Event overwritten with incompatible one

[frangio]

The following code compiles without warnings, even though Foo overwrites the Approve(address,address) event with an incompatible one. This should fail to compile because it's not an overloading of Approve with a different signature, but a replacement of it with an incompatible one, because of the indexed.

pragma solidity ^0.4.24;

contract IFoo {
    event Approve(address a, address b);
}
contract Foo is IFoo {
    event Approve(address indexed a, address b);
}

Related to #4168.

[chriseth]

@axic do we want to fix this with 0.5.0?

[leonardoalt]

@axic This is inheritance related, since the problem is that the events from the super contract are not propagating. Do we still want it for 0.5.0 or for the Inheritance project?

[chriseth]

Duplicate of #3421