# File lib/thor/task.rb, line 79 def handle_argument_error?(instance, error, caller) not_debugging?(instance) && error.message =~ /wrong number of arguments/ && begin saned = sans_backtrace(error.backtrace, caller) # Ruby 1.9 always include the called method in the backtrace saned.empty? || (saned.size == 1 && RUBY_VERSION >= "1.9") end end