| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/rogpeppe/go-internal/imports | |
| github.com/rogpeppe/go-internal/testscript | Package testscript provides support for defining filesystem-based tests by creating scripts in a directory. |
| os/exec | Package exec runs external commands. |
| path/filepath | Package filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths. |
| runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |