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

		Value Expr
	}
)

// The direction of a channel type is indicated by a bit
// mask including one or both of the following constants.
type ChanDir int

const (
	SEND ChanDir = 1 << iota
	RECV
)

// A type is represented by a tree consisting of one
// or more of the following type-specific expression
// nodes.
type (
	// An ArrayType node represents an array or slice type.

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)

		}

		types.SkipSizeForTracing = true
		defer func() { types.SkipSizeForTracing = false }()
		fmt.Printf("%s: %s=> %p %s %v tc=%d type=%L\n", pos, indent, n, op, n, tc, typ)
	}
}

const (
	ctxStmt    = 1 << iota // evaluated at statement level
	ctxExpr                // evaluated in value context
	ctxType                // evaluated in type context
	ctxCallee              // call-only expressions are ok

	"strings"
	"sync"
	"unicode/utf8"
)

//go:generate stringer -type Kind

// Kind specifies the kind of value represented by a [Value].
type Kind int

const (
	// unknown values
	Unknown Kind = iota

	// non-numeric values
	Bool
	String

	// numeric values
	Int
	Float
	Complex
)

// A Value represents the value of a Go constant.
type Value interface {
	// Kind returns the value kind.

const (
	ctGrayscale      = 0
	ctTrueColor      = 2
	ctPaletted       = 3
	ctGrayscaleAlpha = 4
	ctTrueColorAlpha = 6
)

// A cb is a combination of color type and bit depth.
const (
	cbInvalid = iota
	cbG1
	cbG2
	cbG4
	cbG8
	cbGA8
	cbTC8
	cbP1
	cbP2
	cbP4
	cbP8
	cbTCA8
	cbG16
	cbGA16
	cbTC16
	cbTCA16
)

func cbPaletted(cb int) bool {
	return cbP1 <= cb && cb <= cbP8

// 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")