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An assertion is a statement, which aborts a program when it evaluates to false. Assert is typically used for debugging and situations which should never happen.

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Difference between require and assert and the difference between revert and throw

I was looking at the docs and I'm looking for clarification on the difference between require and assert and throw and revert. … use for malformed input) Specifically with respect to assert and require, how do you draw the line between malformed input and internal error? …
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