31 lines
993 B
Ruby
31 lines
993 B
Ruby
import "erc20.spec"
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methods {
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maxFlashLoan(address) returns(uint256) envfree
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_burn(address account, uint256 amount) returns(bool) => specBurn(account, amount)
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}
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ghost mapping(address => uint256) trackedBurnAmount;
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// retuns needed to overcome current CVL limitations: "could not type expression "specBurn(account,amount)", message: A summary must return a simple type, but specBurn(account,amount) returns 'void'"
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function specBurn(address account, uint256 amount) returns bool {
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trackedBurnAmount[account] = amount;
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return true;
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}
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// Check that if flashLoan() call is successful, then proper amount of tokens was burnt(fee + flashLoan amount)
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rule letsWatchItBurns(env e) {
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address receiver;
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address token;
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uint256 amount;
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bytes data;
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uint256 feeBefore = flashFee(e, token, amount);
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flashLoan(e, receiver, token, amount, data);
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uint256 burned = trackedBurnAmount[receiver];
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assert to_mathint(amount + feeBefore) == burned, "cheater";
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}
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