Imports of package cha

PathSynopsis
go/typesPackage types declares the data types and implements the algorithms for type-checking of Go packages.
golang.org/x/tools/go/types/typeutilPackage typeutil defines various utilities for types, such as Map, a hash table that maps types.Type to any value.
honnef.co/go/tools/callgraph
honnef.co/go/tools/ssa
honnef.co/go/tools/ssa/ssautil