Goal:
    X1' : list A.t  X1 : list A.t  X : lt_ X1' X1
  ============================
   (forall x : t,
    {| pr1 := x; pr2 := x |} = {| pr1 := X1'; pr2 := X1 |} ->
    let H := CoreTactics.block in let H0 := CoreTactics.block in False)


DEBUG:Going to execute:
cbv beta iota delta [TODO projection TODO projection] in id, id'
DEBUG LTAC Evaluated term: X1
DEBUG LTAC Evaluated term: (list A.t)
Level 4: type of id
 has value 
(list A.t)