}
	return nil
}

func (f *WorkFile) SortBlocks() {
	f.removeDups() // otherwise sorting is unsafe

	for _, stmt := range f.Syntax.Stmt {
		block, ok := stmt.(*LineBlock)
		if !ok {
			continue
		}
		sort.SliceStable(block.Line, func(i, j int) bool {
			return lineLess(block.Line[i], block.Line[j])
		})
	}
}

// removeDups removes duplicate replace directives.
//