# New block parameter rule

**URL:** <https://www.ruby-forum.com/t/new-block-parameter-rule/106901>\
**Category:** Development\
**Created:** [June 15, 2007, 5:33am UTC](https://www.ruby-forum.com/t/new-block-parameter-rule/106901 "2007-06-15T05:33:26Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![SASADA\_Koichi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/f1d935/32.png) [@SASADA\_Koichi](https://www.ruby-forum.com/u/SASADA_Koichi)\
**Post date:** [June 15, 2007, 5:33am UTC](https://www.ruby-forum.com/t/new-block-parameter-rule/106901/1 "2007-06-15T05:33:26Z")

</div>

e$B!!$5$5$@$G$9!#e(B

e$B!!e(B|v| e$B$Oe(B |v,|  
e$B$N0UL#$H$7$F07$&$H$$$&$h$&$K!"%V%m%C%/%Q%i%a!\<%?e(B  
e$B$N%k!\<%k$rJQ99$7$^$7$?!#e(B

e$B!!$D$^$j!"e(Bdef m; yield 1, 2; end; m{|v| p v} e$B$Oe(B [1, 2]  
e$B$G$O$Je(B  
e$B$/!"e(B1 e$B$rI=\<($7$^$9!#e(B

> [http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/test/ruby/test\_iterator.rb?r1=12544&r2=12543](http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/test/ruby/test_iterator.rb?r1=12544&r2=12543)  
> [http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/test/ruby/test\_assignment.rb?r1=12544&r2=12543](http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/test/ruby/test_assignment.rb?r1=12544&r2=12543)  
> [http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/test/ruby/test\_yield.rb?r1=12544&r2=12543](http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/test/ruby/test_yield.rb?r1=12544&r2=12543)  
> [http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/test/ruby/test\_basicinstructions.rb?r1=12544&r2=12543](http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/test/ruby/test_basicinstructions.rb?r1=12544&r2=12543)

e$B!!$3$l$KH\<$$!"e(Btest  
e$B$r2~B$$7$^$7$?$,!“K\Ev$K$3$N2~JQ$,@5$7$$$+e(B  
e$B$I$&$+!”$R$H$D8+$F$$$?$@$1$J$$$G$7$g$&$+!#e(B

> ```
> def f; yield(*[[]]); end; f {|a,b,*c| assert_equal([[],nil,[]], [a,b,c])}; undef f
> 
> ```

e$B!!$3$l$J$s$+$O!“$?$V$se(B [nil, nil, []] e$B$@$m$&$H;W$C$FJQ99$7e(B  
e$B$A$c$C$?$s$G$9$,!”@5$7$+$C$?$G$9$+!)e(B

---

<div class="post-metadata">

**Author:** ![SASADA\_Koichi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/f1d935/32.png) [@SASADA\_Koichi](https://www.ruby-forum.com/u/SASADA_Koichi)\
**Post date:** [June 15, 2007, 5:53am UTC](https://www.ruby-forum.com/t/new-block-parameter-rule/106901/2 "2007-06-15T05:53:27Z")

</div>

In article [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid),  
SASADA Koichi [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

> e$B!!$3$l$KH\<$$!"e(Btest e$B$r2~B$$7$^$7$?$,!“K\Ev$K$3$N2~JQ$,@5$7$$$+e(B  
> e$B$I$&$+!”$R$H$D8+$F$$$?$@$1$J$$$G$7$g$&$+!#e(B

Hash#each e$B$Oe(B 2e$BMWAG$NG[Ns$r$R$H$D$NCM$H$7$Fe(B yield  
e$B$9$k$h$&$Ke(B  
e$B$9$k$H$$$&$N$,e(B [ruby-dev:29616] e$B$NDs0F$J$N$G!"e(BHash#each  
e$B$^$oe(B  
e$B$j$N%F%9%HJQ99$O;d$N0U?^$H$O0c$$$^$9!#e(B

> > ```
> > def f; yield(*[[]]); end; f {|a,b,*c| assert_equal([[],nil,[]], [a,b,c])}; undef f
> > 
> > ```
> 
> e$B!!$3$l$J$s$+$O!“$?$V$se(B [nil, nil, []] e$B$@$m$&$H;W$C$FJQ99$7e(B  
> e$B$A$c$C$?$s$G$9$,!”@5$7$+$C$?$G$9$+!)e(B

[ruby-dev:29616] e$B$G$b$=$&JQ$($F$"$j$^$9$h$M!#e(B

---

<div class="post-metadata">

**Author:** ![SASADA\_Koichi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/f1d935/32.png) [@SASADA\_Koichi](https://www.ruby-forum.com/u/SASADA_Koichi)\
**Post date:** [June 15, 2007, 6:28am UTC](https://www.ruby-forum.com/t/new-block-parameter-rule/106901/3 "2007-06-15T06:28:31Z")

</div>

e$B!!$5$5$@$G$9!#e(B

Tanaka A. wrote:

> Hash#each e$B$Oe(B 2e$BMWAG$NG[Ns$r$R$H$D$NCM$H$7$Fe(B yield e$B$9$k$h$&$Ke(B  
> e$B$9$k$H$$$&$N$,e(B [ruby-dev:29616] e$B$NDs0F$J$N$G!"e(BHash#each e$B$^$oe(B  
> e$B$j$N%F%9%HJQ99$O;d$N0U?^$H$O0c$$$^$9!#e(B

e$B!!e(Br12546 e$B$NJQ99$GBg\>fIW$G$9$+!#e(B

> > > ```
> > > def f; yield(*[[]]); end; f {|a,b,*c| assert_equal([[],nil,[]], [a,b,c])}; undef f
> > > 
> > > ```
> > 
> > e$B!!$3$l$J$s$+$O!"$?$V$se(B [nil, nil, []] e$B$@$m$&$H;W$C$FJQ99$7e(B  
> > e$B$A$c$C$?$s$G$9$,!"@5$7$+$C$?$G$9$+!)e(B
> 
> [ruby-dev:29616] e$B$G$b$=$&JQ$($F$"$j$^$9$h$M!#e(B

e$B!!$_$_!#$J$k$[$I!#e(B

---

<div class="post-metadata">

**Author:** ![SASADA\_Koichi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/f1d935/32.png) [@SASADA\_Koichi](https://www.ruby-forum.com/u/SASADA_Koichi)\
**Post date:** [June 15, 2007, 1:21pm UTC](https://www.ruby-forum.com/t/new-block-parameter-rule/106901/4 "2007-06-15T13:21:38Z")

</div>

In article [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid),  
SASADA Koichi [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

> e$B!!e(Br12546 e$B$NJQ99$GBg\>fIW$G$9$+!#e(B

test/ruby/test\_yield.rb e$B$Ge(B k e$B$re(B kv  
e$B$KLa$7K:$l$F$^$9$+$M!#e(B