solidity/test/libsolidity/syntaxTests/inheritance/override/override_multiple_no_virtual2.sol

contract A
{
	function foo() virtual internal {}
}
contract B
{
	function foo() internal {}
}
contract C is A, B
{
}
// ----
// TypeError: (94-116): Derived contract must override function "foo". Two or more base classes define function with same name and parameter types.