A trick of using “Find usages” in IntelliJ IDEA as Go IDE

Recently, I am using IntelliJ IDEA as a Go IDE to browse Docker Swarm code. When I want to search where Discovery.Watch method intoken package is called, the “Find usages“(Alt+F7) function of IntelliJ IDEA gives me a confusion:

It just prints one occurrence: the test code of token package. It doesn’t make sense, where the hell is the Discovery.Watch method called? When I search the usages of Watch in Watcher interface which token.Discovery satisfies by accident, I catch where theDiscovery.Watch method is used:

The caveat from this lesson is if you can’t find where methods of a package are called, you should try to find the interfaces where the packages satisfy, maybe it will give you the answer.