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variable shadowing

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Variable Shadowing

Variable shadowing occurs when a variable declared within a certain scope (decision block, method, or inner class) has the same name as a variable declared in an outer scope.

Attack

This depends a lot on the code of the contract itself. For instance, in the this example, variable shadowing prevents the owner of contract C from performing self destruct

Mitigation

The solidity compiler has some checks to emit warnings when it detects this kind of issue, but it has known examples where it fails.