Serious bug fixed:

Serious bug fixed:
 - in order to look for coercions to sort and funclass, we passed
   types containing implicits and a flag to avoid unification
 - totally avoiding unification, it happened
    1) that we diverged:
       t : A :> B ==> inject t : Sigma x.A :> B ==> eject (inject t): A :> B
    2) that we called unification on types that contained implicits
       (in some cases)