// previously supplied to NewCoverageDataWriter. Returns an error
// if something went wrong somewhere with the write.
func (cfw *CoverageDataWriter) Write(metaFileHash [16]byte, args map[string]string, visitor CounterVisitor) error {
	if err := cfw.writeHeader(metaFileHash); err != nil {
		return err
	}
	return cfw.AppendSegment(args, visitor)
}

//
// Deprecated: use the type checker [go/types] instead; see [Object].
type Scope struct {
	Outer   *Scope
	Objects map[string]*Object
}

// NewScope creates a new scope nested in the outer scope.
func NewScope(outer *Scope) *Scope {
	const n = 4 // initial scope capacity
	return &Scope{outer, make(map[string]*Object, n)}
}

// Lookup returns the object with the given name if it is

	err = checkMediaTypeDisposition(mediatype)
	if err != nil {
		return "", nil, err
	}

	params = make(map[string]string)

	// Map of base parameter name -> parameter name -> value
	// for parameters containing a '*' character.
	// Lazily initialized.
	var continuation map[string]map[string]string

	v = v[len(base):]
	for len(v) > 0 {
		v = strings.TrimLeftFunc(v, unicode.IsSpace)
		if len(v) == 0 {

// NOTE: Adapted from go/types/infer.go. If it is later exported, factor.
type Free struct {
	seen map[types.Type]bool
}

// Has reports whether the specified type has a free type parameter.
func (w *Free) Has(typ types.Type) (res bool) {

	// detect cycles
	if x, ok := w.seen[typ]; ok {
		return x
	}
	if w.seen == nil {
		w.seen = make(map[types.Type]bool)
	}
	w.seen[typ] = false
	defer func() {
		w.seen[typ] = res
	}()

	"errors"
	"fmt"
	"internal/buildcfg"
	"internal/platform"
	"internal/testenv"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"runtime/debug"
	"strings"
	"sync"
)

func scriptConditions() map[string]script.Cond {
	conds := scripttest.DefaultConds()

	add := func(name string, cond script.Cond) {
		if _, ok := conds[name]; ok {
			panic(fmt.Sprintf("condition %q is already registered", name))
		}

}

// FoldDup reports a pair of strings from the list that are
// equal according to strings.EqualFold.
// It returns "", "" if there are no such strings.
func FoldDup(list []string) (string, string) {
	clash := map[string]string{}
	for _, s := range list {
		fold := ToFold(s)
		if t := clash[fold]; t != "" {
			if s > t {
				s, t = t, s
			}
			return s, t
		}
		clash[fold] = s
	}
	return "", ""
}

// If exclude is not nil, keys where exclude[key] == true are not written.
// Keys are not canonicalized before checking the exclude map.
func (h Header) WriteSubset(w io.Writer, exclude map[string]bool) error {
	return h.writeSubset(w, exclude, nil)
}

func (h Header) writeSubset(w io.Writer, exclude map[string]bool, trace *httptrace.ClientTrace) error {
	ws, ok := w.(io.StringWriter)
	if !ok {
		ws = stringWriter{w}
	}

type block struct {
	parent *block                      // enclosing block
	lstmt  *ast.LabeledStmt            // labeled statement to which this block belongs, or nil
	labels map[string]*ast.LabeledStmt // allocated lazily
}

// insert records a new label declaration for the current block.
// The label must not have been declared before in any block.
func (b *block) insert(s *ast.LabeledStmt) {

	s.assignColors()
	return *s
}

func (s *StackSet) makeInitialStacks(rpt *Report) {
	type key struct {
		line    profile.Line
		inlined bool
	}
	srcs := map[key]int{} // Sources identified so far.
	seenFunctions := map[string]bool{}
	unknownIndex := 1
	getSrc := func(line profile.Line, inlined bool) int {
		k := key{line, inlined}
		if i, ok := srcs[k]; ok {
			return i
		}

	f()
	go f()
}

// Same, but function has a parameter and return value.
func _[T interface{ ~func(string) int }](f T) int {
	return f("hello")
}

// Map access of a generic type which has a map as core type.
func _[V any, T interface{ ~map[string]V }](p T) V {
	return p["test"]
}

// Testing partial and full type inference, including the case where the types can