register_jitable -ed function not recognized when used as arg to njit function

[LunarLanding]

Reporting a bug

register_jitable-ed function is not recognized when used as arg to njit-ed function.

Numba version: 0.53.1
Code:

import numba as nb
import numba.extending

@nb.extending.register_jitable
def g(x):
    return 2*x

@nb.njit
def f(g,x):
    x+=1
    return g(x)

f(g,2)

---------------------------------------------------------------------------
TypingError                               Traceback (most recent call last)
<ipython-input-1-cbb9b70cf0f8> in <module>
     11     return g(x)
     12 
---> 13 f(g,2)

~/miniconda3/lib/python3.9/site-packages/numba/core/dispatcher.py in _compile_for_args(self, *args, **kws)
    418                 e.patch_message(msg)
    419 
--> 420             error_rewrite(e, 'typing')
    421         except errors.UnsupportedError as e:
    422             # Something unsupported is present in the user code, add help info

~/miniconda3/lib/python3.9/site-packages/numba/core/dispatcher.py in error_rewrite(e, issue_type)
    359                 raise e
    360             else:
--> 361                 raise e.with_traceback(None)
    362 
    363         argtypes = []

TypingError: Failed in nopython mode pipeline (step: nopython frontend)
non-precise type pyobject
During: typing of argument at <ipython-input-1-cbb9b70cf0f8> (10)

File "<ipython-input-1-cbb9b70cf0f8>", line 10:
def f(g,x):
    x+=1
    ^

This error may have been caused by the following argument(s):
- argument 0: Cannot determine Numba type of <class 'function'>

• I have tried using the latest released version of Numba (most recent is
  visible in the change log (https://github.com/numba/numba/blob/master/CHANGE_LOG).
• I have included a self contained code sample to reproduce the problem.
  i.e. it's possible to run as 'python bug.py'.

Swaping register_jitable for njit works:

import numba as nb
import numba.extending

# @nb.extending.register_jitable
@nb.njit
def g(x):
    return 2*x

@nb.njit
def f(g,x):
    x+=1
    return g(x)

f(g,2)

6