infer e2 >>= \(s2, t2, e2_) ->
pure (compose s2 s1, TupleType (t1,t2), TupleExpr p (e1_,e2_))
- FunExpr p f args fs = //todo: fix print
+ FunExpr p f args fs =
lookup f >>= \expected ->
let accST = (\(s,ts,es) e->infer e >>= \(s_,et,e_)-> pure (compose s_ s,ts++[et],es++[e_])) in
foldM accST (zero,[],[]) args >>= \(s1, argTs, args_)->