| errors | Package errors implements functions to manipulate errors. |
| internal/oserror | Package oserror defines errors values used in the os package. |
| internal/runtime/syscall/windows | |
| internal/syscall/windows/sysdll | Package sysdll is an internal leaf package that records and reports which Windows DLL names are used by Go itself. |
| runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. |
| structs | Package structs defines marker types that can be used as struct fields to modify the properties of a struct. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| syscall | Package syscall contains an interface to the low-level operating system primitives. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |