| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/exp/io/spi/driver | Package driver contains interfaces to be implemented by various SPI implementations. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| syscall | Package syscall contains an interface to the low-level operating system primitives. |
| time | Package time provides functionality for measuring and displaying time. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |