let? ignores variable name in generated javascript

[glennsl]

This reduces readability and causes problems with js interop.

Example:

let fromString: string => option<int> = str => {
  let? Some(num) = str->Float.fromString
  num === %raw("num | 0") && Float.isFinite(num) ? Obj.magic(num) : None
}

generates:

function fromString(str) {
  let x = Stdlib_Float.fromString(str);
  if (x !== undefined && !(x === (num | 0) && isFinite(x))) {
    return;
  } else {
    return x;
  }
}

[zth]

That looks like an oversight, and something easy to fix if anyone seeing this is interested in taking a stab at working with the compiler. It's all in the BS builtin PPX file.

[HuijungYoon]

Hi can i work for this issue?