I am not sure this qualifies as Gem Dep. Hell but here it goes:

irb(main):001:0> require 'dm-validations'
=> true
irb(main):002:0> require 'dm-core'
=> false

irb(main):001:0> require 'dm-core'
=> true
irb(main):002:0> require 'dm-validations'
Gem::Exception: can't activate dm-core (~> 0.9.9, runtime), already
activated dm-core-0.10.0

I have dm-core 0.10.0 and dm-validations 0.9.9 installed (the highest
version of each, I mean), so when I first require dm-validations it
will pull in dm-core 0.9.9 (also present on my system). The other way
around it fails because dm-core-0.10.0 is already loaded so when dm-
validations require dm-core-0.9.9: bang!

I am pretty sure this is how rubygems works and is unrelated to
DataMapper but isn't this the source of all evil?

Balint
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