nit: What syntax for multiple returns?

For the definition site, things seems straightforward.

fun div(a, b: Int): Int, Int do
   return (a/b, a%b)
end

The only question is about parentheses. In the current grammar, parentheses are mandatory in the return. But do we still force them to be mandatory in the signature foo(a,b:Int): (Int, Int) ?

For the client site, things become quite complex.

Do we force parenthesis in left-values?

(q, r) = div(7, 3) # or
q, r = div(7, 3)

Do we allow any kind of left-values? Especially when each left value in a multiple-return can have a distinct nature.

var q, var r = div(7,3)

var q
#...
q, var r = div(7,3)

x.foo.bar, y.baz["hello"] = div(7,3)