fun g(a:int) returns (u,v:int)
let
  u = a+1;
  v = a-1;
tel

node f(a:int; c:bool) returns (o:int)
var x,y:int;
let
  (x, y) = (0, 0) fby g(a);
  o = a + x;
tel

node h(a:int; c:bool) returns (o:int)
var x,y:int;
let
  (x, y) = if c then (1, 2) else (0, 0) fby g(a);
  o = a + x;
tel


node p(a:int; c:bool) returns (o:int)
var x,y:int;
let
  (x, y) = (1, 2) fby (0, 0) fby g(a);
  o = a + x;
tel

(*
(v1, v2, ...) fby (e1, e2, ...)
---->
(v1 fby e1, v2 fby e2, ...)


*)