| bytes | Package bytes implements functions for the manipulation of byte slices. |
| cmd/internal/bio | Package bio implements common I/O abstractions used within the Go toolchain. |
| cmd/internal/dwarf | Package dwarf generates DWARF debugging information. |
| cmd/internal/objabi | |
| cmd/internal/sys | |
| cmd/oldlink/internal/sym | |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| log | Package log implements a simple logging package. |
| sort | Package sort provides primitives for sorting slices and user-defined collections. |
| 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. |