# \[Bug #2395\] $B2D;k@-$NJQ99$K$h$k(B alias $B$5$l$?%a%=%C%I$NL58z2=(B

**URL:** <https://www.ruby-forum.com/t/bug-2395-b2d-k-njq99-k-h-k-b-alias-b-5-l-a-c-i-nl58z2-b/179393>\
**Category:** Development\
**Created:** [November 24, 2009, 3:30am UTC](https://www.ruby-forum.com/t/bug-2395-b2d-k-njq99-k-h-k-b-alias-b-5-l-a-c-i-nl58z2-b/179393 "2009-11-24T03:30:10Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [November 24, 2009, 3:30am UTC](https://www.ruby-forum.com/t/bug-2395-b2d-k-njq99-k-h-k-b-alias-b-5-l-a-c-i-nl58z2-b/179393/1 "2009-11-24T03:30:10Z")

</div>

Bug #2395: e$B2D;k@-$NJQ99$K$h$ke(B alias e$B$5$l$?%a%=%C%I$NL58z2=e(B  
[http://redmine.ruby-lang.org/issues/show/2395](http://redmine.ruby-lang.org/issues/show/2395)

e$B5/I\<\<Te(B: \_ wanabe  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Low  
e$B%+%F%4%je(B: core  
ruby -v: ruby 1.9.2dev (2009-11-21 trunk 25882) [i386-mingw32], ruby  
1.8.8dev (2009-11-24 revision 25892) [i386-mingw32]

alias e$B$5$l$?85$N%a%=%C%I$re(B undef e$B$9$k$H$-!“e(Balias  
e$B$NA0$K2D;k@-$rJQ99$9$k=hM}$,$”$k$He(B  
e$B$^$?85$KLa$7$F$be(B alias e$B@h$N%a%=%C%I$,8F$Y$J$/$J$j$^$9!#e(B  
rb\_export\_method() e$BCf$Ne(B rb\_add\_method()  
e$B$K$h$k8=\>]$N$h$&$G$9!#e(B

$ cat test.rb  
class Foo  
def foo  
p :foo  
end  
class Bar0 \< Foo  
alias bar foo  
end  
class Bar1 \< Foo  
private :foo  
public :foo  
alias bar foo  
end  
undef foo

Bar0.new.bar  
Bar1.new.bar  
end

$ ruby19/ruby -v test.rb  
ruby 1.9.2dev (2009-11-21 trunk 25882) [i386-mingw32]  
:foo  
test.rb:16:in `<class:Foo>': undefined method `bar’ for  
#Foo::Bar1:0xb90a48 (NoMethodError)  
from test.rb:1:in `’

$ ruby18/ruby -v test.rb  
ruby 1.8.8dev (2009-11-24 revision 25892) [i386-mingw32]  
:foo  
test.rb:16:in `bar': super: no superclass method `foo’ for  
#Foo::Bar1:0x28a4f78 (NoMethodError)  
from test.rb:16

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [November 24, 2009, 4:59am UTC](https://www.ruby-forum.com/t/bug-2395-b2d-k-njq99-k-h-k-b-alias-b-5-l-a-c-i-nl58z2-b/179393/2 "2009-11-24T04:59:09Z")

</div>

e$B1sF#$G$9!#e(B

2009e$BG/e(B11e$B7ne(B24e$BF|e(B11:29 \_ wanabe [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> alias e$B$5$l$?85$N%a%=%C%I$re(B undef e$B$9$k$H$-!“e(Balias e$B$NA0$K2D;k@-$rJQ99$9$k=hM}$,$”$k$He(B  
> e$B$^$?85$KLa$7$F$be(B alias e$B@h$N%a%=%C%I$,8F$Y$J$/$J$j$^$9!#e(B  
> rb\_export\_method() e$BCf$Ne(B rb\_add\_method() e$B$K$h$k8=\>]$N$h$&$G$9!#e(B

e$B4q6x$J$3$H$K!"F1$8%?%$%\_%s%0$G$[$\F1$8LdBj$KG:$s$G$$$^$7$?!#e(B

$ ruby19 -e ‘public :eval; alias foo eval; foo “p 1”’  
-e:1:in `<main>': undefined method `foo’ for main:Object  
(NoMethodError)

wanabe e$B$5$s$NDs5/$7$F$$$kLdBj$Oe(B 2 e$B$D$KJ,$1$i$l$k$H;W$$$^$9!#e(B

1. bar e$B$,e(B foo e$B$Ne(B alias e$B$G!"e(Bfoo e$B$,e(B ZSUPER  
e$B$@$C$?:]!“e(Bfoo e$B$G$O$J$/e(B bar e$B$re(B  
e$BC5$7$F$7$^$&e(B (1.9 e$B$@$1!”;d$,G:$s$G$$$?$N$O$3$C$Ae(B)

class C  
private  
def foo; “FOO”; end  
def bar; “BAR”; end  
end  
class D \< C  
public :foo  
alias bar foo  
end  
p D.new.public\_send(:bar) #=\> “BAR”

# send e$B$@$H:GE,2=$G@5$7$/F0$$$F$7$^$&!"e(Bpublic\_send

e$B$@$HH/\>I$9$ke(B

1. e$BF1$8%/%i%9$Ge(B alias  
e$B$r:n$C$?$i%a%=%C%I\<BBN$N\<BBN$,%3%T!\<$5$l$k$N$Ke(B  
e$B7Q\>5@h$Ge(B alias e$B$r:n$C$?$i\<BBN$O%3%T!\<$5$l$J$$e(B (1.8  
e$B$be(B 1.9 e$B$be(B)

class C  
private  
def foo; “foo”; end  
alias bar foo  
public :bar  
end  
class D \< C  
public :foo  
alias baz foo  
end  
class C  
undef foo  
end  
p D.new.bar #=\> “foo”  
p D.new.baz #=\> NoMethodError

1. e$B$Oe(B 1.9 e$B$N%P%0$@$H;W$$$^$9!#%Q%C%A$r$D$1$^$9e(B  
(e$B$?$@$7$^$@%F%9%He(B  
e$B$7$F$^$;$se(B) e$B!#e(B2)  
e$B$O;EMM$+$I$&$+J9$+$J$$$H$o$+$j$^$;$s!#e(B

# Index: vm\_eval.c

— vm\_eval.c (revision 25898)  
+++ vm\_eval.c (working copy)  
@@ -105,6 +105,7 @@  
}  
case VM\_METHOD\_TYPE\_ZSUPER: {  
klass = RCLASS\_SUPER(klass);

- id = me-\>def-\>original\_id;  
if (!klass || !(me = rb\_method\_entry(klass, id))) {  
return method\_missing(recv, id, argc, argv, NOEX\_SUPER);  
}  
Index: vm\_insnhelper.c  
===================================================================  
— vm\_insnhelper.c (revision 25898)  
+++ vm\_insnhelper.c (working copy)  
@@ -548,6 +548,7 @@  
}  
case VM\_METHOD\_TYPE\_ZSUPER:{  
VALUE klass = RCLASS\_SUPER(me-\>klass);

- id = me-\>def-\>original\_id;  
me = rb\_method\_entry(klass, id);

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [November 24, 2009, 5:10am UTC](https://www.ruby-forum.com/t/bug-2395-b2d-k-njq99-k-h-k-b-alias-b-5-l-a-c-i-nl58z2-b/179393/3 "2009-11-24T05:10:16Z")

</div>

e$B1sF#$G$9!#e(B

2009e$BG/e(B11e$B7ne(B24e$BF|e(B12:55 Yusuke ENDOH [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> public :foo  
> alias baz foo  
> end  
> class C  
> undef foo  
> end  
> p D.new.bar #=\> “foo”  
> p D.new.baz #=\> NoMethodError

(snip)

> 1. e$B$O;EMM$+$I$&$+J9$+$J$$$H$o$+$j$^$;$s!#e(B

e$B$3$C$A$O4V0c$$$G$7$?!#e(Bpublic e$B$de(B private e$B$r30$9$H!"e(B1.8  
e$B$G$be(B 1.9 e$B$G$be(B

class C  
def foo; “foo”; end  
alias bar foo  
end  
class D \< C  
alias baz foo  
end  
class C  
undef foo  
end  
p D.new.bar #=\> “foo”  
p D.new.baz #=\> “foo”

e$B$HLdBj$J$/F0$/$N$G!"$d$O$j2D;k@-$b$+$i$s$@LdBj$G$9$M!#e(B

e$B%9!\<%Q!\<%/%i%9$N%a%=%C%I$Ne(B public/private e$B$re(B ZSUPER  
e$B$G\<BAu$9$k$3$H$,e(B  
e$B860x$@$H;W$$$^$9$,!"$I$&D\>$7$?$b$N$G$7$g$&$M!#e(BZSUPER e$B$re(B  
alias e$B$9$k;~$Oe(B  
e$B%a%=%C%I\<BBN$rJ#@=$9$k!)e(B

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [November 24, 2009, 1:47pm UTC](https://www.ruby-forum.com/t/bug-2395-b2d-k-njq99-k-h-k-b-alias-b-5-l-a-c-i-nl58z2-b/179393/4 "2009-11-24T13:47:37Z")

</div>

e$B1sF#$G$9!#e(B

2009e$BG/e(B11e$B7ne(B24e$BF|e(B13:09 Yusuke ENDOH [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> e$B%9!\<%Q!\<%/%i%9$N%a%=%C%I$Ne(B public/private e$B$re(B ZSUPER e$B$G\<BAu$9$k$3$H$,e(B  
> e$B860x$@$H;W$$$^$9$,!"$I$&D\>$7$?$b$N$G$7$g$&$M!#e(BZSUPER e$B$re(B alias e$B$9$k;~$Oe(B  
> e$B%a%=%C%I\<BBN$rJ#@=$9$k!)e(B

e$B$3$C$A$r\<BAu$7$^$7$?!#e(B  
[ruby-dev:39760] e$B$N%3!\<%I$@$He(B :foo, :foo  
e$B$H=PNO$9$k$h$&$K$J$j$^$9!#e(B

e$B$3$N%Q%C%A$rEv$F$k$He(B original\_id e$B$H0c$&L\>A0$Ne(B ZSUPER  
e$B$J%a%=%C%I$OH/@8e(B  
e$B$7F@$J$/$J$k$O$:$J$N$G!"e(B[ruby-dev:39761]  
e$B$N%Q%C%A$OITMW$K$J$j$^$9!#e(B

make check  
e$B$G$b%(%i!\<$OA}$($J$+$C$?$N$G!"H?BP0U8+$,L5$1$l$P%3%\_%C%He(B  
e$B$7$h$&$H;W$$$^$9!#e(B

diff --git a/vm\_method.c b/vm\_method.c  
index 215db50…3b86713 100644  
— a/vm\_method.c  
+++ b/vm\_method.c  
@@ -858,7 +858,9 @@ rb\_method\_definition\_eq(const  
rb\_method\_definition\_t \*d1, const rb\_method\_defini  
void  
rb\_alias(VALUE klass, ID name, ID def)  
{

- VALUE target\_klass = klass;  
rb\_method\_entry\_t \*orig\_me;

- rb\_method\_flag\_t flag = NOEX\_UNDEF;

- again:  
orig\_me = search\_method(klass, def);

- if (orig\_me-\>def-\>type == VM\_METHOD\_TYPE\_ZSUPER) {

- klass = RCLASS\_SUPER(klass);

- def = orig\_me-\>def-\>original\_id;

- flag = orig\_me-\>flag;

- goto again;

- }

- rb\_add\_method\_me(klass, name, orig\_me, orig\_me-\>flag);

- if (flag == NOEX\_UNDEF) flag = orig\_me-\>flag;
- rb\_add\_method\_me(target\_klass, name, orig\_me, flag);  
}

/\*

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [January 13, 2010, 3:17pm UTC](https://www.ruby-forum.com/t/bug-2395-b2d-k-njq99-k-h-k-b-alias-b-5-l-a-c-i-nl58z2-b/179393/5 "2010-01-13T15:17:16Z")

</div>

e$B1sF#$G$9!#e(B

2010e$BG/e(B1e$B7ne(B13e$BF|e(B21:13 wanabe [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> > e$B$7$h$&$H;W$$$^$9!#e(B
> 
> e$B$9$_$^$;$s!"$3$N7o$I$&$J$j$^$7$?$G$7$g$&$+!#e(B  
> e$B:9$7;Y$($J$1$l$P%3%_%C%H$7$F$$$?$@$1$k$H$"$j$,$?$$$G$9!#e(B

e$B$9$C$+$jK:$l$F$$$?$s$G$9$,e(B (e$B$9$_$^$;$se(B)  
e$B!"@hF|%3%_%C%H$7$^$7$?e(B (r26255)e$B!#e(B

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [January 13, 2010, 1:14pm UTC](https://www.ruby-forum.com/t/bug-2395-b2d-k-njq99-k-h-k-b-alias-b-5-l-a-c-i-nl58z2-b/179393/6 "2010-01-13T13:14:20Z")

</div>

e$B%o%J%Y$H?=$7$^$9!#e(B

09/11/24 Yusuke ENDOH [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> 2009e$BG/e(B11e$B7ne(B24e$BF|e(B13:09 Yusuke ENDOH [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):
> 
> > e$B%9!\<%Q!\<%/%i%9$N%a%=%C%I$Ne(B public/private e$B$re(B ZSUPER e$B$G\<BAu$9$k$3$H$,e(B  
> > e$B860x$@$H;W$$$^$9$,!"$I$&D\>$7$?$b$N$G$7$g$&$M!#e(BZSUPER e$B$re(B alias e$B$9$k;~$Oe(B  
> > e$B%a%=%C%I\<BBN$rJ#@=$9$k!)e(B
> 
> e$B$3$C$A$r\<BAu$7$^$7$?!#e(B  
> [ruby-dev:39760] e$B$N%3!\<%I$@$He(B :foo, :foo e$B$H=PNO$9$k$h$&$K$J$j$^$9!#e(B  
> e$B!JCfN,!Ke(B  
> make check e$B$G$b%(%i!\<$OA}$($J$+$C$?$N$G!"H?BP0U8+$,L5$1$l$P%3%\_%C%He(B  
> e$B$7$h$&$H;W$$$^$9!#e(B

e$B$9$_$^$;$s!"$3$N7o$I$&$J$j$^$7$?$G$7$g$&$+!#e(B  
e$B:9$7;Y$($J$1$l$P%3%_%C%H$7$F$$$?$@$1$k$H$"$j$,$?$$$G$9!#e(B

---

<div class="post-metadata">

**Author:** ![SSwanabe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@SSwanabe](https://www.ruby-forum.com/u/SSwanabe)\
**Post date:** [January 13, 2010, 3:19pm UTC](https://www.ruby-forum.com/t/bug-2395-b2d-k-njq99-k-h-k-b-alias-b-5-l-a-c-i-nl58z2-b/179393/7 "2010-01-13T15:19:01Z")

</div>

e$B%A%1%C%He(B #2395 e$B$,99?7$5$l$^$7$?!#e(B (by Yusuke E.)

e$B%9%F!\<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B

## r26255

[http://redmine.ruby-lang.org/issues/show/2395](http://redmine.ruby-lang.org/issues/show/2395)