suppress warning: shadowing outer local variable - dir & opt

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57851 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/generic_erb.rb

@@ -39,7 +39,7 @@ end
 template = ARGV.shift or abort opt.to_s
 erb = ERB.new(File.read(template), nil, '%-')
 erb.filename = template
-result = source ? erb.src : erb.result
+result = source ? erb.src : proc{erb.result}.call
 if output
   if ifchange and (vpath.open(output, "rb") {|f| f.read} rescue nil) == result
     puts "#{output} #{unchanged}"