INFO:Detectors:
Pragma version "0.4.21" allows old versions (None)
Reference: https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-versions-of-solidity
INFO:Slither:/home/travis/build/crytic/slither/scripts/../tests/expected_json/old_solc.sol.json.solc-version.json exists already, the overwrite is prevented
INFO:Slither:tests/old_solc.sol.json analyzed (1 contracts), 1 result(s) found