Package bufio implements buffered I/O.

Package builtin provides documentation for Go's predeclared identifiers.

Package context defines the Context type, which carries deadlines, cancelation signals, and other request-scoped values across API boundaries and between processes.

Package crypto collects common cryptographic constants.

Package encoding defines interfaces shared by other packages that convert data to and from byte-level and textual representations.

Package errors implements functions to manipulate errors.

Package expvar provides a standardized interface to public variables, such as operation counters in servers.

Package flag implements command-line flag parsing.

Package hash provides interfaces for hash functions.

Package html provides functions for escaping and unescaping HTML text.

Package image implements a basic 2-D image library.

Package io provides basic interfaces to I/O primitives.

Package log implements a simple logging package.

Package mime implements parts of the MIME spec.

Package path implements utility routines for manipulating slash-separated paths.

Package plugin implements loading and symbol resolution of Go plugins.

Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types.

Package regexp implements regular expression search.

Package sort provides primitives for sorting slices and user-defined collections.

Package time provides functionality for measuring and displaying time.

Package unicode provides data and functions to test some properties of Unicode code points.

Package unsafe contains operations that step around the type safety of Go programs.