Enhancement: for-in loop tuple assignment

[dumblob]

It would be quite convenient to allow assignment to a tuple in a for-in loop like this:

m={0->5, 1->6, 2->7}
for ((a,b) in m) io.writeln(a, b)

[Night-walker]

It would also be nice if the value yielded in for-in in case of a map would be a named tuple.