ ruby 1.9.0 (2008-04-28 revision 16229) \[i686-linux\] -e:1: warning: useles…

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## [IPv6 support for mswin](https://www.ruby-forum.com/t/ipv6-support-for-mswin/135915)

<div class="topic-metadata">

**Author:** [@MSKozuka](https://www.ruby-forum.com/u/MSKozuka)\
**Replies:** 3\
**Last updated:** [April 28, 2008, 9:58am UTC](https://www.ruby-forum.com/t/ipv6-support-for-mswin/135915 "2008-04-28T09:58:14Z")

</div>

ruby-dev MLe$B$N3’MM!"$O$8$a$^$7$F!#e(B e$B\>.DM$H$$$$$^$9!#e(B e$B8=:\_!“e(B1.8e$B7O!“e(B1.9e$B7O6&$K!“e(Bmswine$B$G$O@596K!$G$Oe(BIPv6e$B$,e(B e$B$&$^$/;H$($:e(B(e$B%X%C%@$,ITE,@Z$J$?$ae(Bipv6e$B$NM-L5$,\>o$K\<:GT$9$ke(…

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## [Method#name](https://www.ruby-forum.com/t/method-name/136011)

<div class="topic-metadata">

**Author:** [@Kazuhiro\_NISHIYAMA](https://www.ruby-forum.com/u/Kazuhiro_NISHIYAMA)\
**Replies:** 0\
**Last updated:** [April 28, 2008, 3:14am UTC](https://www.ruby-forum.com/t/method-name/136011 "2008-04-28T03:14:08Z")

</div>

e$B@\>;3OB9-$G$9!#e(B Method#namee$B$Oe(B1.9e$B$G$be(BStringe$B$rJV$9$N$O0U?^$7$?F0:n$G$7$g$&$+e(B? methods.include?(method(:method).name)e$B$N$h$&$K;H$($k$3$H$re(B e$BA\[Dj$7$F$$$k$N$J$ie(BSymbole$B$NJ}$,NI$$$N$+$J$H;W…

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## [make$B$G%(%i!\<(B](https://www.ruby-forum.com/t/make-b-g-i-b/135975)

<div class="topic-metadata">

**Author:** [@unknown](https://www.ruby-forum.com/u/unknown)\
**Replies:** 1\
**Last updated:** [April 27, 2008, 1:36pm UTC](https://www.ruby-forum.com/t/make-b-g-i-b/135975 "2008-04-27T13:36:51Z")

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e$B$k$S$-$A$G$9!#e(B svne$B:G?7HG$Ne(BRuby 1.9e$B$Ne(Bmakee$B$G%(%i!\<$K$J$j$^$9!#e(B $ uname -a Linux meg 2.6.22-2-686 #1 SMP Fri Aug 31 00:24:01 UTC 2007 i686 GNU/Linux $ gcc --version gcc (GCC) 4.1.2 20061115 (pr…

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## [Floating point exception (core dumped) ./ruby -ve 'r = 0\*\*-1; p r + r'](https://www.ruby-forum.com/t/floating-point-exception-core-dumped-ruby-ve-r-0-1-p-r-r/135962)

<div class="topic-metadata">

**Author:** [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Replies:** 1\
**Last updated:** [April 27, 2008, 12:19pm UTC](https://www.ruby-forum.com/t/floating-point-exception-core-dumped-ruby-ve-r-0-1-p-r-r/135962 "2008-04-27T12:19:51Z")

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e$B0J2\<$N$h$&$K$9$k$H!"e(Bfloating point exception e$B$K$J$j$^$9!#e(B % ./ruby -ve ‘r = 0\*\*-1; p r + r’ ruby 1.9.0 (2008-04-26 revision 16213) \[i686-linux\] zsh: floating point exception (core dumped) ./ruby -ve 'r = …

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## [Class variable on singleton class](https://www.ruby-forum.com/t/class-variable-on-singleton-class/135967)

<div class="topic-metadata">

**Author:** [@SASADA\_Koichi](https://www.ruby-forum.com/u/SASADA_Koichi)\
**Replies:** 0\
**Last updated:** [April 27, 2008, 7:06am UTC](https://www.ruby-forum.com/t/class-variable-on-singleton-class/135967 "2008-04-27T07:06:26Z")

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e$B!!$5$5$@$G$9!%e(B e$B!!e(Bsingleton class e$B$KDj5A$7$?e(B class variable e$B$O!$$I$&$"$D$+$C$?$b$N$Ge(B e$B$7$g$&$+!%e(B class C obj = Object.new @@vs = :Cvs class \<\< obj @@vs = :objvs # (A) end class \<\< o…

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## [Patch for ruby-dev:34236](https://www.ruby-forum.com/t/patch-for-ruby-dev-34236/135273)

<div class="topic-metadata">

**Author:** [@wanabe](https://www.ruby-forum.com/u/wanabe)\
**Replies:** 6\
**Last updated:** [April 27, 2008, 5:56am UTC](https://www.ruby-forum.com/t/patch-for-ruby-dev-34236/135273 "2008-04-27T05:56:19Z")

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e$B%o%J%Y$H?=$7$^$9!#e(B \[ruby-dev:34236\]e$B$KBP$9$k%Q%C%A$r=q$-$^$7$?!#e(B Proc e$B%\*%V%8%’%/%H$N:n@.$5$l$?0LCV$HL54X78$Ke(B module\_eval e$BCf$G$N%a%=%C%IDj5A$,$G$-$k$h$&$K$J$j$^$9!#e(B Index: eval.c — eval.c (revi…

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