func newSig(params, results []*types.Field) *types.Type {
	return types.NewSignature(nil, params, results)
}

func params(tlist ...*types.Type) []*types.Field {
	flist := make([]*types.Field, len(tlist))
	for i, typ := range tlist {
		flist[i] = types.NewField(src.NoXPos, nil, typ)
	}
	return flist
}

var runtimeDecls = [...]struct {
	name string
	tag  int
	typ  int
}{
	{"newobject", funcTag, 4},

	// Using cheapExpr also makes sure that the evaluation
	// of all arguments (and especially any panics) happen
	// before we begin to modify the slice in a visible way.
	ls := n.Args[1:]
	for i, n := range ls {
		n = cheapExpr(n, init)
		if !types.Identical(n.Type(), nsrc.Type().Elem()) {
			n = typecheck.AssignConv(n, nsrc.Type().Elem(), "append")
			n = walkExpr(n, init)
		}
		ls[i] = n
	}