| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| go/ast | Package ast declares the types used to represent syntax trees for Go packages. |
| go/build/constraint | Package constraint implements parsing and evaluation of build constraint lines. |
| go/constant | Package constant implements Values representing untyped Go constants and their corresponding operations. |
| golang.org/x/tools/go/analysis | Package analysis defines the interface between a modular static analysis and an analysis driver program. |
| golang.org/x/tools/go/analysis/passes/inspect | Package inspect defines an Analyzer that provides an AST inspector (golang.org/x/tools/go/ast/inspector.Inspector) for the syntax trees of a package. |
| honnef.co/go/tools/analysis/code | Package code answers structural and type questions about Go code. |
| honnef.co/go/tools/analysis/lint | Package lint provides abstractions on top of go/analysis. |
| honnef.co/go/tools/analysis/report | |
| honnef.co/go/tools/knowledge | Package knowledge contains manually collected information about Go APIs. |
| honnef.co/go/tools/pattern | Package pattern implements a simple language for pattern matching Go ASTs. |