Package ast declares the types used to represent syntax trees for Go packages.

Package bufio implements buffered I/O.

Package constant implements Values representing untyped Go constants and their corresponding operations.

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 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 parser implements a parser for Go source files.

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

Package printer implements printing of AST nodes.

Package regexp implements regular expression search.

Package scanner implements a scanner for Go source text.

Package time provides functionality for measuring and displaying time.

Package token defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates).

Package types declares the data types and implements the algorithms for type-checking of Go packages.

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.