Goal:
    x : t  X : lt x x
  ============================
   (let H := CoreTactics.block in let H0 := CoreTactics.block in False)


DEBUG:Going to execute:
needs_generalization id; DepElim.generalize_sig_vars_dest id
Level 2: evaluation returns
(needs_generalization id; DepElim.generalize_sig_vars_dest id) || idtac
where
id := X
of type
constr of type tacvalue

Level 1: evaluation returns
(needs_generalization id; DepElim.generalize_sig_vars_dest id) || idtac
where
id := X
of type
constr of type tacvalue