| bytes | Package bytes implements functions for the manipulation of byte slices. |
| cmd/go/internal/cfg | Package cfg holds configuration shared by multiple parts of the go command. |
| debug/elf | Package elf implements access to ELF object files. |
| debug/macho | Package macho implements access to Mach-O object files. |
| encoding/binary | Package binary implements simple translation between numbers and byte sequences and encoding and decoding of varints. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| io | Package io provides basic interfaces to I/O primitives. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |