OptionParser#on does not raise when klass and pat are given

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ArgumentError e$B$,H/@8$7$^$;$s!#e(B
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$ cat t.rb
require ‘optparse’
opts = OptionParser.new

opts.on(’-a A’, Array, /.{5}/){|v|
p v
}

opts.on(’-b A’, Array){|v|
p v
}

opts.parse(ARGV)

$ ruby-1.8 t.rb -a 1,2,3 -b 1,2,3
“1,2,3”
[“1”, “2”, “3”]

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