[Frontend] Some QASMBench benchmarks fail due to wrong variable references

[lschuetze]

Check the following QASMBench files:

• qasmbench/small/vqe_uccsd_n8/vqe_uccsd_n8.qasm
• qasmbench/small/hhl_n10/hhl_n10.qasm

[lschuetze]

Executing run:hhl_n10 (hybrid-quantum-frontend, test-hybrid-quantum-frontend-small) 1 None None None
cmd: /Users/lschuetze/git/hybrid-quantum-bench/implementations/hybrid-quantum-frontend.sh -i ../benchmarks/qasmbench/small/hhl_n10/hhl_n10.qasm -o ../benchmarks/compiler_generated/small/hhl_n10.mlir
cwd: /Users/lschuetze/git/hybrid-quantum-bench/implementations
Run failed. Return code: 1
Output:

    Traceback (most recent call last):
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 351, in QASMToMLIR
        circuit = qasm2_loads(code, custom_instructions=LEGACY_CUSTOM_INSTRUCTIONS)
      File "/Users/lschuetze/git/hybrid-quantum-bench/.venv/lib/python3.13/site-packages/qiskit/qasm2/__init__.py", line 602, in loads
        return _parse.from_bytecode(
               ~~~~~~~~~~~~~~~~~~~~^
            _qasm2.bytecode_from_string(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        ...<9 lines>...
            custom_instructions,
            ^^^^^^^^^^^^^^^^^^^^
        )
        ^
      File "/Users/lschuetze/git/hybrid-quantum-bench/.venv/lib/python3.13/site-packages/qiskit/qasm2/parse.py", line 242, in from_bytecode
        for op in bc:
                  ^^
    qiskit.qasm2.exceptions.QASM2ParseError: "<input>:186801,8: 'q' is not defined in this scope"
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 399, in <module>
        main()
        ~~~~^^
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 389, in main
        module: Module = QASMToMLIR(code)
                         ~~~~~~~~~~^^^^^^
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 353, in QASMToMLIR
        raise ConversionError(f"QASM2 parse failed: {e}")
    ConversionError: QASM2 parse failed: "<input>:186801,8: 'q' is not defined in this scope"

[lschuetze]

Executing run:vqe_uccsd_n8 (hybrid-quantum-frontend, test-hybrid-quantum-frontend-small) 1 None None None
cmd: /Users/lschuetze/git/hybrid-quantum-bench/implementations/hybrid-quantum-frontend.sh -i ../benchmarks/qasmbench/small/vqe_uccsd_n8/vqe_uccsd_n8.qasm -o ../benchmarks/compiler_generated/small/vqe_uccsd_n8.mlir
cwd: /Users/lschuetze/git/hybrid-quantum-bench/implementations
Run failed. Return code: 1
Output:

    Traceback (most recent call last):
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 351, in QASMToMLIR
        circuit = qasm2_loads(code, custom_instructions=LEGACY_CUSTOM_INSTRUCTIONS)
      File "/Users/lschuetze/git/hybrid-quantum-bench/.venv/lib/python3.13/site-packages/qiskit/qasm2/__init__.py", line 602, in loads
        return _parse.from_bytecode(
               ~~~~~~~~~~~~~~~~~~~~^
            _qasm2.bytecode_from_string(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        ...<9 lines>...
            custom_instructions,
            ^^^^^^^^^^^^^^^^^^^^
        )
        ^
      File "/Users/lschuetze/git/hybrid-quantum-bench/.venv/lib/python3.13/site-packages/qiskit/qasm2/parse.py", line 242, in from_bytecode
        for op in bc:
                  ^^
    qiskit.qasm2.exceptions.QASM2ParseError: "<input>:10813,8: 'q' is not defined in this scope"
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 399, in <module>
        main()
        ~~~~^^
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 389, in main
        module: Module = QASMToMLIR(code)
                         ~~~~~~~~~~^^^^^^
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 353, in QASMToMLIR
        raise ConversionError(f"QASM2 parse failed: {e}")
    ConversionError: QASM2 parse failed: "<input>:10813,8: 'q' is not defined in this scope"

[lschuetze]

Executing run:vqe_uccsd_n4 (hybrid-quantum-frontend, test-hybrid-quantum-frontend-small) 1 None None None
cmd: /Users/lschuetze/git/hybrid-quantum-bench/implementations/hybrid-quantum-frontend.sh -i ../benchmarks/qasmbench/small/vqe_uccsd_n4/vqe_uccsd_n4.qasm -o ../benchmarks/compiler_generated/small/vqe_uccsd_n4.mlir
cwd: /Users/lschuetze/git/hybrid-quantum-bench/implementations
Run failed. Return code: 1
Output:

    Traceback (most recent call last):
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 351, in QASMToMLIR
        circuit = qasm2_loads(code, custom_instructions=LEGACY_CUSTOM_INSTRUCTIONS)
      File "/Users/lschuetze/git/hybrid-quantum-bench/.venv/lib/python3.13/site-packages/qiskit/qasm2/__init__.py", line 602, in loads
        return _parse.from_bytecode(
               ~~~~~~~~~~~~~~~~~~~~^
            _qasm2.bytecode_from_string(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        ...<9 lines>...
            custom_instructions,
            ^^^^^^^^^^^^^^^^^^^^
        )
        ^
      File "/Users/lschuetze/git/hybrid-quantum-bench/.venv/lib/python3.13/site-packages/qiskit/qasm2/parse.py", line 242, in from_bytecode
        for op in bc:
                  ^^
    qiskit.qasm2.exceptions.QASM2ParseError: "<input>:225,8: 'q' is not defined in this scope"
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 399, in <module>
        main()
        ~~~~^^
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 389, in main
        module: Module = QASMToMLIR(code)
                         ~~~~~~~~~~^^^^^^
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 353, in QASMToMLIR
        raise ConversionError(f"QASM2 parse failed: {e}")
    ConversionError: QASM2 parse failed: "<input>:225,8: 'q' is not defined in this scope"

[lschuetze]

Executing run:vqe_uccsd_n6 (hybrid-quantum-frontend, test-hybrid-quantum-frontend-small) 1 None None None
cmd: /Users/lschuetze/git/hybrid-quantum-bench/implementations/hybrid-quantum-frontend.sh -i ../benchmarks/qasmbench/small/vqe_uccsd_n6/vqe_uccsd_n6.qasm -o ../benchmarks/compiler_generated/small/vqe_uccsd_n6.mlir
cwd: /Users/lschuetze/git/hybrid-quantum-bench/implementations
Run failed. Return code: 1
Output:

    Traceback (most recent call last):
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 351, in QASMToMLIR
        circuit = qasm2_loads(code, custom_instructions=LEGACY_CUSTOM_INSTRUCTIONS)
      File "/Users/lschuetze/git/hybrid-quantum-bench/.venv/lib/python3.13/site-packages/qiskit/qasm2/__init__.py", line 602, in loads
        return _parse.from_bytecode(
               ~~~~~~~~~~~~~~~~~~~~^
            _qasm2.bytecode_from_string(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        ...<9 lines>...
            custom_instructions,
            ^^^^^^^^^^^^^^^^^^^^
        )
        ^
      File "/Users/lschuetze/git/hybrid-quantum-bench/.venv/lib/python3.13/site-packages/qiskit/qasm2/parse.py", line 242, in from_bytecode
        for op in bc:
                  ^^
    qiskit.qasm2.exceptions.QASM2ParseError: "<input>:2286,8: 'q' is not defined in this scope"
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 399, in <module>
        main()
        ~~~~^^
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 389, in main
        module: Module = QASMToMLIR(code)
                         ~~~~~~~~~~^^^^^^
      File "/Users/lschuetze/git/hybrid-quantum/frontend/qasm/qasm-import.py", line 353, in QASMToMLIR
        raise ConversionError(f"QASM2 parse failed: {e}")
    ConversionError: QASM2 parse failed: "<input>:2286,8: 'q' is not defined in this scope"

[lschuetze]

The programs in question have an error. They define a quantum register, for example in hhl_n10.qasm like qreg q0[3] but measure the registers with measure q[0] -> c[0]; hence the error q is not in scope.