# File lib/backports/tools/arguments.rb, line 6
  def self.coerce_to(obj, cls, meth)
    return obj if obj.kind_of?(cls)

    begin
      ret = obj.__send__(meth)
    rescue Exception => e
      raise TypeError, "Coercion error: #{obj.inspect}.#{meth} => #{cls} failed:\n" \
                       "(#{e.message})"
    end
    raise TypeError, "Coercion error: obj.#{meth} did NOT return a #{cls} (was #{ret.class})" unless ret.kind_of? cls
    ret
  end