| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/text/internal/catmsg | Package catmsg contains support types for package x/text/message/catalog. |
| golang.org/x/text/internal/number | Package number contains tools and data for formatting numbers. |
| golang.org/x/text/language | Package language implements BCP 47 language tags and related functionality. |
| golang.org/x/text/message/catalog | Package catalog defines collections of translated format strings. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |