NVIDIA / NVIDIA/cuda-quantum

[python, run] Creating data classes with constructors generates empty return

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Since Jun 24, 2025.

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Description

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Describe the bug

Creating data classes with constructors generates empty return

Steps to reproduce the bug

@dataclass
class MyClass:
    def __init__(self, i):
        self.x = i

@cudaq.kernel
def bugSP2() -> MyClass:
    return MyClass(-13)

print(cudaq.run(bugSP2, shots_count = 2))

Output:
[]

Expected behavior

Error if an __init__ is defined in a data class.

Is this a regression? If it is, put the last known working version (or commit) here.

Not a regression

Environment
  • CUDA-Q version:
  • Python version:
  • C++ compiler:
  • Operating system:
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