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+(* An example with constr subentries *)
+
+Module A.
+
+Declare Custom Entry myconstr.
+
+Notation "[ x ]" := x (x custom myconstr at level 6).
+Notation "x + y" := (Nat.add x y) (in custom myconstr at level 5).
+Notation "x * y" := (Nat.mul x y) (in custom myconstr at level 4).
+Notation "< x >" := x (in custom myconstr at level 3, x constr at level 10).
+Check [ < 0 > + < 1 > * < 2 >].
+
+Axiom a : nat.
+Notation b := a.
+Check [ < b > + < a > * < 2 >].
+
+Declare Custom Entry anotherconstr.
+
+Notation "[ x ]" := x (x custom myconstr at level 6).
+Notation "<< x >>" := x (in custom myconstr at level 3, x custom anotherconstr at level 10).
+Notation "# x" := (Some x) (in custom anotherconstr at level 8, x constr at level 9).
+Check [ << # 0 >> ].
+
+End A.
+
+Module B.
+
+Inductive Expr :=
+ | Mul : Expr -> Expr -> Expr
+ | Add : Expr -> Expr -> Expr
+ | One : Expr.
+
+Declare Custom Entry expr.
+Notation "[ expr ]" := expr (expr custom expr at level 2).
+Notation "1" := One (in custom expr at level 0).
+Notation "x y" := (Mul x y) (in custom expr at level 1, left associativity).
+Notation "x + y" := (Add x y) (in custom expr at level 2, left associativity).
+Notation "( x )" := x (in custom expr at level 0, x at level 2).
+Notation "{ x }" := x (in custom expr at level 0, x constr).
+Notation "x" := x (in custom expr at level 0, x ident).
+
+Axiom f : nat -> Expr.
+Check [1 {f 1}].
+Check fun x y z => [1 + y z + {f x}].
+Check fun e => match e with
+| [x y + z] => [x + y z]
+| [1 + 1] => [1]
+| y => [y + e]
+end.
+
+End B.
+
+Module C.
+
+Inductive Expr :=
+ | Add : Expr -> Expr -> Expr
+ | One : Expr.
+
+Declare Custom Entry expr.
+Notation "[ expr ]" := expr (expr custom expr at level 1).
+Notation "1" := One (in custom expr at level 0).
+Notation "x + y" := (Add x y) (in custom expr at level 2, left associativity).
+Notation "( x )" := x (in custom expr at level 0, x at level 2).
+
+(* Check the use of a two-steps coercion from constr to expr 1 then
+   from expr 0 to expr 2 (note that camlp5 parsing is more tolerant
+   and does not require parentheses to parse from level 2 while at
+   level 1) *)
+
+Check [1 + 1].
+
+End C.