AllPackages returns the package path of each Go package in any source directory of the specified build context (e.g.

ExpandPatterns returns the set of packages matched by patterns, which may have the following forms: golang.org/x/tools/cmd/guru # a single package golang.org/x/tools/..

ForEachPackage calls the found function with the package path of each Go package it finds in any source directory of the specified build context (e.g.

import.