type io.ReaderAt

5 uses

	io (current package)
		io.go#L230: type ReaderAt interface {
		io.go#L487: func NewSectionReader(r ReaderAt, off int64, n int64) *SectionReader {
		io.go#L503: 	r     ReaderAt

	embed
		embed.go#L354: 	_ io.ReaderAt = (*openFile)(nil)

	mime/multipart
		formdata.go#L289: 	io.ReaderAt