INFO:Detectors:
ContractWithFunctionNotCalled.funcNotCalled3() (tests/external_function.sol#13-15) should be declared external
ContractWithFunctionNotCalled.funcNotCalled2() (tests/external_function.sol#17-19) should be declared external
ContractWithFunctionNotCalled.funcNotCalled() (tests/external_function.sol#21-23) should be declared external
ContractWithFunctionNotCalled2.funcNotCalled() (tests/external_function.sol#32-39) should be declared external
Reference: https://github.com/crytic/slither/wiki/Detector-Documentation#public-function-that-could-be-declared-as-external
INFO:Slither:tests/external_function.sol analyzed (5 contracts), 4 result(s) found