Require Import BinPos.
Require Import List.
Ltac list_fold_right fcons fnil l :=
match l with
| (
cons ?x ?tl) =>
fcons x ltac:(list_fold_right
fcons fnil tl)
|
nil =>
fnil
end.
Ltac lazy_list_fold_right fcons fnil l :=
match l with
| (
cons ?x ?tl) =>
let cont :=
lazy_list_fold_right fcons fnil in
fcons x cont tl
|
nil =>
fnil
end.
Ltac list_fold_left fcons fnil l :=
match l with
| (
cons ?x ?tl) =>
list_fold_left fcons ltac:(fcons
x fnil)
tl
|
nil =>
fnil
end.
Ltac list_iter f l :=
match l with
| (
cons ?x ?tl) =>
f x;
list_iter f tl
|
nil =>
idtac
end.
Ltac list_iter_gen seq f l :=
match l with
| (
cons ?x ?tl) =>
let t1 _ :=
f x in
let t2 _ :=
list_iter_gen seq f tl in
seq t1 t2
|
nil =>
idtac
end.
Ltac AddFvTail a l :=
match l with
|
nil =>
constr:(cons
a l)
| (
cons a _) =>
l
| (
cons ?x ?l) =>
let l' :=
AddFvTail a l in constr:(cons
x l')
end.
Ltac Find_at a l :=
let rec find n l :=
match l with
|
nil =>
fail 100 "anomaly: Find_at"
| (
cons a _) =>
eval compute in n
| (
cons _ ?l) =>
find (
Psucc n)
l
end
in find 1%positive
l.
Ltac check_is_list t :=
match t with
|
cons _ ?l =>
check_is_list l
|
nil =>
idtac
|
_ =>
fail 100 "anomaly: failed to build a canonical list"
end.
Ltac check_fv l :=
check_is_list l;
match type of l with
|
list _ =>
idtac
|
_ =>
fail 100 "anomaly: built an ill-typed list"
end.