func fnOut(t *eval.Thread, args []eval.Value, res []eval.Value) {
	if curProc == nil {
		t.Abort(NoCurrentGoroutine{})
	}
	err := curProc.Out()
	if err != nil {
		t.Abort(err)
	}
	// TODO(austin) Only in the command form
	printCurFrame()
}

func fnBpSet(t *eval.Thread, args []eval.Value, res []eval.Value) {
	// TODO(austin) This probably shouldn't take a symbol name.
	// Perhaps it should take an interface that provides PC's.
	// Functions and instructions can implement that interface and
	// we can have something to translate file:line pairs.
	if curProc == nil {
		t.Abort(NoCurrentGoroutine{})
	}
	name := args[0].(eval.StringValue).Get(t)
	fn := curProc.syms.LookupFunc(name)
	if fn == nil {
		t.Abort(UsageError("no such function " + name))
	}
	curProc.OnBreakpoint(proc.Word(fn.Entry)).AddHandler(EventStop)
}

func fnContWait(t *eval.Thread, args []eval.Value, res []eval.Value) {
	if curProc == nil {
		t.Abort(NoCurrentGoroutine{})
	}
	err := curProc.ContWait()
	if err != nil {
		t.Abort(err)
	}
	// TODO(austin) Only in the command form
	ev := curProc.Event()
	if ev != nil {
		fmt.Printf("%v\n", ev)
	}
	printCurFrame()
}

func (v remoteFramePtr) Get(t *eval.Thread) eval.Value {
	g := v.p.curGoroutine
	if g == nil || g.frame == nil {
		t.Abort(NoCurrentGoroutine{})
	}

	for f := g.frame; f != nil; f = f.aOuter(t) {
		if f.fn != v.fn {
			continue
		}

		// TODO(austin): Register for shootdown with f
		return v.rt.mk(remote{f.fp, v.p})
	}

	t.Abort(NotOnStack{v.fn, g})
	panic("fail")
}

func (v remotePackage) Assign(t *eval.Thread, o eval.Value) {
	t.Abort(ReadOnlyError("remote packages cannot be assigned to"))
}

func (v remoteFramePtr) Set(t *eval.Thread, x eval.Value) {
	// Theoretically this could be a static error.  If remote
	// packages were packages, remote frames could just be defined
	// as constants.
	t.Abort(ReadOnlyError("remote frames cannot be assigned to"))
}