# \[Bug #2776\] can't return from lambda with outer block

**URL:** <https://www.ruby-forum.com/t/bug-2776-cant-return-from-lambda-with-outer-block/183859>\
**Category:** Development\
**Created:** [February 21, 2010, 11:44pm UTC](https://www.ruby-forum.com/t/bug-2776-cant-return-from-lambda-with-outer-block/183859 "2010-02-21T23:44:17Z")\
**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:** [February 21, 2010, 11:44pm UTC](https://www.ruby-forum.com/t/bug-2776-cant-return-from-lambda-with-outer-block/183859/1 "2010-02-21T23:44:17Z")

</div>

Bug #2776: can’t return from lambda with outer block  
[http://redmine.ruby-lang.org/issues/show/2776](http://redmine.ruby-lang.org/issues/show/2776)

e$B5/I\<\<Te(B: \_ wanabe  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Low  
e$BC4Ev\<Te(B: Koichi Sasada, e$B%+%F%4%je(B: core, Target version: 1.9.x  
ruby -v: ruby 1.9.2dev (2010-02-21 trunk 26722) [i686-linux]

[http://pc12.2ch.net/test/read.cgi/tech/1264635554/685](http://pc12.2ch.net/test/read.cgi/tech/1264635554/685)  
e$B$G\<ALd$5$l$F$$$?$N$G$9$,e(B  
1.8 e$B$He(B 1.9 e$B$Ge(B lambda e$B$N5sF0$,0[$J$C$F$$$^$9!#e(B

* * *

# test.rb

## class Foo def initialize(&func) @func = lambda(&func) end def bar(x) @func.call(x) end end foo = Foo.new{ |x| return x\*\*2 } p foo.bar(2)

$ ruby1.8 -v test.rb  
ruby 1.8.7 (2009-06-12 patchlevel 174) [i486-linux]  
4

$ ./ruby -v test.rb  
ruby 1.9.2dev (2010-02-21 trunk 26722) [i686-linux]  
test.rb:9:in `block in <main>': unexpected return (LocalJumpError) from test.rb:6:in `call’  
from test.rb:6:in `bar' from test.rb:10:in `’

---

<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:** [February 22, 2010, 5:14am UTC](https://www.ruby-forum.com/t/bug-2776-cant-return-from-lambda-with-outer-block/183859/2 "2010-02-22T05:14:22Z")

</div>

e$B%A%1%C%He(B #2776 e$B$,99?7$5$l$^$7$?!#e(B (by Shyouhei U.)

e$BC4Ev\<Te(B Koichi Sasadae$B$+$ie(BYukihiro M.e$B$KJQ99e(B

e$B0[$J$C$F$$$k$N$O;v\<B$G$9$,!“$I$A$i$,@5$7$$$+e(B(e$B$”$k$$$ON\>J}4V0c$$e(B)e$B$O5DO@$NM\>CO$,$"$j$=$&$G$9!#e(B

# lambda(&proc)

## e$B$Ge(Bproce$B$re(Blambdae$B$KJQ49$G$-$k$+$I$&$+$N0c$$e(B?

[http://redmine.ruby-lang.org/issues/show/2776](http://redmine.ruby-lang.org/issues/show/2776)

---

<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:** [February 22, 2010, 6:38am UTC](https://www.ruby-forum.com/t/bug-2776-cant-return-from-lambda-with-outer-block/183859/3 "2010-02-22T06:38:37Z")

</div>

e$B$J$+$@$G$9!#e(B

At Mon, 22 Feb 2010 13:13:47 +0900,  
Shyouhei U. wrote in [ruby-dev:40454]:

> e$B0[$J$C$F$$$k$N$O;v\<B$G$9$,!"$I$A$i$,@5$7$$$+e(B(e$B$"$k$$$ON\>J}4V0c$$e(B)e$B$O5DO@$NM\>CO$,$"$j$=$&$G$9!#e(B
> 
> # lambda(&proc) e$B$Ge(Bproce$B$re(Blambdae$B$KJQ49$G$-$k$+$I$&$+$N0c$$e(B?

e$B$=$&$$$&$3$H$G$9$M!#e(B1.9e$B$re(B1.8e$B$K9g$o$;$k$J$i$3$s$J46$8!#e(B

# Index: proc.c

— proc.c (revision 26728)  
+++ proc.c (working copy)  
@@ -401,12 +401,15 @@ proc\_new(VALUE klass, int is\_lambda)

```
 if (procval) {

```

- rb\_proc\_t \*proc;  
if (RBASIC(procval)-\>klass == klass) {

- 

```
 return procval;

```

- }
- else {
- 

```
 VALUE newprocval = proc_dup(procval);

```

- 

```
 RBASIC(newprocval)->klass = klass;

```

- 

```
 return newprocval;

```

- 

```
 GetProcPtr(procval, proc);

```

- 

```
 if ((proc->is_lambda != 0) == (is_lambda != 0))

```

- return procval;  
}
- procval = proc\_dup(procval);
- RBASIC(procval)-\>klass = klass;
- GetProcPtr(procval, proc);
- proc-\>is\_lambda = is\_lambda ? TRUE : FALSE;
- return procval;  
}

---

<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:** [February 22, 2010, 7:02am UTC](https://www.ruby-forum.com/t/bug-2776-cant-return-from-lambda-with-outer-block/183859/4 "2010-02-22T07:02:02Z")

</div>

2010e$BG/e(B2e$B7ne(B22e$BF|e(B14:37 Nobuyoshi N.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> > # lambda(&proc) e$B$Ge(Bproce$B$re(Blambdae$B$KJQ49$G$-$k$+$I$&$+$N0c$$e(B?
> 
> e$B$=$&$$$&$3$H$G$9$M!#e(B1.9e$B$re(B1.8e$B$K9g$o$;$k$J$i$3$s$J46$8!#e(B

Proc#lambda? e$B$N%I%-%e%a%s%H$K=q$$$F$"$j$^$9$,!"e(B  
1.9 e$B$G$O!"e(BProc e$B%\*%V%8%'%/%H$,e(B lambda  
e$B$+$I$&$+$H$$$&@-\<A$Oe(B  
e$B$J$k$Y$/JQ$($J$$$H$$$&%G%6%$%s$K$J$C$F$$$^$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:** [February 22, 2010, 11:31am UTC](https://www.ruby-forum.com/t/bug-2776-cant-return-from-lambda-with-outer-block/183859/5 "2010-02-22T11:31:52Z")

</div>

e$B$J$+$@$G$9!#e(B

At Mon, 22 Feb 2010 15:00:34 +0900,  
Tanaka A. wrote in [ruby-dev:40456]:

> Proc#lambda? e$B$N%I%-%e%a%s%H$K=q$$$F$"$j$^$9$,!"e(B  
> 1.9 e$B$G$O!"e(BProc e$B%\*%V%8%’%/%H$,e(B lambda e$B$+$I$&$+$H$$$&@-\<A$Oe(B  
> e$B$J$k$Y$/JQ$($J$$$H$$$&%G%6%$%s$K$J$C$F$$$^$9!#e(B

e$B$J$s$G$=$&JQ$o$C$?$s$G$7$?$C$1e(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:** [February 22, 2010, 1:45pm UTC](https://www.ruby-forum.com/t/bug-2776-cant-return-from-lambda-with-outer-block/183859/6 "2010-02-22T13:45:19Z")

</div>

2010e$BG/e(B2e$B7ne(B22e$BF|e(B19:29 Nobuyoshi N.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> e$B$J$s$G$=$&JQ$o$C$?$s$G$7$?$C$1e(B?

return  
e$B$G$I$3$rH4$1$k$+$,JQ2=$9$k$N$C$F!"$U$D$&:$$k$s$8$c$J$$$G$9$+$M$'!#e(B

e$B$G$be(B 1.9 e$B$Ge(B

% ./ruby -ve ’  
def m(&b)  
p yield  
2  
end  
def n  
l = lambda { return 1 }  
m(&l)  
end  
p n  
’  
ruby 1.9.2dev (2010-02-22 trunk 26728) [i686-linux]  
1

e$B$OJQ$o$C$FJQ$@$J$!!#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:** [March 1, 2010, 3:11pm UTC](https://www.ruby-forum.com/t/bug-2776-cant-return-from-lambda-with-outer-block/183859/7 "2010-03-01T15:11:14Z")

</div>

e$B%A%1%C%He(B #2776 e$B$,99?7$5$l$^$7$?!#e(B (by \_ wanabe)

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

## e$B;EMM$G$“$k$h$&$G$9$N$Ge(B Reject e$B$5$;$F$$$?$@$-$^$9!#e(B e$B65$($F$$$?$@$$$F$”$j$,$H$&$4$6$$$^$7$?!#e(B

[http://redmine.ruby-lang.org/issues/show/2776](http://redmine.ruby-lang.org/issues/show/2776)