Goal:
    A : Type  P : list A → A → Type
  ============================
   (All_fold_nil P = All_fold_nil P)


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

Goals:

DEBUG:Going to execute:
constructor

Goals:

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