warning: (…) interpreted as grouped expression

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호.. ri_formatter.rb의 버그를 잡는데 도움을 준 듯.

#!/usr/local/bin/ruby -w 

# == Synopsis 
# Test synopsis 

require "optparse" 
require "rdoc/usage" 

opts = OptionParser.new 
opts.on("-h", "--help") { RDoc::usage } 
opts.parse(ARGV) rescue RDoc::usage('usage') 

puts "hello" 

실행 시 “/usr/local/lib/ruby/1.8/rdoc/ri/ri_formatter.rb:46: warning: (…) interpreted as grouped expression 란 에러가 나오는 이유는 ri_formatter.rb 의 버그라고 Matz 씨가 그러는군요.

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