[{"check": "solc-version", "impact": "Informational", "confidence": "High", "description": "Old version (<0.4.23) of Solidity used in tests/old_solc.sol.json:\n\t- old_solc.sol declares pragma solidity0.4.21\n", "elements": [], "expressions": [{"expression": "0.4.21", "source_mapping": {"start": 0, "length": 23, "filename": "old_solc.sol", "lines": []}}]}]