Goal:
  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  tl : list A
  tl' : list A
  X : OnOne2 P tl tl'
  IHX : All Q tl → All Q tl'
  q : Q hd
  H : All Q tl
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in All Q (hd :: tl'))


DEBUG:Going to execute:
match goal with
           | hyp:context [ CoreTactics.block ]
             |- _ =>
                 cbn beta in hyp; eqns_specialize_eqs_block hyp;
                  cbn[eq_rect_r eq_rect] in hyp
           end
Level 0: Backtrace:

No matching clauses for match.

Goals:
  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  hd' : A
  tl : list A
  p : P hd hd'
  q : Q hd
  H : All Q tl
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in All Q (hd' :: tl))

  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  tl : list A
  tl' : list A
  X : OnOne2 P tl tl'
  IHX : All Q tl → All Q tl'
  q : Q hd
  H : All Q tl
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in All Q (hd :: tl'))


DEBUG:Going to execute:
DepElim.unblock_dep_elim
Level 0: Backtrace:

No matching clauses for match.

Goals:
  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  hd' : A
  tl : list A
  p : P hd hd'
  q : Q hd
  H : All Q tl
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in All Q (hd' :: tl))

  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  tl : list A
  tl' : list A
  X : OnOne2 P tl tl'
  IHX : All Q tl → All Q tl'
  q : Q hd
  H : All Q tl
  ============================
   (let H := CoreTactics.block in
    let H0 := CoreTactics.block in All Q (hd :: tl'))


DEBUG:Going to execute:
match goal with
           | |- let _ := CoreTactics.block in ?T =>
                 match T with
                 | context [ CoreTactics.block ] =>
                     change T; CoreTactics.intros_until_block
                 end
           | _ => CoreTactics.unblock_goal
           end