Implicit tuple unpack

[momohatt]

Maybe the second one should raise type error?

> ((lambda [$x $y] (+ x y)) 1 2)
3
> ((lambda [$x $y] (+ x y)) [1 2])
3

[egisatoshi]

In fact, it is the specification of Egison.

((lambda [$x $y] (+ x y)) 1 2) is a kind of syntax sugar of ((lambda [$x $y] (+ x y)) [1 2]), though there is a possibility that this specification will change if we support Currying as Haskell in future.

[momohatt]

Right, but I think this can be confusing to normal functional programmers, as noted by one of the users...:
https://nekketsuuu.github.io/entries/2018/09/19/egison.html