# \[Bug #2658\] rubyspec: Ruby character strings interpolates the return value of Object#inspect, withou

**URL:** <https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308>\
**Category:** Development\
**Created:** [January 26, 2010, 12:40pm UTC](https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308 "2010-01-26T12:40:21Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![Yusuke\_E](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f08c70/32.png) [@Yusuke\_E](https://www.ruby-forum.com/u/Yusuke_E)\
**Post date:** [January 26, 2010, 12:40pm UTC](https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308/1 "2010-01-26T12:40:21Z")

</div>

Bug #2658: rubyspec: Ruby character strings interpolates the return  
value of Object#inspect, without ivars, if Object#to\_s does not return a  
String instance ERROR  
[http://redmine.ruby-lang.org/issues/show/2658](http://redmine.ruby-lang.org/issues/show/2658)

e$B5/I\<\<Te(B: Yusuke E.  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Normal  
e$BC4Ev\<Te(B: Yukihiro M., e$B%+%F%4%je(B: core, Target version:  
1.9.2  
ruby -v: ruby 1.9.2dev (2010-01-26 trunk 26425) [i686-linux]

e$B$^$D$b$H$5$se(B  
e$B1sF#$G$9!#e(B

rubyspec e$B$N0J2\<$N%(%i!\<$rD4$Y$F$\_$^$7$?!#e(B

1. 

Ruby character strings interpolates the return value of Object#inspect,  
without ivars, if Object#to\_s does not return a String instance ERROR  
ArgumentError: wrong number of arguments(2 for 1)  
/home/mame/work/ruby/spec/rubyspec/language/string\_spec.rb:158:in `[]' /home/mame/work/ruby/spec/rubyspec/language/string_spec.rb:158:in `block  
(2 levels) in \<top (required)\>’  
/home/mame/work/ruby/spec/rubyspec/language/string\_spec.rb:5:in `\<top  
(required)\>’

r25428 e$B$,860x$G$9!#$3$N%3%\_%C%H$G$O!"e(B

- rdoc e$B$NJ8\>O$,2u$l$F$$$^$9!#e(B

- rdoc e$B$K$h$k$H!"!Ve(Bto\_s e$B$,e(B override e$B$5$l$Fe(B  
_e$B$$$J$$e(B_ e$B$H$-$Oe(B to\_s e$B$r;H$&!We(B  
e$B$H$$$&;EMM$@$H;W$$$^$9$,!"8=:\_$Oe(B to\_s e$B$,e(B override  
e$B$5$l$Fe(B _e$B$$$ke(B_ e$B$H$-$Ke(B  
to\_s e$B$r;H$&$h$&$K$J$C$F$$$k$H;W$$$^$9!#e(B

e$B$H$$$&$3$H$G!"0J2\<$N%Q%C%A$r%3%\_%C%H$r$7$F$b$$$$$G$7$g$&$+!#e(B  
e$B$3$N%Q%C%A$K$h$C$F\>e5-$Ne(B rubyspec  
e$B$N%(%i!\<$,\>C$($k$3$H$r3NG’$7$F$$$^$9!#e(B

diff --git a/object.c b/object.c  
index 73e5bd1…441f226 100644  
— a/object.c  
+++ b/object.c  
@@ -367,8 +367,6 @@ inspect\_obj(VALUE obj, VALUE str, int recur)

- 

```
obj.inspect => string

```

- 
- Returns a string containing a human-readable representation of

- 
  - _obj_. If not overridden and no instance variables, uses the

- 
  - `to_s` method to generate the string.
  - _obj_. If not overridden, uses the `to_s` method  
to
  - generate the string.
  - 

@@ -381,7 +379,7 @@ extern int rb\_obj\_basic\_to\_s\_p(VALUE);  
static VALUE  
rb\_obj\_inspect(VALUE obj)  
{

- if (TYPE(obj) == T\_OBJECT && rb\_obj\_basic\_to\_s\_p(obj)) {

- if (TYPE(obj) == T\_OBJECT && !rb\_obj\_basic\_to\_s\_p(obj)) {  
int has\_ivar = 0;  
VALUE \*ptr = ROBJECT\_IVPTR(obj);  
long len = ROBJECT\_NUMIV(obj);

–  
Yusuke ENDOH [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

---

<div class="post-metadata">

**Author:** ![Yusuke\_E](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f08c70/32.png) [@Yusuke\_E](https://www.ruby-forum.com/u/Yusuke_E)\
**Post date:** [January 26, 2010, 1:50pm UTC](https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308/2 "2010-01-26T13:50:36Z")

</div>

2010e$BG/e(B1e$B7ne(B26e$BF|e(B20:39 Yusuke E.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> r25428 e$B$,860x$G$9!#$3$N%3%\_%C%H$G$O!"e(B
> 
> - rdoc e$B$NJ8\>O$,2u$l$F$$$^$9!#e(B
> 
> - rdoc e$B$K$h$k$H!"!Ve(Bto\_s e$B$,e(B override e$B$5$l$Fe(B _e$B$$$J$$e(B_ e$B$H$-$Oe(B to\_s e$B$r;H$&!We(B  
> e$B$H$$$&;EMM$@$H;W$$$^$9$,!"8=:\_$Oe(B to\_s e$B$,e(B override e$B$5$l$Fe(B _e$B$$$ke(B_ e$B$H$-$Ke(B  
> to\_s e$B$r;H$&$h$&$K$J$C$F$$$k$H;W$$$^$9!#e(B

override e$B$5$l$F$ke(B to\_s e$B$O3F%/%i%9$KFC2=$7$?$o$+$j$d$9$$e(B to\_s  
e$B$@$m$&$+$ie(B  
inspect e$B$H$7$F$O$=$C$A$r;H$&$C$F$$$&OC$J$s$8$c$J$$$G$9$+!#e(B

e$B$=$l$K!"e(Boverride e$B$5$l$F$$$J$$$H$-$Ke(B to\_s  
e$B$r;H$&$C$F$$$&$J$i!“e(B  
e$B%a%=%C%I8F$S=P$7$rDL$7$Fe(B dynamic binding  
e$B$K$9$k0UL#$O$”$j$^$;$s$h$M!#e(B

---

<div class="post-metadata">

**Author:** ![Yusuke\_E](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f08c70/32.png) [@Yusuke\_E](https://www.ruby-forum.com/u/Yusuke_E)\
**Post date:** [January 26, 2010, 2:42pm UTC](https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308/3 "2010-01-26T14:42:08Z")

</div>

2010e$BG/e(B1e$B7ne(B26e$BF|e(B21:49 Tanaka A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> override e$B$5$l$F$ke(B to\_s e$B$O3F%/%i%9$KFC2=$7$?$o$+$j$d$9$$e(B to\_s e$B$@$m$&$+$ie(B  
> inspect e$B$H$7$F$O$=$C$A$r;H$&$C$F$$$&OC$J$s$8$c$J$$$G$9$+!#e(B
> 
> e$B$=$l$K!"e(Boverride e$B$5$l$F$$$J$$$H$-$Ke(B to\_s e$B$r;H$&$C$F$$$&$J$i!“e(B  
> e$B%a%=%C%I8F$S=P$7$rDL$7$Fe(B dynamic binding e$B$K$9$k0UL#$O$”$j$^$;$s$h$M!#e(B

e$B3N$+$K!#$=$&$$$&$3$H$J$i!"e(Brdoc e$B$N4V0c$$$G$9$+$M!#e(B

diff --git a/object.c b/object.c  
index 73e5bd1…ab00efd 100644  
— a/object.c  
+++ b/object.c  
@@ -367,10 +367,8 @@ inspect\_obj(VALUE obj, VALUE str, int recur)

- 

```
obj.inspect => string

```

- 
- Returns a string containing a human-readable representation of

- 
  - _obj_. If not overridden and no instance variables, uses the

- 
  - _obj_. If `to_s<\code> is overridden, uses the`
`

to_s method to generate the string.
`
`
`
`
`
`

obj. If not overridden, uses the to_s method
to

generate the string.

```
[1, 2, 3..4, 'five'].inspect #=> "[1, 2, 3..4, \"five\"]"

```

```
Time.new.inspect #=> "2008-03-08 19:43:39 +0900"

```

e$B5sF0$O8=>u$N$^$^$K$9$k$H$7$F!"e(B

e$B$3$N5sF0$Oe(B 1.9.2 e$B$+$i$N;EMMJQ99e(B (1.9.1 e$B$O$=$N$^$^e(B)
e$B$3$N5sF0$Oe(B 1.9 e$B$+$i$N;EMMJQ99e(B (1.9.1
e$B$K$b%P%C%/%]!<%H$9$ke(B)
e$B$3$N5sF0$Oe(B 1.8/1.9 e$B$N;EMMe(B (1.8.x
e$B$K$b%P%C%/%]!<%H$9$ke(B)

e$B$N$I$l$H$9$Y$-$G$7$g$&$+!#e(Brubyspec
e$B$N=$@50MMj$NFbMF$K1F6A$7$^$9!#e(B
(1.8 e$B$Ne(B rb_obj_inspect e$B$Ne(B rdoc
e$B$H5sF0$,$"$C$F$J$$$N$G!"e(B1.8 e$B$K$be(B
e$B$J$s$i$+$N=$@5$,I,MW$@$H;W$$$^$9!#e(B)`

---

<div class="post-metadata">

**Author:** ![Yusuke\_E](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f08c70/32.png) [@Yusuke\_E](https://www.ruby-forum.com/u/Yusuke_E)\
**Post date:** [January 27, 2010, 10:30am UTC](https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308/4 "2010-01-27T10:30:01Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:40164] Re: [Bug #2658] rubyspec: Ruby  
character strings interpolates the return value of Object#inspect,  
without ivars, if Object#to\_s does not return a String instance ERROR”  
on Tue, 26 Jan 2010 22:41:55 +0900, Yusuke ENDOH [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
writes:

|\> override e$B$5$l$F$ke(B to\_s e$B$O3F%/%i%9$KFC2=$7$?$o$+$j$d$9$$e(B to\_s e$B$@$m$&$+$ie(B  
|\> inspect e$B$H$7$F$O$=$C$A$r;H$&$C$F$$$&OC$J$s$8$c$J$$$G$9$+!#e(B

|e$B3N$+$K!#$=$&$$$&$3$H$J$i!"e(Brdoc e$B$N4V0c$$$G$9$+$M!#e(B

e$B$“!\<!”$=$&$$$&$3$H$+!#4V0c$C$F$k$N$Oe(BRDoce$B$NJ}$G$9$M!#e(B

|e$B5sF0$O8=\>u$N$^$^$K$9$k$H$7$F!"e(B  
|  
|1. e$B$3$N5sF0$Oe(B 1.9.2 e$B$+$i$N;EMMJQ99e(B (1.9.1 e$B$O$=$N$^$^e(B)  
|2. e$B$3$N5sF0$Oe(B 1.9 e$B$+$i$N;EMMJQ99e(B (1.9.1 e$B$K$b%P%C%/%]!\<%H$9$ke(B)  
|3. e$B$3$N5sF0$Oe(B 1.8/1.9 e$B$N;EMMe(B (1.8.x e$B$K$b%P%C%/%]!\<%H$9$ke(B)  
|  
|e$B$N$I$l$H$9$Y$-$G$7$g$&$+!#e(Brubyspec e$B$N=$@50MMj$NFbMF$K1F6A$7$^$9!#e(B

1e$B$^$?$Oe(B2e$B$G$7$g$&$M!#$I$A$i$K$9$k$+$Oe(BYuguie$B$5$s$K$\*G$$;$7$^$9!#e(B

---

<div class="post-metadata">

**Author:** ![Yusuke\_E](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f08c70/32.png) [@Yusuke\_E](https://www.ruby-forum.com/u/Yusuke_E)\
**Post date:** [January 30, 2010, 5:58am UTC](https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308/5 "2010-01-30T05:58:13Z")

</div>

On 1/27/10 6:29 PM, Yukihiro M. wrote:

> |挙動は現状のままにするとして、  
> |  
> |1. この挙動は 1.9.2 からの仕様変更 (1.9.1 はそのまま)  
> |2. この挙動は 1.9 からの仕様変更 (1.9.1 にもバックポートする)  
> |3. この挙動は 1.8/1.9 の仕様 (1.8.x にもバックポートする)  
> |  
> |のどれとすべきでしょうか。rubyspec ã®ä¿®æ­£ä¾é ¼ã®å†…å®¹ã«å½±éŸ¿ã—ã¾ã™ã€‚
> 
> 1または2でしょうね。どちらにするかはYuguiさんにお任せします。

1にします。そしてrubyspecを添付のpatchのように変更することを提案します。  
理由としては

- 1.8や1.9.1の挙動を今更意味なく変えるのは反対です。
- 1.9.2のポリシーは、それはそれで肯けるので、ならば挙動は維持してrdocを  
合わせましょう。
- inspectが何を表示するかは実装依存であるべきです。rb\_any\_to\_s、つまり  
デフォルトのto\_sとも独立であるべきです。
  - 当該のspecはrb\_any\_to\_sとinspectを混同しています。

---

<div class="post-metadata">

**Author:** ![Yusuke\_E](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f08c70/32.png) [@Yusuke\_E](https://www.ruby-forum.com/u/Yusuke_E)\
**Post date:** [January 30, 2010, 12:37pm UTC](https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308/6 "2010-01-30T12:37:17Z")

</div>

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

2010e$BG/e(B1e$B7ne(B30e$BF|e(B13:52 Yugui (Yuki S.)  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> 1e$B$K$7$^$9!#$=$7$Fe(Brubyspece$B$rE:IU$Ne(Bpatche$B$N$h$&$KJQ99$9$k$3$H$rDs0F$7$^$9!#e(B

e$B$"$j$,$H$&$4$6$$$^$9!#$=$7$Fe(B patch e$B$K;?@.$7$^$9!#e(B

> e$BM}M3$H$7$F$Oe(B
> 
> - 1.8e$B$de(B1.9.1e$B$N5sF0$r:#990UL#$J$/JQ$($k$N$OH?BP$G$9!#e(B
> - 1.9.2e$B$N%]%j%7!\<$O!“$=$l$O$=$l$G9N$1$k$N$G!”$J$i$P5sF0$O0];}$7$Fe(Brdoce$B$re(B  
> e$B9g$o$;$^$7$g$&!#e(B

1.9.2 e$B$+$i$N;EMMJQ99$H$$$&$N$KB?\>/Dq93$O$"$j$^$9$,!"N;2r$G$9!#e(B

> - inspecte$B$,2?$rI=\<($9$k$+$O\<BAu0MB8$G$“$k$Y$-$G$9!#e(Brb\_any\_to\_se$B!”$D$^$je(B  
> e$B%G%U%)%k%H$Ne(Bto\_se$B$H$bFHN)$G$"$k$Y$-$G$9!#e(B
> - e$BEv3:$Ne(Bspece$B$Oe(Brb\_any\_to\_se$B$He(Binspecte$B$r:.F1$7$F$$$^$9!#e(B

e$B:.F1$H$$$&$+!“e(Brdoc e$B$rL5;k$7$Fe(B rb\_obj\_inspect  
e$B$N\<BAu$r$^$k$4$He(B spec e$B$Ke(B  
e$B$7$?$s$G$7$g$&$M!#e(B  
inspect e$B$O$[$+$K$b$=$3$i$8$e$&$Ge(B spec  
e$B$K$5$l$F$7$^$C$F$$$k$N$G!”$$$:$le(B  
e$BD\>$5$J$$$H!"$H;W$$$^$9!#e(B

human-readable representation e$B$H$$$&$N$O5!3#H=Dj$G$-$J$$$1$l$I!"e(B

- ASCII-8BIT e$B0J30$N%(%s%3!\<%G%#%s%0$G!"e(Bvalid\_encoding? e$B$,e(B  
true e$B$K$J$ke(B

e$B$/$i$$$O;EMM$K$7$F$b$$$$5$$,$9$k!#e(B

---

<div class="post-metadata">

**Author:** ![Yusuke\_E](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f08c70/32.png) [@Yusuke\_E](https://www.ruby-forum.com/u/Yusuke_E)\
**Post date:** [February 9, 2010, 1:44pm UTC](https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308/7 "2010-02-09T13:44:22Z")

</div>

Yugui e$B$5$se(B  
e$B1sF#$G$9!#e(B

2010e$BG/e(B1e$B7ne(B30e$BF|e(B20:36 Yusuke ENDOH [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> > > 1e$B$^$?$Oe(B2e$B$G$7$g$&$M!#$I$A$i$K$9$k$+$Oe(BYuguie$B$5$s$K$\*G$$;$7$^$9!#e(B
> > 
> > 1e$B$K$7$^$9!#$=$7$Fe(Brubyspece$B$rE:IU$Ne(Bpatche$B$N$h$&$KJQ99$9$k$3$H$rDs0F$7$^$9!#e(B
> 
> e$B$"$j$,$H$&$4$6$$$^$9!#$=$7$Fe(B patch e$B$K;?@.$7$^$9!#e(B

e$B$3$N%Q%C%A$re(B commit + push e$B$7$F$$$?$@$1$^$9$+!)e(B  
e$B$\*K;$7$$$h$&$J$i!"5v2D$5$($b$i$($l$P;d$,$d$C$F$b$$$$$G$9!#e(B

---

<div class="post-metadata">

**Author:** ![Yusuke\_E](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f08c70/32.png) [@Yusuke\_E](https://www.ruby-forum.com/u/Yusuke_E)\
**Post date:** [February 11, 2010, 1:54pm UTC](https://www.ruby-forum.com/t/bug-2658-rubyspec-ruby-character-strings-interpolates-the-return-value-of-object-inspect-withou/182308/8 "2010-02-11T13:54:47Z")

</div>

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

2010e$BG/e(B2e$B7ne(B9e$BF|e(B21:42 Yusuke ENDOH [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> e$B$3$N%Q%C%A$re(B commit + push e$B$7$F$$$?$@$1$^$9$+!)e(B  
> e$B$\*K;$7$$$h$&$J$i!"5v2D$5$($b$i$($l$P;d$,$d$C$F$b$$$$$G$9!#e(B

IRC e$B$G5v2D$7$F$$$?$@$$$?$N$G!"%3%\_%C%H$7$^$7$?!#e(B