| 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. |
| 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/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 | |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |