| errors | Package errors implements functions to manipulate errors. |
| golang.org/x/text/internal/language/compact | Package compact defines a compact representation of language tags. |
| golang.org/x/text/internal/stringset | Package stringset provides a way to represent a collection of strings compactly. |
| golang.org/x/text/language | Package language implements BCP 47 language tags and related functionality. |
| math | Package math provides basic constants and mathematical functions. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| unicode/utf8 | Package utf8 implements functions and constants to support text encoded in UTF-8. |