// Types don't generally have position information.
		// If we don't have a valid pos provided, try to use
		// one close enough.
		if !pos.IsValid() && len(ityp.methods) > 0 {
			pos = ityp.methods[0].pos
		}

		check.trace(pos, "-- type set for %s", ityp)
		check.indent++
		defer func() {
			check.indent--
			check.trace(pos, "=> %s ", ityp.typeSet())
		}()
	}

		// Types don't generally have position information.
		// If we don't have a valid pos provided, try to use
		// one close enough.
		if !pos.IsKnown() && len(ityp.methods) > 0 {
			pos = ityp.methods[0].pos
		}

		check.trace(pos, "-- type set for %s", ityp)
		check.indent++
		defer func() {
			check.indent--
			check.trace(pos, "=> %s ", ityp.typeSet())
		}()
	}

	prevLine   int64
	prevColumn int64
}

func (r *importReader) obj(name string) {
	tag := r.byte()
	pos := r.pos()

	switch tag {
	case 'A':
		typ := r.typ()

		r.declare(types.NewTypeName(pos, r.currPkg, name, typ))

	case 'C':
		typ, val := r.value()

		r.declare(types.NewConst(pos, r.currPkg, name, typ, val))

	case 'F', 'G':
		var tparams []*types.TypeParam
		if tag == 'G' {

}

// NewFunc returns a new Func with the given name and type.
//
// fpos is the position of the "func" token, and npos is the position
// of the name identifier.
//
// TODO(mdempsky): I suspect there's no need for separate fpos and
// npos.
func NewFunc(fpos, npos src.XPos, sym *types.Sym, typ *types.Type) *Func {
	name := NewNameAt(npos, sym, typ)
	name.Class = PFUNC
	sym.SetFunc(true)

	fn := &Func{Nname: name}

func (b *Block) NewValue0(pos src.XPos, op Op, t *types.Type) *Value {
	v := b.Func.newValue(op, t, b, pos)
	v.AuxInt = 0
	v.Args = v.argstorage[:0]
	return v
}

// NewValue0I returns a new value in the block with no arguments and an auxint value.
func (b *Block) NewValue0I(pos src.XPos, op Op, t *types.Type, auxint int64) *Value {
	v := b.Func.newValue(op, t, b, pos)
	v.AuxInt = auxint

//	-                   invalid position without file name
func (pos Position) String() string {
	s := pos.Filename
	if pos.IsValid() {
		if s != "" {
			s += ":"
		}
		s += strconv.Itoa(pos.Line)
		if pos.Column != 0 {
			s += fmt.Sprintf(":%d", pos.Column)
		}
	}
	if s == "" {
		s = "-"
	}
	return s
}

// Pos is a compact encoding of a source position within a file set.

	re(`-mcmodel=[0-9a-z-]+`),
	re(`-mfloat-abi=([^@\-].*)`),
	re(`-mfpmath=[0-9a-z,+]*`),
	re(`-m(no-)?avx[0-9a-z.]*`),
	re(`-m(no-)?ms-bitfields`),
	re(`-m(no-)?stack-(.+)`),
	re(`-mmacosx-(.+)`),
	re(`-mios-simulator-version-min=(.+)`),
	re(`-miphoneos-version-min=(.+)`),
	re(`-mlarge-data-threshold=[0-9]+`),
	re(`-mtvos-simulator-version-min=(.+)`),
	re(`-mtvos-version-min=(.+)`),

// 'pos' represents the position at which the identifiers may be inserted. 'pos' must be within
// the scope of each of identifier we select. Otherwise, we will insert a variable at 'pos' that
// is unrecognized.
func MatchingIdents(typs []types.Type, node ast.Node, pos token.Pos, info *types.Info, pkg *types.Package) map[types.Type][]string {

func (check *Checker) validateTArgLen(pos token.Pos, name string, want, got int) bool {
	var qual string
	switch {
	case got < want:
		qual = "not enough"
	case got > want:
		qual = "too many"
	default:
		return true
	}

	msg := check.sprintf("%s type arguments for type %s: have %d, want %d", qual, name, got, want)
	if check != nil {
		check.error(atPos(pos), WrongTypeArgCount, msg)
		return false
	}

// firstInSrc reports the index of the object with the "smallest"
// source position in path. path must not be empty.
func firstInSrc(path []Object) int {
	fst, pos := 0, path[0].Pos()
	for i, t := range path[1:] {
		if cmpPos(t.Pos(), pos) < 0 {
			fst, pos = i+1, t.Pos()
		}
	}
	return fst
}

func (check *Checker) constDecl(obj *Const, typ, init syntax.Expr, inherited bool) {
	assert(obj.typ == nil)