Goal:
  
  A : Type
  P : A → A → Type
  l' : list A
  f : A → A
  hp : ∀ x y : A, P (f x) y → ∑ y' : A, y = f y'
  hd : A
  tl : list A
  tl' : list A
  o : OnOne2 P tl tl'
  ============================
   ({| pr1 := []; pr2 := l' |} = {| pr1 := hd :: tl; pr2 := hd :: tl' |}
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in
      ∑ l'' : list A, OnOne2 (λ x y : A, P (f x) (f y)) [] l'')


DEBUG:Going to execute:
<coq-equations.plugin::simplify@0> $1

Goals:

DEBUG:Going to execute:
cbv beta

Goals:

DEBUG:Going to execute:
DepElim.simplify_IH_hyps

Goals:

DEBUG:Going to execute:
repeat
            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

Goals:

DEBUG:Going to execute:
DepElim.unblock_dep_elim

Goals:

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

Goals:

DEBUG:Going to execute:
CoreTactics.unblock_goal

Goals:

DEBUG:Going to execute:
unfold CoreTactics.block in *; cbv zeta

Goals:

DEBUG:Going to execute:
unfold CoreTactics.block in *

Goals:

DEBUG:Going to execute:
cbv zeta

Goals:

DEBUG:Going to execute:
constructor

Goals:

DEBUG:Going to execute:
<coq-core.plugins.ltac::constructor@0>