Bug Report

Starting with mypyc 1.16.0 typingdataclass orNamedTuple withnp.ndarray fails with aKeyError when mypyc compiled. This worked correctly with mypyc 1.15.0 but started failing with 1.16.0 and is still an issue with1.20.0+dev.4eb6b509d2bdecad2bb638050e052174d1f6b3f8. I haven't checked whether this is only reproducible with np.ndarray. But given that it worked with older versions of mypyc, I expect this mmight be a mypyc issue.

To Reproduce

fromdataclassesimportdataclassimportnumpy@dataclassclassFoo:arr:numpy.ndarrayprint(Foo(np.zeros((1,1,3),dtype=np.uint8)))

or

fromtypingimportNamedTupleimportnumpyasnpclassFoo(NamedTuple):arr:np.ndarrayprint(Foo(np.zeros((1,1,3),dtype=np.uint8)))

compiled with

mypyc test.pypython -c "import test"

Expected Behavior

Foo(arr=array([[[0, 0, 0]]], dtype=uint8))

Actual Behavior

Traceback (most recent call last):  File "<string>", line 1, in <module>  File "test.py", line 5, in <module>    arr: np.ndarrayKeyError: 'ndarray'

Your Environment

• Mypy version used: mypy-1.20.0+dev.4eb6b509d2bdecad2bb638050e052174d1f6b3f8
• Mypy command-line flags: mypyc test.py
• Mypy configuration options frommypy.ini (and other config files): none
• Python version used: 3.12.12