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dyna_vars. no longer use frame.uniq.
* eval.c (proc_arity): arity is now defined as number of
parameters that would not be ignored. i.e. Proc.new{}.arity
returns zero. update test suites too.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5972 b2dd03c8-39d4-4d8f-98ff-823fe69b080e