Actually there is a tool for this. I think the author was simply un-aware of it. It is called oracle* and is able to answer this typing question and many more.

Actually there is a tool for this. I think the author was simply un-aware of it. It is called oracle* and is able to answer this typing question and many more. *: https://code.google.com/p/go/source/browse/cmd/oracle/main.go?repo=tools https://code.google.com/p/go/source/browse/cmd/oracle/main.g...