Goal:
    A : Type  E : EqDec A  x : A  y : A
  ============================
   (reflectProp (x = y) (eq_dec_to_bool x y))


DEBUG:Going to execute:
match goal with
           | H:_ /\ _ |- _ => destruct H
           | H:(_ * _)%type |- _ => destruct H
           end