Eased the translation from Ligodity AST to Liquidity AST.

More precisely,

  * I commented out the operator "@" on lists in Ligodity (it can
    be implemented as a function, as a workaround).

  * I removed the parallel "let" construct (hence the "and" keyword).

  * I renamed the type "field_assignment" into "field_assign", in
    order to match Pascaligo AST.

  * The reading of the command-line options is now done by
    calling the function [EvalOpt.read], instead of an ugly
    side-effect when loading the binary of the module. Options
    are now found in a record of type [EvalOpt.options].

  * I added support in the Ligodity lexer for #include CPP
    directives.

src/parser/ligodity/AST.ml

@@ -109,14 +109,12 @@ type t = {
 and ast = t
 
 and declaration =
-  Let      of (kwd_let * let_bindings) reg
+  Let      of (kwd_let * let_binding) reg
 | LetEntry of (kwd_let_entry * let_binding) reg
 | TypeDecl of type_decl reg
 
 (* Non-recursive values *)
 
-and let_bindings = (let_binding, kwd_and) Utils.nsepseq
-
 and let_binding = {
   pattern  : pattern;
   lhs_type : (colon * type_expr) option;
@@ -238,7 +236,7 @@ and closing =
 and list_expr =
   Cons   of cons bin_op reg
 | List   of expr injection reg
-| Append of (expr * append * expr) reg
+  (*| Append of (expr * append * expr) reg*)
 
 and string_expr =
   Cat    of cat bin_op reg
@@ -295,9 +293,9 @@ and selection =
   FieldName of variable
 | Component of (string * Z.t) reg par reg
 
-and record_expr = field_assignment reg injection reg
+and record_expr = field_assign reg injection reg
 
-and field_assignment = {
+and field_assign = {
   field_name : field_name;
   assignment : equal;
   field_expr : expr
@@ -320,7 +318,7 @@ and 'a case_clause = {
   rhs     : 'a
 }
 
-and let_in = kwd_let * let_bindings * kwd_in * expr
+and let_in = kwd_let * let_binding * kwd_in * expr
 
 and fun_expr = (kwd_fun * variable * arrow * expr) reg
 
@@ -372,7 +370,8 @@ let region_of_string_expr = function
   String {region;_} | Cat {region;_} -> region
 
 let region_of_list_expr = function
-  Cons {region; _} | List {region; _} | Append {region; _} -> region
+  Cons {region; _} | List {region; _}
+(* | Append {region; _}*) -> region
 
 let region_of_expr = function
   ELogic e -> region_of_logic_expr e
@@ -399,9 +398,9 @@ let norm_fun region kwd_fun pattern eq expr =
       PVar v -> kwd_fun, v, eq, expr
     |      _ -> let value    = Utils.gen_sym () in
                 let fresh   = Region.{region=Region.ghost; value} in
-                let bindings = {pattern; eq;
+                let binding = {pattern; eq;
-                                lhs_type=None; let_rhs = EVar fresh}, [] in
+                               lhs_type=None; let_rhs = EVar fresh} in
-                let let_in   = ghost_let, bindings, ghost_in, expr in
+                let let_in  = ghost_let, binding, ghost_in, expr in
                 let expr    = ELetIn {value=let_in; region=Region.ghost}
     in kwd_fun, fresh, ghost_arrow, expr
   in Region.{region; value}
@@ -433,7 +432,7 @@ let rec unparse' = function
   EFun {value=_,var,arrow,expr; _} ->
     if var.region#is_ghost then
       match expr with
-        ELetIn {value = _,({pattern;eq;_},[]),_,expr; _} ->
+        ELetIn {value = _,{pattern;eq;_},_,expr; _} ->
           if eq#is_ghost then
             let patterns, sep, e = unparse' expr
             in Utils.nseq_cons pattern patterns, sep, e
@@ -485,9 +484,9 @@ let rec print_tokens ?(undo=false) {decl;eof} =
   Utils.nseq_iter (print_statement undo) decl; print_token eof "EOF"
 
 and print_statement undo = function
-  Let {value=kwd_let, let_bindings; _} ->
+  Let {value=kwd_let, let_binding; _} ->
     print_token kwd_let "let";
-    print_let_bindings undo let_bindings
+    print_let_binding undo let_binding
 | LetEntry {value=kwd_let_entry, let_binding; _} ->
     print_token kwd_let_entry "let%entry";
     print_let_binding undo let_binding
@@ -588,8 +587,6 @@ and print_terminator = function
   Some semi -> print_token semi ";"
 | None -> ()
 
-and print_let_bindings undo = print_nsepseq "and" (print_let_binding undo)
-
 and print_let_binding undo {pattern; lhs_type; eq; let_rhs} =
   print_pattern pattern;
   (match lhs_type with
@@ -706,10 +703,10 @@ and print_list_expr undo = function
     print_token op "::";
     print_expr undo arg2
 | List e -> print_injection (print_expr undo) e
-| Append {value=e1,append,e2; _} ->
+(*| Append {value=e1,append,e2; _} ->
     print_expr undo e1;
     print_token append "@";
-    print_expr undo e2
+    print_expr undo e2 *)
 
 and print_arith_expr undo = function
   Add {value={arg1;op;arg2}; _} ->
@@ -763,9 +760,9 @@ and print_comp_expr undo = function
     print_expr undo arg1; print_token op "="; print_expr undo arg2
 
 and print_record_expr undo e =
-  print_injection (print_field_assignment undo) e
+  print_injection (print_field_assign undo) e
 
-and print_field_assignment undo {value; _} =
+and print_field_assign undo {value; _} =
   let {field_name; assignment; field_expr} = value in
   print_var field_name;
   print_token assignment "=";
@@ -796,9 +793,9 @@ and print_case_clause undo {value; _} =
   print_token arrow "->";
   print_expr undo rhs
 
-and print_let_in undo (kwd_let, let_bindings, kwd_in, expr) =
+and print_let_in undo (kwd_let, let_binding, kwd_in, expr) =
   print_token kwd_let "let";
-  print_let_bindings undo let_bindings;
+  print_let_binding undo let_binding;
   print_token kwd_in "in";
   print_expr undo expr
 
@@ -819,3 +816,7 @@ and print_conditional undo {value; _} =
    print_token kwd_else "else";
    print_expr undo ifnot;
    print_token ghost ")"
+
+let rec unpar = function
+  EPar {value={inside=expr;_}; _} -> unpar expr
+| e -> e

src/parser/ligodity/AST.mli

@@ -118,15 +118,12 @@ and ast = t
 and eof = Region.t
 
 and declaration =
-  Let      of (kwd_let * let_bindings) reg       (* let p = e and ...       *)
+  Let      of (kwd_let * let_binding) reg        (* let p = e       *)
-| LetEntry of (kwd_let_entry * let_binding) reg  (* let%entry p = e and ... *)
+| LetEntry of (kwd_let_entry * let_binding) reg  (* let%entry p = e *)
 | TypeDecl of type_decl reg                      (* type ...        *)
 
 (* Non-recursive values *)
 
-and let_bindings =
-  (let_binding, kwd_and) Utils.nsepseq            (* p1 = e1 and p2 = e2 ... *)
-
 and let_binding = {                                  (* p = e   p : t = e *)
   pattern  : pattern;
   lhs_type : (colon * type_expr) option;
@@ -248,7 +245,7 @@ and closing =
 and list_expr =
   Cons   of cat bin_op reg                                   (* e1 :: e3      *)
 | List   of expr injection reg                               (* [e1; e2; ...] *)
-| Append of (expr * append * expr) reg                         (* e1  @ e2      *)
+(*| Append of (expr * append * expr) reg *)               (* e1  @ e2      *)
 
 and string_expr =
   Cat    of cat bin_op reg                                 (* e1  ^ e2      *)
@@ -305,9 +302,9 @@ and selection =
   FieldName of variable
 | Component of (string * Z.t) reg par reg
 
-and record_expr = field_assignment reg injection reg
+and record_expr = field_assign reg injection reg
 
-and field_assignment = {
+and field_assign = {
   field_name : field_name;
   assignment : equal;
   field_expr : expr
@@ -330,7 +327,7 @@ and 'a case_clause = {
   rhs     : 'a
 }
 
-and let_in = kwd_let * let_bindings * kwd_in * expr
+and let_in = kwd_let * let_binding * kwd_in * expr
 
 and fun_expr = (kwd_fun * variable * arrow * expr) reg
 
@@ -479,3 +476,11 @@ val print_tokens : ?undo:bool -> ast -> unit
 
 val region_of_pattern : pattern -> Region.t
 val region_of_expr    : expr -> Region.t
+
+(* Simplifications *)
+
+(* The call [unpar e] is the expression [e] if [e] is not
+   parenthesised, otherwise it is the non-parenthesised expressions it
+   contains. *)
+
+val unpar : expr -> expr

src/parser/ligodity/EvalOpt.ml

@@ -1,5 +1,14 @@
 (* Parsing the command-line option for the Mini-ML compiler/interpreter *)
 
+type options = {
+  input     : string option;
+  eval      : bool;
+  compile   : string option;
+  libs      : string list;
+  verbose   : Utils.String.Set.t;
+  raw_edits : bool
+}
+
 let abort msg =
   Utils.highlight (Printf.sprintf "Command-line error: %s" msg); exit 1
 
@@ -37,6 +46,8 @@ and verbose   = ref Utils.String.Set.empty
 and libs      = ref []
 and raw_edits = ref false
 
+let verb_str  = ref ""
+
 let set_opt var err =
   Some (fun x -> if !var = None then var := Some x else raise (Getopt.Error err))
 
@@ -69,11 +80,6 @@ let anonymous arg =
       None -> input := Some arg
   | Some _ -> abort (sprintf "Multiple inputs")
 
-(* Parsing the command-line options *)
-
-let () = try Getopt.parse_cmdline specs anonymous with
-           Getopt.Error msg -> abort msg
-
 (* Checking options *)
 
 let string_of convert = function
@@ -86,21 +92,18 @@ let string_of_path p =
 
 let quote s = Printf.sprintf "\"%s\"" s
 
-let verb_str =
-  let apply e a =
-    if a <> "" then Printf.sprintf "%s, %s" e a else e
-  in Utils.String.Set.fold apply !verbose ""
-
 let print_opt () =
   printf "COMMAND LINE\n";
   printf "input     = %s\n" (string_of quote !input);
   printf "compile   = %s\n" (string_of quote !compile);
   printf "eval      = %B\n" !eval;
   printf "raw_edits = %b\n" !raw_edits;
-  printf "verbose   = %s\n" verb_str;
+  printf "verbose   = %s\n" !verb_str;
   printf "libs      = %s\n" (string_of_path !libs)
 
-let () = if Utils.String.Set.mem "cmdline" !verbose then print_opt ()
+let check () =
+  let () =
+    if Utils.String.Set.mem "cmdline" !verbose then print_opt () in
 
   let input =
     match !input with
@@ -113,7 +116,7 @@ let input =
         then if   Sys.file_exists file_path
              then Some file_path
              else abort "Source file not found."
-      else abort "Source file lacks the extension .mml."
+        else abort "Source file lacks the extension .mml." in
 
   let compile =
     match !compile with
@@ -126,14 +129,14 @@ let compile =
     | Some compile' ->
         if   Filename.check_suffix compile' ".ml"
         then !compile
-      else abort "The extension of the target OCaml file is not .ml"
+        else abort "The extension of the target OCaml file is not .ml" in
 
   (* Exporting remaining options as non-mutable values *)
 
   let eval      = !eval
   and verbose   = !verbose
   and libs      = !libs
-and raw_edits = !raw_edits
+  and raw_edits = !raw_edits in
 
   let () =
   if Utils.String.Set.mem "cmdline" verbose then
@@ -143,6 +146,20 @@ let () =
       printf "compile   = %s\n" (string_of quote compile);
       printf "eval      = %B\n" eval;
       printf "raw_edits = %B\n" raw_edits;
-      printf "verbose   = %s\n" verb_str;
+      printf "verbose   = %s\n" !verb_str;
       printf "I         = %s\n" (string_of_path libs)
     end
+
+  in {input; eval; compile; libs; verbose; raw_edits}
+
+(* Parsing the command-line options *)
+
+let read () =
+  try
+    Getopt.parse_cmdline specs anonymous;
+    (verb_str :=
+       let apply e a =
+         if a <> "" then Printf.sprintf "%s, %s" e a else e
+       in Utils.String.Set.fold apply !verbose "");
+    check ()
+  with Getopt.Error msg -> abort msg

src/parser/ligodity/EvalOpt.mli

@@ -5,8 +5,6 @@
    [Some "-"] or [None], the source file is read from standard
    input. *)
 
-val input : string option
-
 (* The Mini-ML source file can be processed in two mutually exclusive
    manners: if the value [eval] is set to [true], the source is
    interpreted; if the value [compile] is not [None], the source is
@@ -14,11 +12,13 @@ val input : string option
    nothing is done with the source. Note: if [compile] is [Some "-"],
    the compiled code is sent to standard output. *)
 
-val eval      : bool
+type options = {
-val compile   : string option
+  input     : string option;
+  eval      : bool;
+  compile   : string option;
+  libs      : string list;
+  verbose   : Utils.String.Set.t;
+  raw_edits : bool
+}
 
-(*  TODO *)
+val read : unit -> options
-
-val libs      : string list
-val verbose   : Utils.String.Set.t
-val raw_edits : bool

src/parser/ligodity/Lexer.mli

@@ -17,20 +17,22 @@ exception Error of message Region.reg
    tokens to the given channel. If no logger is given to [get_token],
    no printing takes place while the lexer runs.
 
-     The call [reset ~file ~line buffer] modifies in-place the lexing
+     The call [reset ~file ~line ~offset buffer] modifies in-place the
-   buffer [buffer] so the lexing engine records that the file
+   lexing buffer [buffer] so the lexing engine records that the file
-   associated with [buffer] is named [file], and the current line is
+   associated with [buffer] is named [file], the current line is
-   [line]. This function is useful when lexing a file that has been
+   [line] and the offset on that line is [offset]. This function is
-   previously preprocessed by the C preprocessor, in which case the
+   useful when lexing a file that has been previously preprocessed by
-   argument [file] is the name of the file that was preprocessed,
+   the C preprocessor, in which case the argument [file] is the name
-   _not_ the preprocessed file (of which the user is not normally
+   of the file that was preprocessed, _not_ the preprocessed file (of
-   aware). By default, the [line] argument is [1].
+   which the user is not normally aware). By default, the [line]
+   argument is [1].
 *)
 
 type logger = out_channel * (out_channel -> Token.t -> unit)
 
 val get_token  : ?log:logger -> Lexing.lexbuf -> Token.t
-val reset     : file:string -> ?line:int -> Lexing.lexbuf -> unit
+val reset      : ?file:string -> ?line:int -> ?offset:int -> Lexing.lexbuf -> unit
+val reset_file : file:string ->  Lexing.lexbuf -> unit
 
 (* Debugging *)
 

src/parser/ligodity/Lexer.mll

@@ -78,7 +78,6 @@ let fail region value = raise (Error Region.{region; value})
 (* KEYWORDS *)
 
 let keywords = Token.[
-  "and",    Some And;
   "begin",  Some Begin;
   "else",   Some Else;
   "false",  Some False;
@@ -99,6 +98,7 @@ let keywords = Token.[
 
   (* Reserved *)
 
+  "and",         None;
   "as",          None;
   "asr",         None;
   "assert",      None;
@@ -152,12 +152,28 @@ let reset_file ~file buffer =
   let open Lexing in
   buffer.lex_curr_p <- {buffer.lex_curr_p with pos_fname = file}
 
-let reset_line lnum buffer =
+let reset_line ~line buffer =
   let open Lexing in
-  buffer.lex_curr_p <- {buffer.lex_curr_p with pos_lnum = lnum}
+  buffer.lex_curr_p <- {buffer.lex_curr_p with pos_lnum = line}
 
-let reset ~file ?(line=1) buffer =
+let reset_offset ~offset buffer =
-  reset_file ~file buffer; reset_line line buffer
+  assert (offset >= 0);
+  let open Lexing in
+  let bol = buffer.lex_curr_p.pos_bol in
+  buffer.lex_curr_p <- {buffer.lex_curr_p with pos_cnum = bol + offset }
+
+let reset ?file ?line ?offset buffer =
+  let () =
+    match file with
+      Some file -> reset_file ~file buffer
+    |      None -> () in
+  let () =
+    match line with
+      Some line -> reset_line ~line buffer
+    |      None -> () in
+  match offset with
+    Some offset -> reset_offset ~offset buffer
+  |        None -> ()
 
 (* Hack to roll back one lexeme in the current semantic action *)
 (*
@@ -222,7 +238,7 @@ rule scan = parse
 | "->"   { Token.ARROW    }
 | "::"   { Token.CONS     }
 | "^"    { Token.CAT      }
-| "@"    { Token.APPEND   }
+  (*| "@"    { Token.APPEND   }*)
 
 | "="    { Token.EQ       }
 | "<>"   { Token.NE       }
@@ -294,10 +310,54 @@ rule scan = parse
          let ()      = ignore thread
          in scan lexbuf }
 
+  (* Management of #include CPP directives
+
+    An input LIGO program may contain GNU CPP (C preprocessor)
+    directives, and the entry modules (named *Main.ml) run CPP on them
+    in traditional mode:
+
+    https://gcc.gnu.org/onlinedocs/cpp/Traditional-Mode.html
+
+      The main interest in using CPP is that it can stand for a poor
+    man's (flat) module system for LIGO thanks to #include
+    directives, and the traditional mode leaves the markup mostly
+    undisturbed.
+
+      Some of the #line resulting from processing #include directives
+    deal with system file headers and thus have to be ignored for our
+    purpose. Moreover, these #line directives may also carry some
+    additional flags:
+
+    https://gcc.gnu.org/onlinedocs/cpp/Preprocessor-Output.html
+
+    of which 1 and 2 indicate, respectively, the start of a new file
+    and the return from a file (after its inclusion has been
+    processed).
+  *)
+
+| '#' blank* ("line" blank+)? (integer as line) blank+
+    '"' (string as file) '"' {
+    let flags = scan_flags [] lexbuf in
+    let    () = ignore flags in
+    let line  = int_of_string line
+    and file  = Filename.basename file in
+    let    () = reset ~file ~line ~offset:0 lexbuf
+    in scan lexbuf
+  }
+
 | _ as c { let msg = sprintf "Invalid character '%s'."
                        (Char.escaped c)
            in error lexbuf msg }
 
+(* Scanning CPP #include flags *)
+
+and scan_flags acc = parse
+  blank+          { scan_flags acc lexbuf                  }
+| integer as code { let acc = int_of_string code :: acc
+                    in scan_flags acc lexbuf               }
+| nl              { Lexing.new_line lexbuf; List.rev acc   }
+| eof             { List.rev acc                           }
+
 (* Finishing a string *)
 
 and scan_string thread = parse
@@ -371,8 +431,8 @@ let iter action file_opt =
   try
     let cin, reset =
       match file_opt with
-        None | Some "-" -> stdin, fun ?(line=1) _ -> ignore line
+        None | Some "-" -> stdin, ignore
-      |       Some file -> open_in file, reset ~file in
+      |       Some file -> open_in file, reset_file ~file in
     let buffer = Lexing.from_channel cin in
     let rec iter () =
       try

src/parser/ligodity/LexerMain.ml

@@ -6,7 +6,11 @@ Printexc.record_backtrace true;;
 
 (* Running the lexer on the source *)
 
-if Utils.String.Set.mem "lexer" EvalOpt.verbose then
+let options = EvalOpt.read ();;
-  Lexer.trace EvalOpt.input
+
-else Lexer.iter (fun _lexbuf _out _token -> ()) EvalOpt.input
+open EvalOpt;;
+
+if Utils.String.Set.mem "lexer" options.verbose then
+  Lexer.trace options.input
+else Lexer.iter (fun _lexbuf _out _token -> ()) options.input
 ;;

src/parser/ligodity/ParToken.mly

@@ -18,7 +18,7 @@
 %token ARROW
 %token CONS
 %token CAT
-%token APPEND
+(*%token APPEND*)
 %token DOT
 
 %token COMMA
@@ -46,7 +46,7 @@
 %token <string * Z.t> Mtz
 %token <string * Z.t> Nat
 
-%token And
+(*%token And*)
 %token Begin
 %token Else
 %token End

src/parser/ligodity/Parser.mly

@@ -149,7 +149,7 @@ program:
   nseq(declaration) eof                           { {decl=$1; eof=$2} }
 
 declaration:
-  reg(kwd(Let)          let_bindings     {$1,$2})       {      Let $1 }
+  reg(kwd(Let)      let_binding  {$1,$2})               {      Let $1 }
 | reg(kwd(LetEntry) let_binding  {$1,$2})               { LetEntry $1 }
 | reg(type_decl)                                        { TypeDecl $1 }
 
@@ -234,9 +234,6 @@ field_decl:
 
 (* Non-recursive definitions *)
 
-let_bindings:
-  nsepseq(let_binding, kwd(And)) { $1 }
-
 let_binding:
   ident nseq(sub_irrefutable) type_annotation? eq expr {
     let let_rhs = EFun (norm $2 $4 $5) in
@@ -389,7 +386,7 @@ case_clause(right_expr):
   pattern arrow right_expr           { {pattern=$1; arrow=$2; rhs=$3} }
 
 let_expr(right_expr):
-  reg(kwd(Let) let_bindings kwd(In) right_expr {$1,$2,$3,$4}) {
+  reg(kwd(Let) let_binding kwd(In) right_expr {$1,$2,$3,$4}) {
     ELetIn $1 }
 
 fun_expr(right_expr):
@@ -447,14 +444,16 @@ ne_expr:
 
 cat_expr_level:
   reg(cat_expr)                                   {  EString (Cat $1) }
-| reg(append_expr)                                { EList (Append $1) }
+(*| reg(append_expr)                                { EList (Append $1) } *)
 | cons_expr_level                                 {                $1 }
 
 cat_expr:
   bin_op(cons_expr_level, sym(CAT), cat_expr_level)              { $1 }
 
+(*
 append_expr:
   cons_expr_level sym(APPEND) cat_expr_level               { $1,$2,$3 }
+ *)
 
 cons_expr_level:
   reg(cons_expr)                                    { EList (Cons $1) }

src/parser/ligodity/ParserMain.ml

@@ -4,10 +4,16 @@
 
 Printexc.record_backtrace true;;
 
+(* Reading the command-line options *)
+
+let options = EvalOpt.read ()
+
+open EvalOpt
+
 (* Path to the Mini-ML standard library *)
 
 let lib_path =
-  match EvalOpt.libs with
+  match options.libs with
       [] -> ""
   | libs -> let mk_I dir path = Printf.sprintf " -I %s%s" dir path
             in List.fold_right mk_I libs ""
@@ -15,9 +21,9 @@ let lib_path =
 (* Opening the input channel and setting the lexing engine *)
 
 let cin, reset =
-  match EvalOpt.input with
+  match options.input with
-    None | Some "-" -> stdin, fun ?(line=1) _buffer -> ignore line
+    None | Some "-" -> stdin, ignore
-  |       Some file -> open_in file, Lexer.reset ~file
+  |       Some file -> open_in file, Lexer.reset_file ~file
 
 let buffer = Lexing.from_channel cin
 let     () = reset buffer
@@ -25,14 +31,14 @@ let     () = reset buffer
 (* Tokeniser *)
 
 let tokeniser =
-  if Utils.String.Set.mem "lexer" EvalOpt.verbose then
+  if Utils.String.Set.mem "lexer" options.verbose then
     Lexer.get_token ~log:(stdout, Lexer.output_token buffer)
   else Lexer.get_token ?log:None
 
 let () =
   try
     let ast = Parser.program tokeniser buffer in
-    if Utils.String.Set.mem "unparsing" EvalOpt.verbose then
+    if Utils.String.Set.mem "unparsing" options.verbose then
       AST.print_tokens ~undo:true ast
     else () (* AST.print_tokens ast *)
   with

src/parser/ligodity/Token.ml

@@ -6,7 +6,7 @@ type t =
   ARROW
 | CONS
 | CAT
-| APPEND
+  (*| APPEND*)
 | MINUS
 | PLUS
 | SLASH
@@ -44,7 +44,7 @@ type t =
 
 (* Keywords *)
 
-| And
+(*| And*)
 | Begin
 | Else
 | End
@@ -87,7 +87,7 @@ let to_string = function
   ARROW    -> "->"
 | CONS     -> "::"
 | CAT      -> "^"
-| APPEND   -> "@"
+(*| APPEND   -> "@"*)
 | MINUS    -> "-"
 | PLUS     -> "+"
 | SLASH    -> "/"
@@ -119,7 +119,7 @@ let to_string = function
 | Mtz (lex,z) -> sprintf "Mtz %s (%s)" lex (Z.to_string z)
 | Str n    -> sprintf "Str \"%s\"" n
 | Bytes (lex,h) -> sprintf "Bytes %s (0x%s)" lex (Hex.to_string h)
-| And      -> "and"
+(*| And      -> "and"*)
 | Begin    -> "begin"
 | Else     -> "else"
 | End      -> "end"

src/parser/ligodity/Token.mli

@@ -6,7 +6,7 @@ type t =
   ARROW    (* "->" *)
 | CONS     (* "::" *)
 | CAT      (* "^"  *)
-| APPEND   (* "@"  *)
+  (*| APPEND   (* "@"  *)*)
 
   (* Arithmetics *)
 
@@ -60,7 +60,7 @@ type t =
 
   (* Keywords *)
 
-| And
+(*| And*)
 | Begin
 | Else
 | End