List of list in kernel argument gives error

[marwafar]

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Describe the bug

import cudaq

my_list=[[0,1],[2,3,4]]

@cudaq.kernel
def kernel(my_list:list[list[int]]):
    q=cudaq.qvector(5)
    
    for list in my_list:
        for idx in list:
            x(q[idx])

counts=cudaq.sample(kernel,my_list)
print(counts)

running the above code gives this error:
RuntimeError: error: Cannot infer CUDA-Q type from provided
Python type (!cc.stdvec<!cc.stdvec>)

Steps to reproduce the bug

import cudaq

my_list=[[0,1],[2,3,4]]

@cudaq.kernel
def kernel(my_list:list[list[int]]):
    q=cudaq.qvector(5)
    
    for list in my_list:
        for idx in list:
            x(q[idx])

counts=cudaq.sample(kernel,my_list)
print(counts)

The issue seems to be with actually calling the kernel. Doing a print(kernel) works, and seems to return valid MLIR

Expected behavior

The kernel should be correctly compiled and apply x gate on all qubits and have 11111 state when print counts.

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

Not a regression

Environment

• CUDA-Q version: 0.9.1
• Python version: 3.10
• C++ compiler:
• Operating system: Linux

Suggestions

No response

[bebora]

Duplicate of #1809.