bytes | Package bytes implements functions for the manipulation of byte slices. |
go/ast | Package ast declares the types used to represent syntax trees for Go packages. |
go/format | Package format implements standard formatting of Go source. |
go/token | Package token defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates). |
golang.org/x/tools/go/analysis | Package analysis defines the interface between a modular static analysis and an analysis driver program. |
honnef.co/go/tools/pattern | Package pattern implements a simple language for pattern matching Go ASTs. |