if err2 != nil {
			t.Fatal(err2)
		}

		id, err = ReadFile(tmp)
		if id != newID || err != nil {
			t.Errorf("ReadFile(%s after Rewrite) = %q, %v, want %q, nil", f, id, err, newID)
		}

		// Test an ELF PT_NOTE segment with an Align field of 0.
		// Do this by rewriting the file data.
		if strings.Contains(name, "elf") {
			// We only expect a 64-bit ELF file.
			if elf.Class(data[elf.EI_CLASS]) != elf.ELFCLASS64 {
				continue

				return desc, nil
			}
		}
	}
	return nil, nil
}

var elfGoNote = []byte("Go\x00\x00")
var elfGNUNote = []byte("GNU\x00")

// The Go build ID is stored in a note described by an ELF PT_NOTE prog
// header. The caller has already opened filename, to get f, and read
// at least 4 kB out, in data.
func readELF(name string, f *os.File, data []byte) (buildid string, err error) {

		{0xcf, 0xfa, 0xed, 0xfe},
	}
)

var readSize = 32 * 1024 // changed for testing

// readBinary reads the build ID from a binary.
//
// ELF binaries store the build ID in a proper PT_NOTE section.
//
// Other binary formats are not so flexible. For those, the linker
// stores the build ID as non-instruction bytes at the very beginning
// of the text segment, which should appear near the beginning