sum from mapping of structs?

Is it possible to achieve something like this?

contract Vault {
  struct Account {
    uint256 id;
    uint256 shares;
  }

  mapping(address => Account) accounts;
  uint256 totalShares;

  /// #invariant unchecked_sum(accounts.shares) == totalShares;
  function deposit() {
    /// ...
  }
}

[naps62]

@GNSPS thanks for the offer (I will hold you up to that 😄 )

It’s both for a production project, and to potentially use in yAcademy which just started I had scribble on my todo list for a few months now, and decided to give it a try these days to see if it could be a better fit than echidna

[cd1m0]

@nettrino you’re correct - it is not currently possible. However could you post a sample of what you would like supported? If there is enough interest in this feature, and if we can figure out a way to implement it thats friendly to underlying tools (fuzzers/sym. exec engines/verifiers for example) then we can consider it.