for i := range ret {
		ret[i] = embed{r.string(), r.tokpos()}
	}
	return ret
}

func (sf *sourceFile) directives() []build.Directive {
	directivesOffset := sf.directivesOffset()
	r := sf.d.readAt(directivesOffset)
	numDirectives := r.int()
	ret := make([]build.Directive, numDirectives)
	for i := range ret {
		ret[i] = build.Directive{Text: r.string(), Pos: r.tokpos()}
	}
	return ret