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parse.y: warn static content assign in cond

• parse.y (assign_in_cond): warn for static content object asignments
  in conditional statements. [ruby-dev:43083] [Feature #4299]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37344 b2dd03c8-39d4-4d8f-98ff-823fe69b080e