module T::Private::Methods::CallValidation

def self.create_validator_procedure_fast(mod, original_method, method_sig, original_visibility)
  # trampoline to reduce stack frame size
  arg_types = method_sig.arg_types
  case arg_types.length
  when 0
    create_validator_procedure_fast0(mod, original_method, method_sig, original_visibility)
  when 1
    create_validator_procedure_fast1(mod, original_method, method_sig, original_visibility,
                                  arg_types[0][1].raw_type)
  when 2
    create_validator_procedure_fast2(mod, original_method, method_sig, original_visibility,
                                  arg_types[0][1].raw_type,
                                  arg_types[1][1].raw_type)
  when 3
    create_validator_procedure_fast3(mod, original_method, method_sig, original_visibility,
                                  arg_types[0][1].raw_type,
                                  arg_types[1][1].raw_type,
                                  arg_types[2][1].raw_type)
  when 4
    create_validator_procedure_fast4(mod, original_method, method_sig, original_visibility,
                                  arg_types[0][1].raw_type,
                                  arg_types[1][1].raw_type,
                                  arg_types[2][1].raw_type,
                                  arg_types[3][1].raw_type)
  else
    raise 'should not happen'
  end
end