While private methods of base contracts are not visible and cannot be called directly from the derived contract, it is still possible to declare a function of the same name and type and thus change the behaviour of the base contract's function. This is due to a compiler bug introduced in v0.3.0 and fixed in v0.5.17. (see here)
- Private Functions Base -> Derived
- Not Visible -> Derived
- Function -> Same Name/Type
- Base Private Function
- Change Behavior
- Compiler Bug -> Fixed
solc 0.3.0-> 0.5.17