There's a build error when you try to compile the app:
✗ go get github.com/3rf/go-unused-funcs
# github.com/3rf/go-unused-funcs/unused
/goprojects/src/github.com/3rf/go-unused-funcs/unused/unused_func_finder.go:91: cannot use serialRes.Callgraph (type []"golang.org/x/tools/oracle/serial".CallGraph) as type []"code.google.com/p/go.tools/oracle/serial".CallGraph in assignment
There's a build error when you try to compile the app: