type target struct {
	sig  *Signature
	desc string
}

// newTarget creates a new target for the given type and description.
// The result is nil if typ is not a signature.
func newTarget(typ Type, desc string) *target {
	if typ != nil {
		if sig, _ := under(typ).(*Signature); sig != nil {
			return &target{sig, desc}
		}
	}
	return nil
}

		// in Identical() or String().
		sig, _ := sel.Type().(*Signature)
		if sel.Kind() == MethodVal {
			got := sig.Recv().Type()
			want := sel.Recv()
			if !Identical(got, want) {
				t.Errorf("%s: Recv() = %s, want %s", syntax, got, want)
			}
		} else if sig != nil && sig.Recv() != nil {
			t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
		}
	}

// certificate signing key.
type ConstraintViolationError struct{}

func (ConstraintViolationError) Error() string {
	return "x509: invalid signature: parent certificate cannot sign this kind of certificate"
}

func (c *Certificate) Equal(other *Certificate) bool {
	if c == nil || other == nil {
		return c == other
	}
	return bytes.Equal(c.Raw, other.Raw)
}

	}
	return *getSidSubAuthority(sid, idx)
}

// IsValid returns whether the SID has a valid revision and length.
func (sid *SID) IsValid() bool {
	return isValidSid(sid)
}

// Equals compares two SIDs for equality.
func (sid *SID) Equals(sid2 *SID) bool {
	return EqualSid(sid, sid2)
}

// IsWellKnown determines whether the SID matches the well-known sidType.

			positive, _, num, denom, suffix, err := parseQuantityString(item.input)
			if err != nil {
				t.Errorf("%v: unexpected error: %v", item.input, err)
				continue
			}
			if got.Sign() >= 0 && !positive || got.Sign() < 0 && positive {
				t.Errorf("%v: positive was incorrect: %t", item.input, positive)
				continue
			}
			var value string
			if !positive {
				value = "-"
			}
			value += num

	// heapAddrBits is the number of bits in a heap address. On
	// amd64, addresses are sign-extended beyond heapAddrBits. On
	// other arches, they are zero-extended.
	//
	// On most 64-bit platforms, we limit this to 48 bits based on a
	// combination of hardware and OS limitations.
	//
	// amd64 hardware limits addresses to 48 bits, sign-extended
	// to 64 bits. Addresses where the top 16 bits are not either

    # maximum performance should compile TF in their environment and can pass
    # `-march=native` there.
    # See https://github.com/tensorflow/tensorflow/issues/45744 and duplicates
    default_cc_opt_flags = '-Wno-sign-compare'
  question = ('Please specify optimization flags to use during compilation when'
              ' bazel option "--config=opt" is specified [Default is %s]: '
             ) % default_cc_opt_flags

			return w
		case u < uint64(Microsecond):
			// print nanoseconds
			prec = 0
			buf[w] = 'n'
		case u < uint64(Millisecond):
			// print microseconds
			prec = 3
			// U+00B5 'µ' micro sign == 0xC2 0xB5
			w-- // Need room for two bytes.
			copy(buf[w:], "µ")
		default:
			// print milliseconds
			prec = 6
			buf[w] = 'm'
		}
		w, u = fmtFrac(buf[:w], u, prec)
		w = fmtInt(buf[:w], u)

	}
	// We don't currently print out the discriminator, so we don't
	// save it.
	return a
}

// closureTypeName parses:
//
//	<closure-type-name> ::= Ul <lambda-sig> E [ <nonnegative number> ] _
//	<lambda-sig> ::= <parameter type>+
func (st *state) closureTypeName() AST {
	st.checkChar('U')
	st.checkChar('l')

	oldLambdaTemplateLevel := st.lambdaTemplateLevel

		}
	}
}

var parseDurationTests = []struct {
	in   string
	want Duration
}{
	// simple
	{"0", 0},
	{"5s", 5 * Second},
	{"30s", 30 * Second},
	{"1478s", 1478 * Second},
	// sign
	{"-5s", -5 * Second},
	{"+5s", 5 * Second},
	{"-0", 0},
	{"+0", 0},
	// decimal
	{"5.0s", 5 * Second},
	{"5.6s", 5*Second + 600*Millisecond},
	{"5.s", 5 * Second},
	{".5s", 500 * Millisecond},