DataClass: CPython is requiring @dataclass objects to be initialized

[ubaidsk]

(lp) lpython$ cat examples/expr2.py 
from lpython import i32, dataclass

@dataclass
class A:
    x: i32

def main0():
    a: A
    a.x = 5

main0()
(lp) lpython$ lpython examples/expr2.py
(lp) lpython$ python examples/expr2.py 
Traceback (most recent call last):
  File "/Users/ubaid/Desktop/OpenSource/lpython/examples/expr2.py", line 11, in <module>
    main0()
  File "/Users/ubaid/Desktop/OpenSource/lpython/examples/expr2.py", line 9, in main0
    a.x = 5
UnboundLocalError: local variable 'a' referenced before assignment