# Enumerator raises \`dead fiber called'

**URL:** <https://www.ruby-forum.com/t/enumerator-raises-dead-fiber-called/122114>\
**Category:** Development\
**Created:** [December 4, 2007, 6:14pm UTC](https://www.ruby-forum.com/t/enumerator-raises-dead-fiber-called/122114 "2007-12-04T18:14:39Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [December 4, 2007, 6:14pm UTC](https://www.ruby-forum.com/t/enumerator-raises-dead-fiber-called/122114/1 "2007-12-04T18:14:39Z")

</div>

e$B1sF#$H?=$7$^$9!#e(B

e$B0J2\<$N%3!\<%I$Ge(B dead fiber called  
e$B$,H/@8$9$k$N$O;EMM$G$7$g$&$+!#e(B

def foo  
raise StopIteration  
end

g = to\_enum(:foo)  
g.next rescue p $! #=\> StopIteration  
g.next rescue p $! #=\> dead fiber called

e$B$^$?!"0J2\<$N$h$&$Ke(B Enumerator e$B$re(B dup  
e$B$9$k$HJQ$J;v$K$J$j$^$9!#e(B

def foo  
yield 1  
end

g1 = to\_enum(:foo)  
p g1.next #=\> 1  
g2 = g1.dup  
g1.next rescue p $! #=\> iteration reached at end

p g2.next #=\> #Fiber:0xb7d35cf4  
g2.next rescue p $! #=\> dead fiber called

Fiber e$B$,e(B dup e$B$G$-$J$$$N$G!"e(BEnumerator e$B$Ne(B dup  
e$B$b6X;\_$9$Y$-$G$Oe(B  
e$B$J$$$G$7$g$&$+!#$=$&$G$J$$$H$7$F$b!"e(Benumerator\_init\_copy e$B$Ge(B  
dst e$B$He(B no\_next e$B$N%3%T!\<$,O3$l$F$$$k$h$&$J5$$,$7$^$9!#e(B