Goal:
    x : t  y : t  z : t  H0 : lt z y  H : compare z x = Lt
  ============================
   (Gt = Gt -> compare x z = Gt)


DEBUG:Going to execute:
<coq-core.plugins.ssreflect::ssrrewrite@0> $1 $2
DEBUG LTAC Evaluated term: compare_lt_lt