Goal:
    A : Type  B : Type  C : Type  R : A → B → C → Type
  ============================
   (eq_refl = eq_refl)


DEBUG:Going to execute:
PTRDEBUGTACrepeat (simpl; DepElim.hnf_eq; DepElim.rewrite_refl_id);
            try progress autounfold with equations
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.