title: Numba Signature for jitted function as argument
body: <p>I've looked in the numba documentation, but couldn't find anything.</p>
  <p>I have a function to jit that takes a jitted_function as argument. I want to make eager compilation by adding a signature, just like:</p>
  <pre><code>@jit(float64('jit_func.type', int32, int32...))
  </code></pre>
  <p>'jitted_func.type' should be the &quot;function type&quot;</p>
  <p>when I do:</p>
  <pre><code>type(jitted_func)
  </code></pre>
  <p>I get a CPUDispatcher object</p>
  <p>thanks for your help!</p>