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

A parser for Go source files.

Package printer implements printing of AST nodes.

Package scanner implements a scanner for Go source text.

The sym package provides a way to iterate over and change the symbols in Go source files.

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

Types infers source locations and types from Go expressions.