Error: Invalid function application. Expected 0 args, got 1 for function

[hmzdot]

onyedikachi#4413 on Discord's question

please where am I getting it wrong here:
The code:

 const [ timeRemaining, keepGoing ] = makeDeadline(deadline);
        const [IusersPaid, InumUsers] = 
        parallelReduce([ usersPaid, numUsers ])
          .invariant(balance() == numUsers * amt)
          .while(keepGoing())
          .api(
              C.contribute,
>               () => amt, // Error here
              (returnFunc) => {
                contributorsSet.insert(this);
                InumUsers +=  1;
                returnFunc(null)
                return [usersPaid, numUsers]
              }
          )
          .timeRemaining(timeRemaining());;

Error: Invalid function application. Expected 0 args, got 1 for function defined at /app/index.rsh:66:18:function expReachRE0000

[hmzdot]

What is the signature of the C.contribute?

[onyedikachi-david]

This is the full code, so you can have a purview

const start = lastConsensusTime() + 2;
    const deadline = start + duration;

    const usersPaidSet = new Set();
    const contributorsSet = new Set();

    var [usersPaid, numUsers] = [0, 0];
    invariant(balance() == amt && usersPaid <= numUsers);
    while(true) {
        // commit();
        // contribute api
        // -- A user calls the contribute api
        // -- increment the number of users who has contributed.
        // -- add the user to the set of users who has contributed.

        // ====> Should be a while loop with a parallelReduce

        const [ timeRemaining, keepGoing ] = makeDeadline(deadline);
        const [IusersPaid, InumUsers] = 
        parallelReduce([ usersPaid, numUsers ])
          .invariant(balance() == numUsers * amt)
          .while(keepGoing())
          .api(
              C.contribute,
              (() => amt),
              ((returnFunc) => {
                contributorsSet.insert(this);
                InumUsers +=  1;
                returnFunc(null)
                return [usersPaid, numUsers]
              })
          )
          .timeRemaining(timeRemaining());;
        // const [[], returnFunc] = 
        //     call(C.contribute)
        //         .pay(() => contributionAmt)
        //         contributorsSet.insert(this);
        //         // add a view that notifies contribution
        //         returnFunc();
        // wait or delay participation untill 
        // payment time is reached

        // pay api
        // -- a user calls the api for payment
        // -- a check to make sure the user hasnt been paid before.
        // -- a check to make sure the user is a contributor
        // -- send balance to the user address.
        // -- add the user to the set of users paid.
        // -- increment the number of users paid.

        const [[], returnPayFunc] =
        call(A.recievePayment)
            .pay(() => 0)
            .assume(() => {
                check(!usersPaidSet.member(this));
            })
            transfer(balance()).to(this)
            usersPaidSet.insert(this);
            returnFunc(null);





        // payment api

        // Is it possible to add an event that will
        // notify another contribution phase.
        continue;
    }

[onyedikachi-david]

contribute: Fun([UInt], Null), // reveal the amount to pay

I see where the problem is... lol, I Changed before to this : contribute: Fun([], Null) maybe it didnt save or something.

[onyedikachi-david]

There's a new error:

Invalid Reach l-value syntax: InumUsers. Mutation is not allowed unless before continueReachRE0032

InumUsers = InumUsers + 1;

[onyedikachi-david]

I changed it to this:

        .api(
              C.contribute,
              (() => amt),
              ((returnFunc) => {
                contributorsSet.insert(this);
                returnFunc(null)
                // InumUsers = InumUsers +  1;
                return [usersPaid, numUsers + 1]
              })

Thanks