Support for Record type in jitclass

---

Feature request

It would be great if it was possible to have Record type member in jitclass.

import numpy as np
import numba
from numba.experimental import jitclass
my_type = np.dtype([("age", np.int32), ("height", np.int32)])
a = np.zeros(1, dtype=my_type)[0]

spec=[
    ("_a", numba.typeof(a))
]
@jitclass(spec=spec)
class A:
    def __init__(self, a):
        self._a = a
        
A(a) # This throw below exception

Traceback (most recent call last):
  File "/opt/test/test.py", line 15, in <module>
    A(a) # This throw below exception
  File "/opt/python/py3.9/lib/python3.9/site-packages/numba/experimental/jitclass/base.py", line 124, in __call__
    return cls._ctor(*bind.args[1:], **bind.kwargs)
  File "/opt/python/py3.9/lib/python3.9/site-packages/numba/core/dispatcher.py", line 482, in _compile_for_args
    error_rewrite(e, 'typing')
  File "/opt/python/py3.9/lib/python3.9/site-packages/numba/core/dispatcher.py", line 423, in error_rewrite
    raise e.with_traceback(None)

numba.core.errors.TypingError: Failed in nopython mode pipeline (step: nopython frontend)
Internal error at <numba.core.typeinfer.CallConstraint object at 0x7f42aef1b280>.
Failed in nopython mode pipeline (step: native lowering)
use load_from_data_pointer() instead

File "test.py", line 13:
    def __init__(self, a):
        self._a = a
        ^

During: lowering "(self)._a = a" at /opt/test/test.py (13)
During: resolving callee type: jitclass.A#7f4306358400<_a:Record(age[type=int32;offset=0],height[type=int32;offset=4];8;False)>
During: typing of call at <string> (3)

Enable logging at debug level for details.

File "<string>", line 3:
<source missing, REPL/exec in use?>

This was tested on latest numba version (0.54.0)

[iyz91]

I would appreciate this as well. Can currently set Numpy structured arrays on jitclasses no problem, but can’t set a specific accessed row (with roughly the same error above). Current workaround is to just keep track of the index I want and access the row on the higher ndarray as needed in the methods instead of storing it for easier access.

[esc]

Removing both the ‘needtriage’ and ‘stale’ labels.