please include function emit.

static L getEmits_tee(Runnable r) {
  new L l;
  temp tempSetThreadLocal(emit_tl, l);
  temp tempSetMCOpt(emit_print := true);
  callF(r);
  ret l;
}

static L mapLike getEmits(O f, O... args) {
  ret getEmits(r { callF(f, args) });
}