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

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"
	}

	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)
}

	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

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

}

// condResult is the result of an HTTP request precondition check.
// See https://tools.ietf.org/html/rfc7232 section 3.
type condResult int

const (
	condNone condResult = iota
	condTrue
	condFalse
)

func checkIfMatch(w ResponseWriter, r *Request) condResult {
	im := r.Header.Get("If-Match")
	if im == "" {
		return condNone
	}
	for {
		im = textproto.TrimString(im)

		return ""
	}
	return string(js)
}

// BuildMode specifies the build mode:
// are we just building things or also installing the results?
type BuildMode int

const (
	ModeBuild BuildMode = iota
	ModeInstall
	ModeBuggyInstall

	ModeVetOnly = 1 << 8
)

// NewBuilder returns a new Builder ready for use.
//
// If workDir is the empty string, NewBuilder creates a WorkDir if needed

func (d *dotReader) Read(b []byte) (n int, err error) {
	// Run data through a simple state machine to
	// elide leading dots, rewrite trailing \r\n into \n,
	// and detect ending .\r\n line.
	const (
		stateBeginLine = iota // beginning of line; initial state; must be zero
		stateDot              // read . at beginning of line
		stateDotCR            // read .\r at beginning of line
		stateCR               // read \r (possibly at end of line)

// The MergeMode flags control the behavior of [MergePackageFiles].
type MergeMode uint

const (
	// If set, duplicate function declarations are excluded.
	FilterFuncDuplicates MergeMode = 1 << iota
	// If set, comments that are not associated with a specific
	// AST node (as Doc or Comment) are excluded.
	FilterUnassociatedComments
	// If set, duplicate import declarations are excluded.
	FilterImportDuplicates

// some protection against cross-site request forgery attacks.
//
// See https://tools.ietf.org/html/draft-ietf-httpbis-cookie-same-site-00 for details.
type SameSite int

const (
	SameSiteDefaultMode SameSite = iota + 1
	SameSiteLaxMode
	SameSiteStrictMode
	SameSiteNoneMode
)

var (
	errBlankCookie           = errors.New("http: blank cookie")
	errEqualNotFoundInCookie = errors.New("http: '=' not found in cookie")