Rant: Wing doens't let me be a never nester

[eladb]

Once upon a time, a friend told be about the never nesters, and I immediately knew I found my people.

Wing has this really awesome feature called if let which allows me to write nil-safe code:

if let x = canBeNil {
  log("x is not nil! yes!);
}

This is all great, but the problem is that oftentimes, nil represents the "unhappy path" and us, never nesters, prefer to bail out early from unhappy paths, so we can continue to never nest our way through the happy path.

This cases my happy path look like this, and my never nesting values to be flushed down the toilet:

if let x = foo() {
  if let y = bar() {
    if let z = geez() {
      // is this how happiness looks like?
    }

    throw "bad geez!";
  }

  throw "bad bar!";
}

throw "bad foo!";

Can we make a never nester happy and offer a negative if let? Maybe something like this:

let x = foo() ?? {
  throw "bad foo!";
};


let y = bar() ?? {
  throw "bad bar!";
};


let z = geez() ?? {
  throw "bad geez!";
}

// is this how happiness looks like!

[eladb]

Here's a pretty ugly workaround:

let x = () => {
  if let x = foo() { return x; }
  throw "bad foo!";
}();


let y = () => {
  if let x = bar() { return x; }
  throw "bad bar!";
}();


let z = () => {
  if let x = geez() { return x; }
  throw "bad geez!";
}();