fns = append(fns, func(t *testing.T) {
				list, err := Upgrade(m(kf[1]), reqs, ms(kf[2:])...)
				if err == nil {
					// Copy the reqs map, but substitute the upgraded requirements in
					// place of the target's original requirements.
					upReqs := make(reqsMap, len(reqs))
					for m, r := range reqs {
						upReqs[m] = r
					}
					upReqs[m(kf[1])] = list

					list, err = Req(m(kf[1]), nil, upReqs)
				}

// GoSyscallStart+GoSyscallEnd, unless we observe a GoSysBlock, in which case we
// emit a GoSyscallStart+GoSyscallEndBlocked pair with the correct duration
// (i.e. starting at the original GoSyscall).
//
// The resulting trace treats the old trace as a single, large generation,
// sharing a single evTable for all events.
//
// We use a new (compared to what was used for 'go tool trace' in earlier

//
// Given a value of one of Go's predeclared string, bool, or
// (non-complex) numeric types, AnyValue returns a Value of kind
// [KindString], [KindBool], [KindUint64], [KindInt64], or [KindFloat64].
// The width of the original numeric type is not preserved.
//
// Given a [time.Time] or [time.Duration] value, AnyValue returns a Value of kind
// [KindTime] or [KindDuration]. The monotonic time is not preserved.
//

	var echRetryConfigList []byte
	if hs.echContext != nil {
		confTranscript := cloneHash(hs.echContext.innerTranscript, hs.suite.hash)
		confTranscript.Write(hs.serverHello.original[:30])
		confTranscript.Write(make([]byte, 8))
		confTranscript.Write(hs.serverHello.original[38:])
		acceptConfirmation := hs.suite.expandLabel(
			hs.suite.extract(hs.echContext.innerHello.random, nil),
			"ech accept confirmation",
			confTranscript.Sum(nil),

// It is also valid to use &^ to round pointers, usually for alignment.
// In all cases, the result must continue to point into the original allocated object.
//
// Unlike in C, it is not valid to advance a pointer just beyond the end of
// its original allocation:
//
//	// INVALID: end points outside allocated space.
//	var s thing
//	end = unsafe.Pointer(uintptr(unsafe.Pointer(&s)) + unsafe.Sizeof(s))
//

// Methods attached to a *Named type are also instantiated, and associated with
// a new *Func that has the same position as the original method, but nil function
// scope.
//
// If ctxt is non-nil, it may be used to de-duplicate the instance against
// previous instances with the same identity. As a special case, generic
// *Signature origin types are only considered identical if they are pointer
// equivalent, so that instantiating distinct (but possibly identical)

	re := compileTest(t, test.pat, "")
	if re == nil {
		return
	}
	m1 := re.MatchString(test.text)
	m2 := re.Copy().MatchString(test.text)
	if m1 != m2 {
		t.Errorf("Copied Regexp match failure on %s: original gave %t; copy gave %t; should be %t",
			test, m1, m2, len(test.matches) > 0)
	}
}

func TestCopyMatch(t *testing.T) {
	for _, test := range findTests {
		copyMatchTest(t, &test)
	}
}

		// careful not to call any methods that would cause t to be expanded: doing
		// so would result in deadlock.
		//
		// So we call t.Origin().TypeParams() rather than t.TypeParams().
		orig := t.Origin()
		n := orig.TypeParams().Len()
		if n == 0 {
			return t // type is not parameterized
		}

		if t.TypeArgs().Len() != n {
			return Typ[Invalid] // error reported elsewhere

}

// An EnvVar is an environment variable Name=Value.
type EnvVar struct {
	Name    string
	Value   string
	Changed bool // effective Value differs from default
}

// OrigEnv is the original environment of the program at startup.
var OrigEnv []string

// CmdEnv is the new environment for running go tool commands.
// User binaries (during go test or go run) are run with OrigEnv,
// not CmdEnv.

	}

	// Read into buffer of that size.
	buf := make([]byte, n)
	if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
		return nil, err
	}

	// The actual call may return less than the original reported required
	// size so ensure we deal with that.
	return buf[:n], nil
}

func SysctlClockinfo(name string) (*Clockinfo, error) {
	mib, err := sysctlmib(name)
	if err != nil {
		return nil, err