| errors | Package errors implements functions to manipulate errors. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| sync/atomic | Package atomic provides low-level atomic memory primitives useful for implementing synchronization algorithms. |
| syscall | Package syscall contains an interface to the low-level operating system primitives. |
| unicode/utf16 | Package utf16 implements encoding and decoding of UTF-16 sequences. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |