name resolution in class-level list comprehension (python 2)

[bwo]

This code is legal in Python 2:

class A(object):
    x = 1
    y = [x + 1 for _ in range(10)]

It seems not to be legal in Python 3.

However, even with -2, mypy does not allow it:

~/src 12:38:46 $ python3 foo.py
Traceback (most recent call last):
  File "foo.py", line 1, in <module>
    class A(object):
  File "foo.py", line 3, in A
    y = [x + 1 for _ in range(10)]
  File "foo.py", line 3, in <listcomp>
    y = [x + 1 for _ in range(10)]
NameError: name 'x' is not defined
~/src 12:38:55 $ python foo.py
~/src 12:38:57 $ mypy -2 foo.py
foo.py:3: error: Name 'x' is not defined

Expected behavior: the code should typecheck in py2 mode.

ETA: version 0.550; apologies if this is fixed. (Confirmed on 0.630.)

[JukkaL]

Closing due to Python 2 feature freeze (#12237).