The doc could only display implemented interfaces that it knows about, so when you generate the docs they show which interfaces a type implements from within th

The doc could only display implemented interfaces that it knows about, so when you generate the docs they show which interfaces a type implements from within that particular library (and it's dependencies, since go takes it all as source code). You wouldn't, however, know which interfaces from github.com/foo are implemented by types of bitbucket.org/bar unless their docs were somehow generated together.