}
	return prev.(*ImportSpec).Comment == nil
}

type posSpan struct {
	Start token.Pos
	End   token.Pos
}

type cgPos struct {
	left bool // true if comment is to the left of the spec, false otherwise.
	cg   *CommentGroup
}

func sortSpecs(fset *token.FileSet, f *File, specs []Spec) []Spec {
	// Can't short-circuit here even if specs are already sorted,
	// since they might yet need deduplication.