type UtilFlags int

const (
	// UtilSTW means utilization should account for STW events.
	// This includes non-GC STW events, which are typically user-requested.
	UtilSTW UtilFlags = 1 << iota
	// UtilBackground means utilization should account for
	// background mark workers.
	UtilBackground
	// UtilAssist means utilization should account for mark
	// assists.
	UtilAssist

type unifyMode uint

const (
	// If assign is set, we are unifying types involved in an assignment:
	// they may match inexactly at the top, but element types must match
	// exactly.
	assign unifyMode = 1 << iota

	// If exact is set, types unify if they are identical (or can be
	// made identical with suitable arguments for type parameters).
	// Otherwise, a named type and a type literal unify if their

package scanner

import (
	"go/token"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
)

var fset = token.NewFileSet()

const /* class */ (
	special = iota
	literal
	operator
	keyword
)

func tokenclass(tok token.Token) int {
	switch {
	case tok.IsLiteral():
		return literal
	case tok.IsOperator():
		return operator
	case tok.IsKeyword():

type color uint32

// An object may be painted in one of three colors.
// Color values other than white or black are considered grey.
const (
	white color = iota
	black
	grey // must be > white and black
)

func (c color) String() string {
	switch c {
	case white:
		return "white"
	case black:
		return "black"
	default:
		return "grey"
	}

			notewakeup(&b.wait)
		}
		break
	}
}

// profBufReadMode specifies whether to block when no data is available to read.
type profBufReadMode int

const (
	profBufBlocking profBufReadMode = iota
	profBufNonBlocking
)

var overflowTag [1]unsafe.Pointer // always nil

func (b *profBuf) read(mode profBufReadMode) (data []uint64, tags []unsafe.Pointer, eof bool) {
	if b == nil {
		return nil, nil, true

	if s.releasetime != 0 {
		s.releasetime = cputicks()
	}
	goready(s.g, traceskip)
}

type semaProfileFlags int

const (
	semaBlockProfile semaProfileFlags = 1 << iota
	semaMutexProfile
)

// Called from runtime.
func semacquire(addr *uint32) {
	semacquire1(addr, false, 0, 0, waitReasonSemacquire)
}

// Mode values control the operation of [New] and [NewFromFiles].
type Mode int

const (
	// AllDecls says to extract documentation for all package-level
	// declarations, not just exported ones.
	AllDecls Mode = 1 << iota

	// AllMethods says to show all embedded methods, not just the ones of
	// invisible (unexported) anonymous fields.
	AllMethods

	// PreserveAST says to leave the AST unmodified. Originally, pieces of

	refs    map[string]string
	refsErr error

	localTagsOnce sync.Once
	localTags     sync.Map // map[string]bool
}

const (
	// How much have we fetched into the git repo (in this process)?
	fetchNone = iota // nothing yet
	fetchSome        // shallow fetches of individual hashes
	fetchAll         // "fetch -t origin": get all remote branches and tags
)

// loadLocalTags loads tag references from the local git cache

	onceReadImports sync.Once
	savedImports    []rawImport // saved imports so that they're only read once
}

// Offsets for fields in the sourceFile.
const (
	sourceFileError = 4 * iota
	sourceFileParseError
	sourceFileSynopsis
	sourceFileName
	sourceFilePkgName
	sourceFileIgnoreFile
	sourceFileBinaryOnly
	sourceFileCgoDirectives
	sourceFileGoBuildConstraint

// offsets to one of the Class*Ptr classes, even though these classes
// were only defined in DWARF 3.
type Class int

const (
	// ClassUnknown represents values of unknown DWARF class.
	ClassUnknown Class = iota

	// ClassAddress represents values of type uint64 that are
	// addresses on the target machine.
	ClassAddress

	// ClassBlock represents values of type []byte whose
	// interpretation depends on the attribute.