NUMBA_DISABLE_JIT causes an infinite loop in Structref instance creation.

[bairdlampard534]

import os
os.environ['NUMBA_DISABLE_JIT'] = '1'

import numba
import numpy as np
from numba import njit
from numba.core import types
from numba.experimental import structref

@structref.register
class ValueType(types.StructRef):
    def preprocess_fields(self, fields):
        return tuple((name, types.unliteral(typ)) for name, typ in fields)
class Value(structref.StructRefProxy):
    def __new__(cls, val):
        return structref.StructRefProxy.__new__(cls, val)
    @property
    def val(self):
        return Value_get_val(self)
@njit
def Value_get_val(self):
    return self.val
structref.define_proxy(Value, ValueType, ["val"])
@njit
def div_by_zero(node):
    return node.val / 0
node1 = Value(54321)
div_by_zero(node1)

---------------------------------------------------------------------------
RecursionError                            Traceback (most recent call last)
structref_mini_test.py in 
     35     return node.val / 0
     36 
---> 37 node1 = Value(54321)
     38 
     39 div_by_zero(node1)
structref_mini_test.py in __new__(cls, val)
     18 class Value(structref.StructRefProxy):
     19     def __new__(cls, val):
---> 20         return structref.StructRefProxy.__new__(cls, val)
     21 
     22     @property
~/anaconda3/envs/py38/lib/python3.8/site-packages/numba/experimental/structref.py in __new__(cls, *args)
    374             # cache it to attribute to avoid recompilation
    375             cls.__numba_ctor = ctor
--> 376         return ctor(*args)
    377 
    378     @property
~/anaconda3/envs/py38/lib/python3.8/site-packages/numba/experimental/structref.py in ctor(*args)
    371             @njit
    372             def ctor(*args):
--> 373                 return cls(*args)
    374             # cache it to attribute to avoid recompilation
    375             cls.__numba_ctor = ctor
... last 3 frames repeated, from the frame below ...
structref_mini_test.py in __new__(cls, val)
     18 class Value(structref.StructRefProxy):
     19     def __new__(cls, val):
---> 20         return structref.StructRefProxy.__new__(cls, val)
     21 
     22     @property
RecursionError: maximum recursion depth exceeded

[sklam]

Thank you for reporting the issue. I can replicate it on mainline (84f2b5a).