TODO() which prints the source code location

TODO.go

//go:noinline
func TODO(...interface{}) {
	_todo()
	// panic("TODO")
}

//go:noinline
func _todo() {
	funcName := "<unknown function>"
	fileName := "<unknown file>"
	fileLine := 0

	pc := make([]uintptr, 1)
	n := runtime.Callers(3, pc)
	if n > 0 {
		f, _ := runtime.CallersFrames(pc[:n]).Next()
		funcName = f.Function
		fileName = f.File
		fileLine = f.Line
	}

	if i := strings.LastIndex(fileName, "/"); i >= 0 {
		fileName = fileName[i+1:]
	}
	if i := strings.LastIndex(funcName, "."); i >= 0 {
		funcName = funcName[i+1:]
	}

	debug.Printf("TODO in %s (%s:%d)", funcName, fileName, fileLine)
}