n := sf.d.intAt(pos)
	// each embed is 5 uint32s (string + tokpos)
	return pos + 4 + n*(4*5)
}

func (sf *sourceFile) imports() []rawImport {
	sf.onceReadImports.Do(func() {
		importsOffset := sf.importsOffset()
		r := sf.d.readAt(importsOffset)
		numImports := r.int()
		ret := make([]rawImport, numImports)
		for i := 0; i < numImports; i++ {
			ret[i] = rawImport{r.string(), r.tokpos()}
		}
		sf.savedImports = ret
	})