Cyclic hash keys not supported in current Ruby 1.9.2dev

[ruby]

Cyclic hash keys not supported in current Ruby 1.9.2dev

[tenderlove]

Are you sure about this? I'm able to do cyclic hashes from dev:

[apatterson@nyctaefiebert psych (master)]$ ruby -v
ruby 1.9.2dev (2010-03-19 trunk 26977) [x86_64-darwin10.2.0]
[apatterson@nyctaefiebert psych (master)]$ irb
irb(main):001:0> x = {}=> {}
irb(main):002:0> x[x] = x=> {{...}=>{...}}
irb(main):003:0>

[tenderlove]

Just to make sure my irb wasn't wrong:

[apatterson@nyctaefiebert psych (master)]$ ruby -v
ruby 1.9.2dev (2010-03-19 trunk 26977) [x86_64-darwin10.2.0]
[apatterson@nyctaefiebert psych (master)]$ ruby -e'x = {}; x[x] = x; p x'
{{...}=>{...}}
[apatterson@nyctaefiebert psych (master)]$

[l15n]

lchin@Carthage $ ruby -v
ruby 1.9.2dev (2010-03-06 trunk 26827) [x86_64-darwin10.2.0]
lchin@Carthage $ ruby -e'x = {}; x[x] = x; p x'
-e:1:in `[]=': recursive key for hash (ArgumentError)
    from -e:1:in `<main>'

Didn't work at the time, but is now fixed in:

http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/hash.c?view=log#rev26961

Perhaps it helped that I chatted with nobu on twitter just before those commits.

http://togetter.com/li/10219

So it is no longer a problem.