guru

gistfile1.txt

<dgryski@kamek[w] \ʕ◔ϖ◔ʔ/ > cat main.go
package main

import "log"

type X struct {
	body string
}

type Message interface {
	Body() string
}

type LoggableMessage interface {
	log()
}

func (x *X) Body() string {
	return x.body
}

func (x *X) log() {
	log.Printf("logging body: %q\n", x.body)
}

func send(m Message) {
	log.Printf("sending: %v", m.Body())

	if l, ok := m.(LoggableMessage); ok {
		l.log()
	}
}

func main() {
	x := X{body: "hello, world"}

	send(&x)
}
<dgryski@kamek[w] \ʕ◔ϖ◔ʔ/ > guru  -scope github.com/dgryski/w callers main.go:#193
/home/dgryski/Dropbox/GITS/gocode/src/github.com/dgryski/w/main.go:21:13: (*github.com/dgryski/w.X).log is called from these 1 sites:
/home/dgryski/Dropbox/GITS/gocode/src/github.com/dgryski/w/main.go:29:8: 	dynamic method call from github.com/dgryski/w.send
<dgryski@kamek[w] \ʕ◔ϖ◔ʔ/ >