formatting issue with in an error message

[mmvandieren]

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Describe the bug

There seems to be a typo somewhere in the code that generates the error message below because all the formatting commands are displayed instead of executed.

Steps to reproduce the bug

def error_message():
    qubits =qvector(2)
    ctrl.x(qubits[0], qubits[1])

results = cudaq.sample(error_message)

### Expected behavior

shouldn't see the `+ Color.RED` text

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

Not a regression

### Environment

- **CUDA Quantum version**:  0.8.0
- **Python version**: 
- **C++ compiler**: 
- **Operating system**: 

### Suggestions

_No response_

[sacpis]

Don't you need to define the kernel decorator.

@cudaq.kernel
def error_message():
    qubits =qvector(2)
    ctrl.x(qubits[0], qubits[1])

results = cudaq.sample(error_message)

[mmvandieren]

Yeah, the kernel decorator is needed to get the right error message.

The code example is purposefully wrong. What's the issues is that the error message that gets generated has a problem in it.

[sacpis]

I just see this output.

root@6db8d9a389b3:/workspaces/cuda-quantum# python3 examples/python/test.py 
cudaq.kernel.ast_bridge.CompilerError: test.py:6: error: Invalid function call - 'ctrl' is unknown.
         (offending source -> ctrl.x)

Are you running it in Jupyter notebook?

[mmvandieren]

Yep, I'm in a Jupyter notebook in VS Code on my Mac in a container.

[sacpis]

I see the following output when I execute above code to repro the above error message

{
    "name": "NameError",
    "message": "name 'ctrl' is not defined",
    "stack": "---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
Cell In[5], line 7
      4     qubits = cudaq.qvector(2)
      5     ctrl.x(qubits[0], qubits[1])
----> 7 results = cudaq.sample(error_message)

File /usr/local/cudaq/cudaq/runtime/sample.py:87, in sample(kernel, shots_count, noise_model, *args)
     84             cudaq_runtime.setExecutionContext(ctx)
     85     return counts
---> 87 kernel(*args)
     88 res = ctx.result
     89 cudaq_runtime.resetExecutionContext()

Cell In[5], line 5, in error_message()
      3 def error_message():
      4     qubits = cudaq.qvector(2)
----> 5     ctrl.x(qubits[0], qubits[1])

NameError: name 'ctrl' is not defined"
}