Goal:
    x : t  y : t  Heq_anonymous : false = eqb x y  H : x = y
  ============================
   False


DEBUG:Going to execute:
<coq-core.plugins.ltac::unify@0> $1 $2
DEBUG LTAC Evaluated term: (false = eqb x y)
DEBUG LTAC Evaluated term: (x = y)