Goal:
  
  A : Type
  B : Type
  R : A → B → Type
  R' : ∀ (a : A) (b : B), R a b → Type
  ============================
   (eq_refl = eq_refl)


DEBUG:Going to execute:
try DepElim.rewrite_sigma2_refl
Level 1: Backtrace:

Rewriting base refl_id does not exist.
Level 1: Backtrace:

Rewriting base refl_id does not exist.