| archive/zip | Package zip provides support for reading and writing ZIP archives. |
| bytes | Package bytes implements functions for the manipulation of byte slices. |
| cmd/go/internal/modconv | |
| cmd/go/internal/modfetch/bitbucket | |
| cmd/go/internal/modfetch/codehost | Package codehost defines the interface implemented by a code hosting source, along with support code for use by implementations. |
| cmd/go/internal/modfetch/github | |
| cmd/go/internal/modfetch/gitrepo | |
| cmd/go/internal/modfetch/googlesource | |
| cmd/go/internal/modfile | |
| cmd/go/internal/module | |
| cmd/go/internal/semver | |
| cmd/go/internal/web2 | |
| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| encoding/xml | Package xml implements a simple XML 1.0 parser that understands XML name spaces. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| io | Package io provides basic interfaces to I/O primitives. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| net/url | Package url parses URLs and implements query escaping. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| path | Package path implements utility routines for manipulating slash-separated paths. |
| path/filepath | Package filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths. |
| regexp | Package regexp implements regular expression search. |
| sort | Package sort provides primitives for sorting slices and user-defined collections. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| time | Package time provides functionality for measuring and displaying time. |