tempory workaround

this is not quite correct:
begin(function(a,plus(1,a))(1),type(a))

but this works again:
1 : set(mw,function(bal,function(am,set(bal,plus(bal,am)))))
1=> function(list(bal), function(am, set(bal, plus(bal, am))))

2 : set(w, mw(10))
2=> function(list(am), set(bal, plus(bal, am)))

3 : w(2)
3=> 12

4 : w(2)
4=> 14