The language has a tool that does this, and every editor I can think of uses it (https://github.com/golang/tools/tree/master/cmd/guru https://github.com/golang/

The language has a tool that does this, and every editor I can think of uses it (https://github.com/golang/tools/tree/master/cmd/guru https://github.com/golang/tools/tree/master/cmd/guru), specifically implements.go if you're interested.