It is currently possible to shadow built-in globals in Solidity. This allows contracts to override the functionality of built-ins such as msg and revert(). Although this is intended, it can mislead users of a contract as to the contract's true behavior.

contract PretendingToRevert {
    function revert() internal constant {}

contract ExampleContract is PretendingToRevert {
    function somethingBad() public {

Contract users (and auditors) should be aware of the full smart contract source code of any application they intend to use.

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