# Fibers and IronRuby

**URL:** <https://www.ruby-forum.com/t/fibers-and-ironruby/208227>\
**Category:** IronRuby\
**Created:** [June 12, 2011, 9:04pm UTC](https://www.ruby-forum.com/t/fibers-and-ironruby/208227 "2011-06-12T21:04:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![luislavena](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/0ea827/32.png) [@luislavena](https://www.ruby-forum.com/u/luislavena)\
**Post date:** [June 12, 2011, 9:04pm UTC](https://www.ruby-forum.com/t/fibers-and-ironruby/208227/1 "2011-06-12T21:04:15Z")

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Hi all,

I was trying to test fibers under IronRuby but gives me this error:

> > > a = Fiber.new{sleep 3;puts “finished”}  
> > > (ir):1:in `const\_missing’: uninitialized constant Object::Fiber  
> > > (NameError)  
> > > from (ir):1

I am doing something wrong?

Are fibers supported in this version?

Regards,

Eduardo B.

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**Author:** ![michbukana](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/4af34b/32.png) [@michbukana](https://www.ruby-forum.com/u/michbukana)\
**Post date:** [June 15, 2011, 3:25pm UTC](https://www.ruby-forum.com/t/fibers-and-ironruby/208227/2 "2011-06-15T15:25:51Z")

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Hi all,

I am using IronRuby 1.1.2 and 1.1.3

Any inside on this?

Thank you

Eduardo