Goal:
    A : Type  P : A → Type  a : A  X : All P [a]
  ============================
   (P a)


DEBUG:Going to execute:
try intros until H; intro_block_id H || intro_block H
Level 1: evaluation returns
try intros until H; intro_block_id H || intro_block H;
 (try simpl in H; DepElim.simplify_equations_in H)
where
H := X
of type
constr of type tacvalue