No value defined for temporary

[cgay]

Reproducer: https://play.opendylan.org/shared/d085b8e00fe79ab9

iterate loop (a = #f, b = 1)
  if (b == 3)
    b
  else
    loop(b, b + 1)
  end
end

The above compiles without error if loop(b, b + 1) is changed to loop(a, b + 1).

[housel]

This might be a duplicate of #1461.

[housel]

Fixed by #1622.