Suppose you have the following interface:

package abc
//go:generate $GOPATH/src/github.com/maxbrunsfeld/counterfeiter/counterfeiter -o FakeFoo.go . Foo

type Foo interface {
	Bar() error
}

After generating fakes, the output fake includes the following line to ensure FakeFoo is meeting the abc.Foo interface:

var _ abc.Foo = new(FakeFoo)

Note that we output this fake to the abc package, so the abc. identifier in front of Foo is not necessary, and actually causes an import cycle.