| errors | Package errors implements functions to manipulate errors. |
| internal/syscall/windows/sysdll | Package sysdll is an internal leaf package that records and reports which Windows DLL names are used by Go itself. |
| io | Package io provides basic interfaces to I/O primitives. |
| 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. |