Goal:
    m : t  n : t  H : n = m
  ============================
   (n = m)


DEBUG:Going to execute:
constructor 1
Level 4: evaluation returns
<coq-core.plugins.tauto::is_unit_or_eq@0>
where
tauto_flags := 
of type
tauto_flags
X1 := n = m
of type
constr of type tacvalue