Function: vaultBurnDebtTokenCallback(uint256 amount)

This function is used to burn debt tokens for a smart vault. It is expected to be called from the smart vault during _burnDebtToken.

Inputs

• amount

  • Control: Not controllable, calculated in the contract.

  • Constraints: Amount is not zero (validated in the _burnDebtToken).

  • Impact: Amount of debt token to burn.

Branches and code coverage

Intended branches

• Check if the caller is the smart vault.

  Test coverage

• Call burn on the debt token.

  Test coverage

Negative behavior

• Revert if the caller is not the smart vault.

  Negative test

• Revert if the debt-token burning fails.

  Negative test

Function call analysis

• this.debtToken.burn(msg.sender, amount)

  • What is controllable? Nothing.

  • If the return value is controllable, how is it used and how can it go wrong? It is safe because _burnDebtToken, which calls vaultBurnDebtTokenCallback, performs a balance check after burning.

  • What happens if it reverts, reenters or does other unusual control flow? A revert indicates a failure in the burn process, and since the debtToken is expected to be an ERC-20 address, there is no reentrancy risk.