--- /dev/null
+(* Please keep me in sync with brion.inria.fr/gallium/index.php/Lambda_calculus_quotations *)
+
+open Camlp4.PreCast;;
+module CamlSyntax = Camlp4OCamlParser.Make(Camlp4OCamlRevisedParser.Make(Syntax));;
+
+let expr_of_string = CamlSyntax.Gram.parse_string CamlSyntax.expr_eoi;;
+
+module LambdaGram = MakeGram(Lexer);;
+
+let term = LambdaGram.Entry.mk "term";;
+let term_eoi = LambdaGram.Entry.mk "lambda term quotation";;
+
+Camlp4_config.antiquotations := true;;
+
+EXTEND LambdaGram
+ GLOBAL: term term_eoi;
+ term:
+ [ "top"
+ [ "fun"; v = var; "->"; t = term -> <:expr< `Lam(var $v$, $t$) >>
+ | "fun"; v = var; v' = var; "->"; t = term -> <:expr< `Lam(var $v$, `Lam(var $v'$, $t$)) >>
+ | "fun"; v = var; v' = var; v'' = var; "->"; t = term -> <:expr< `Lam(var $v$, `Lam(var $v'$, `Lam(var $v''$, $t$))) >>
+ | "fun"; v = var; v' = var; v'' = var; v''' = var; "->"; t = term -> <:expr< `Lam(var $v$, `Lam(var $v'$, `Lam(var $v''$, `Lam(var $v'''$, $t$)))) >>
+ | "fun"; v = var; v' = var; v'' = var; v''' = var; v'''' = var; "->"; t = term -> <:expr< `Lam(var $v$, `Lam(var $v'$, `Lam(var $v''$, `Lam(var $v'''$, `Lam(var $v''''$, $t$))))) >>
+ ]
+
+ | "app"
+ [ t1 = SELF; t2 = SELF -> <:expr< `App($t1$, $t2$) >> ]
+
+ | "simple"
+ [ `ANTIQUOT((""|"term"), a) -> expr_of_string _loc a
+ | v = var -> <:expr< `Var(var $v$) >>
+ | "("; t = term; ")" -> t
+ ]
+
+ ];
+ var:
+ [[ v = LIDENT -> <:expr< $str:v$ >>
+ | `ANTIQUOT((""|"var"), a) -> expr_of_string _loc a
+ ]];
+ term_eoi:
+ [[ t = term; `EOI -> t ]];
+END;;
+
+let expand_lambda_quot_expr loc _loc_name_opt quotation_contents =
+ LambdaGram.parse_string term_eoi loc quotation_contents;;
+
+(* to have this syntax <:lam< fun k -> k >> *)
+Syntax.Quotation.add "lam" Syntax.Quotation.DynAst.expr_tag expand_lambda_quot_expr;;
+
+Syntax.Quotation.default := "lam";;
+