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parse.y: reset current_arg after block var

• parse.y (block_param_def): reset current_arg after block
  parameter definition, not to warn references in that block body.
  [ruby-core:65990] [Bug #10314]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48190 b2dd03c8-39d4-4d8f-98ff-823fe69b080e