package tezos-protocol-011-PtHangz2

must_exist ctxt contract fails with the Non_existing_contract error if exists ctxt contract returns false. Even though this function is gas-free, it is always called in a context where some gas consumption is guaranteed whenever necessary. The first context is that of a transfer operation, and in that case the base cost of a manager operation (Micheclson_v1_gas.Cost_of.manager_operation) is consumed. The second context is that of an activation operation, and in that case no gas needs to be consumed since that operation is not a manager operation.