Goal:
    x : V.t  p : VSet.t  a : V.t  H : VSet.In a p -> False  H1 : VSet.In a p
  ============================
   False


DEBUG:Going to execute:
assert X2
Level 1: evaluation returns
assert X2; [ exact (id0 id1) | clear id0 ]
where
id1 := H1
of type
intropattern
id0 := H
of type
intropattern
flags := 
of type
tauto_flags
X2 := False
of type
constr of type tacvalue