}
	// T is not the empty interface (i.e., the type set of T is restricted)

	// An interface V with an empty type set satisfies any interface.
	// (The empty set is a subset of any set.)
	Vi, _ := Vu.(*Interface)
	if Vi != nil && Vi.typeSet().IsEmpty() {
		return true
	}
	// type set of V is not empty

	// No type with non-empty type set satisfies the empty type set.
	if Ti.typeSet().IsEmpty() {
		if cause != nil {

// API

// A _TypeSet represents the type set of an interface.
// Because of existing language restrictions, methods can be "factored out"
// from the terms. The actual type set is the intersection of the type set
// implied by the methods and the type set described by the terms and the
// comparable bit. To test whether a type is included in a type set
// ("implements" relation), the type must implement all methods _and_ be

	FlagRound         = flag.Int64("R", -1, "set address rounding `quantum`")
	FlagTextAddr      = flag.Int64("T", -1, "set the start address of text symbols")
	flagEntrySymbol   = flag.String("E", "", "set `entry` symbol name")
	flagPruneWeakMap  = flag.Bool("pruneweakmap", true, "prune weak mapinit refs")

	"math/rand"
	"sync"
	"sync/atomic"
)

// Work manages a set of work items to be executed in parallel, at most once each.
// The items in the set must all be valid map keys.
type Work[T comparable] struct {
	f       func(T) // function to run for each item
	running int     // total number of runners

	mu      sync.Mutex
	added   map[T]bool // items added to set
	todo    []T        // items yet to be run

type RunConfig struct {
	TelemetryDir string    // if set, overrides the telemetry data directory
	UploadURL    string    // if set, overrides the telemetry upload endpoint
	LogWriter    io.Writer // if set, used for detailed logging of the upload process
	Env          []string  // if set, appended to the config download environment
	StartTime    time.Time // if set, overrides the upload start time
}

	_, ok := Unalias(t).(*TypeParam)
	return ok
}

// hasEmptyTypeset reports whether t is a type parameter with an empty type set.
// The function does not force the computation of the type set and so is safe to
// use anywhere, but it may report a false negative if the type set has not been
// computed yet.
func hasEmptyTypeset(t Type) bool {
	if tpar, _ := Unalias(t).(*TypeParam); tpar != nil && tpar.bound != nil {

func (f *Func) SetDupok(b bool)                    { f.flags.set(funcDupok, b) }
func (f *Func) SetWrapper(b bool)                  { f.flags.set(funcWrapper, b) }
func (f *Func) SetABIWrapper(b bool)               { f.flags.set(funcABIWrapper, b) }
func (f *Func) SetNeedctxt(b bool)                 { f.flags.set(funcNeedctxt, b) }
func (f *Func) SetIsHiddenClosure(b bool)          { f.flags.set(funcIsHiddenClosure, b) }

For inbound requests, the new [Request.Pattern] field contains the [ServeMux]
pattern (if any) that matched the request. This field is not set when

[!GOOS:windows] env GOOS=windows
[GOARCH:amd64] env GOARCH=arm64
[!GOARCH:amd64] env GOARCH=amd64

go env -changed GOOS
[GOOS:windows] stdout 'set GOOS=linux'
[!GOOS:windows] stdout 'GOOS=''windows'''
go env -changed GOARCH
[GOARCH:amd64] stdout 'set GOARCH=arm64|GOARCH=''arm64'''
[!GOARCH:amd64] stdout 'set GOARCH=amd64|GOARCH=''amd64'''

go env -changed -json GOOS
[GOOS:windows] stdout '"GOOS": "linux"'
[!GOOS:windows] stdout '"GOOS": "windows"'

	// If enableCoreTypeUnification is set, unification will consider
	// the core types, if any, of non-local (unbound) type parameters.
	enableCoreTypeUnification = true

	// If traceInference is set, unification will print a trace of its operation.
	// Interpretation of trace:
	//   x ≡ y    attempt to unify types x and y
	//   p ➞ y    type parameter p is set to type y (p is inferred to be y)