Refactoring of the parser and AST so "let" constructs bind

exactly one variable. (Unfinished)

Fixed minor error in error printing in Lexer.

Added test in ParseMain.ml on --verbose=parser.

src/parser/ligodity/AST.ml

@@ -116,7 +116,7 @@ and declaration =
 (* Non-recursive values *)
 
 and let_binding = {
-  pattern  : pattern;
+  variable : variable;
   lhs_type : (colon * type_expr) option;
   eq       : equal;
   let_rhs  : expr
@@ -320,11 +320,18 @@ and 'a case_clause = {
 
 and let_in = {
   kwd_let : kwd_let;
-  binding : let_binding;
+  binding : let_in_binding;
   kwd_in  : kwd_in;
   body    : expr
 }
 
+and let_in_binding = {
+  pattern  : pattern;
+  lhs_type : (colon * type_expr) option;
+  eq       : equal;
+  let_rhs  : expr
+}
+
 and fun_expr = {
   kwd_fun : kwd_fun;
   param   : variable;
@@ -345,16 +352,27 @@ and conditional = {
 
 let sprintf = Printf.sprintf
 
+let region_of_type_expr = function
+  TProd {region; _}
+| TSum {region; _}
+| TRecord {region; _}
+| TApp {region; _}
+| TFun {region; _}
+| TPar {region; _}
+| TAlias {region; _} -> region
+
+
 let region_of_list_pattern = function
   Sugar {region; _} | PCons {region; _} -> region
 
 let region_of_pattern = function
   PList p -> region_of_list_pattern p
 | PTuple {region;_} | PVar {region;_}
-| PUnit {region;_} | PInt {region;_} | PTrue region | PFalse region
+| PUnit {region;_} | PInt {region;_}
+| PTrue region | PFalse region
 | PString {region;_} | PWild region
-| PConstr {region; _} | PPar {region;_} | PRecord {region; _}
+| PConstr {region; _} | PPar {region;_}
-| PTyped {region; _} -> region
+| PRecord {region; _} | PTyped {region; _} -> region
 
 let region_of_bool_expr = function
   Or {region;_} | And {region;_}
@@ -472,9 +490,9 @@ and print_type_par {value={lpar;inside=t;rpar}; _} =
   print_type_expr t;
   print_token rpar ")"
 
-and print_projection Region.{value; _} =
+and print_projection node =
-  let {struct_name; selector; field_path} = value in
+  let {struct_name; selector; field_path} = node in
-  print_uident struct_name;
+  print_var struct_name;
   print_token selector ".";
   print_nsepseq "." print_selection field_path
 
@@ -532,7 +550,17 @@ and print_terminator = function
   Some semi -> print_token semi ";"
 | None -> ()
 
-and print_let_binding {pattern; lhs_type; eq; let_rhs} =
+and print_let_binding {variable; lhs_type; eq; let_rhs} =
+  print_var variable;
+  (match lhs_type with
+     None -> ()
+   | Some (colon, type_expr) ->
+       print_token colon ":";
+       print_type_expr type_expr);
+  (print_token eq "="; print_expr let_rhs)
+
+and print_let_in_binding (bind: let_in_binding) =
+  let {pattern; lhs_type; eq; let_rhs} : let_in_binding = bind in
   print_pattern pattern;
   (match lhs_type with
      None -> ()
@@ -603,7 +631,7 @@ and print_expr = function
 | ECall {value=f,l; _} ->
     print_expr f; Utils.nseq_iter print_expr l
 | EVar v -> print_var v
-| EProj p -> print_projection p
+| EProj p -> print_projection p.value
 | EUnit {value=lpar,rpar; _} ->
     print_token lpar "("; print_token rpar ")"
 | EBytes b -> print_bytes b
@@ -717,9 +745,10 @@ and print_case_clause {value; _} =
   print_token arrow "->";
   print_expr rhs
 
-and print_let_in {kwd_let; binding; kwd_in; body} =
+and print_let_in (bind: let_in) =
+  let {kwd_let; binding; kwd_in; body} = bind in
   print_token kwd_let "let";
-  print_let_binding binding;
+  print_let_in_binding binding;
   print_token kwd_in "in";
   print_expr body
 

src/parser/ligodity/AST.mli

@@ -118,14 +118,14 @@ and ast = t
 and eof = Region.t
 
 and declaration =
-  Let      of (kwd_let * let_binding) reg        (* let p = e       *)
+  Let      of (kwd_let * let_binding) reg        (* let x = e       *)
-| LetEntry of (kwd_let_entry * let_binding) reg  (* let%entry p = e *)
+| LetEntry of (kwd_let_entry * let_binding) reg  (* let%entry x = e *)
 | TypeDecl of type_decl reg                      (* type ...        *)
 
 (* Non-recursive values *)
 
 and let_binding = {                                  (* p = e   p : t = e *)
-  pattern  : pattern;
+  variable : variable;
   lhs_type : (colon * type_expr) option;
   eq       : equal;
   let_rhs  : expr
@@ -329,11 +329,18 @@ and 'a case_clause = {
 
 and let_in = {
   kwd_let : kwd_let;
-  binding : let_binding;
+  binding : let_in_binding;
   kwd_in  : kwd_in;
   body    : expr
 }
 
+and let_in_binding = {
+  pattern  : pattern;
+  lhs_type : (colon * type_expr) option;
+  eq       : equal;
+  let_rhs  : expr
+}
+
 and fun_expr = {
   kwd_fun : kwd_fun;
   param   : variable;
@@ -471,6 +478,7 @@ val print_tokens : (*?undo:bool ->*) ast -> unit
 
 val region_of_pattern   : pattern -> Region.t
 val region_of_expr      : expr -> Region.t
+val region_of_type_expr : type_expr -> Region.t
 
 (* Simplifications *)
 
@@ -479,3 +487,7 @@ val region_of_expr    : expr -> Region.t
    contains. *)
 
 val unpar : expr -> expr
+
+(* TODO *)
+
+val print_projection : projection -> unit

src/parser/ligodity/EvalOpt.ml

@@ -27,8 +27,7 @@ let help () =
   print_endline "                         (default: <input>.ml)";
   print_endline "  -e, --eval             Interpret <input>.mml or stdin";
   print_endline "      --raw-edits        Do not optimise translation edits";
-  print_endline "      --verbose=<phases> Colon-separated phases: cmdline, lexer,";
+  print_endline "      --verbose=<phases> Colon-separated phases: cmdline, lexer, parser";
-  print_endline "                         parser, unparsing, norm, eval";
   print_endline "      --version          Short commit hash on stdout";
   print_endline "  -h, --help             This help";
   exit 0

src/parser/ligodity/Lexer.mll

@@ -414,7 +414,7 @@ let get_token ?log =
 (* TODO: Move out (functor). See LIGO. *)
 
 let format_error ~(kind: string) Region.{region; value=msg} =
-  sprintf "%s error in %s:\n%s%!"
+  sprintf "%s error %s:\n%s%!"
     kind (region#to_string `Byte) msg
 
 let prerr ~(kind: string) msg =

src/parser/ligodity/Parser.mly

@@ -3,11 +3,104 @@
 
 open AST
 
+(* Rewrite "let pattern = e" as "let x = e;; let x1 = ...;; let x2 = ...;;" *)
+
+module VMap = Utils.String.Map
+
+let ghost_of value = Region.{region=ghost; value}
+let ghost = Region.ghost
+
+let mk_component rank =
+  let num = string_of_int rank, Z.of_int rank in
+  let par = {lpar=ghost; inside = ghost_of num; rpar=ghost}
+  in Component (ghost_of par)
+
+let rec mk_field_path (rank, tail) =
+  let head = mk_component rank in
+  match tail with
+        [] -> head, []
+  | hd::tl -> mk_field_path (hd,tl) |> Utils.nsepseq_cons head ghost
+
+let mk_projection (fresh : variable) (path : int Utils.nseq) =
+  {struct_name = fresh;
+   selector    = ghost;
+   field_path  = Utils.nsepseq_rev (mk_field_path path)}
+
+let rec sub_rec fresh path (map, rank) pattern =
+  let path' = Utils.nseq_cons rank path in
+  let map'  = split fresh map path' pattern
+  in map', rank+1
+
+and split fresh map path = function
+  PTuple t -> let apply = sub_rec fresh path in
+             Utils.nsepseq_foldl apply (map,1) t.value |> fst
+| PPar p   -> split fresh map path p.value.inside
+| PVar v   -> if VMap.mem v.value map
+             then let err = Region.{value="Non-linear pattern.";
+                                    region=v.region}
+                  in (Lexer.prerr ~kind:"Syntactical" err; exit 1)
+             else VMap.add v.value (mk_projection fresh path) map
+| PWild _  -> map
+| PUnit _  -> map (* TODO *)
+| PConstr {region; _}
+| PTyped {region; _} ->
+    let err = Region.{value="Not implemented yet."; region}
+    in (Lexer.prerr ~kind:"Syntactical" err; exit 1)
+| _ -> assert false
+
+let rec split_pattern = function
+  PPar p -> split_pattern p.value.inside
+| PTyped {value=p; _} ->
+    let var', type', map = split_pattern p.pattern in
+    (match type' with
+       None -> var', Some p.type_expr, map
+     | Some t when t = p.type_expr -> var', Some t, map (* hack *)
+     | Some t ->
+         let reg = AST.region_of_type_expr t in
+         let reg = reg#to_string `Byte in
+         let value =
+           Printf.sprintf "Unification with %s is not\
+                           implemented." reg in
+         let region = AST.region_of_type_expr p.type_expr in
+         let err = Region.{value; region} in
+         (Lexer.prerr ~kind:"Syntactical" err; exit 1))
+| PConstr {region; _} (* TODO *)
+| PRecord {region; _} ->
+    let err = Region.{value="Not implemented yet."; region}
+    in (Lexer.prerr ~kind:"Syntactical" err; exit 1)
+| PUnit _ ->
+    let fresh = Utils.gen_sym () |> ghost_of in
+    let unit = TAlias (ghost_of "unit")
+    in fresh, Some unit, VMap.empty
+| PVar v -> v, None, VMap.empty
+| PWild _ -> Utils.gen_sym () |> ghost_of, None, VMap.empty
+| PInt {region;_} | PTrue region
+| PFalse region | PString {region;_}
+| PList Sugar {region; _} | PList PCons {region; _} ->
+    let err = Region.{value="Incomplete pattern."; region}
+    in (Lexer.prerr ~kind:"Syntactical" err; exit 1)
+| PTuple t ->
+    let fresh = Utils.gen_sym () |> ghost_of
+    and init = VMap.empty, 1 in
+    let apply (map, rank) pattern =
+      split fresh map (rank,[]) pattern, rank+1 in
+    let map = Utils.nsepseq_foldl apply init t.value |> fst
+    in fresh, None, map
+
+let mk_let_bindings =
+  let apply var proj let_bindings =
+    let new_bind : let_binding = {
+      variable = ghost_of var;
+      lhs_type = None;
+      eq = ghost;
+      let_rhs = EProj (ghost_of proj)} in
+    let new_let = Let (ghost_of (ghost, new_bind))
+    in Utils.nseq_cons new_let let_bindings
+  in VMap.fold apply
+
 (* We rewrite "fun p -> e" into "fun x -> match x with p -> e" *)
 
 let norm_fun_expr patterns expr =
-  let ghost_of value = Region.{region=ghost; value} in
-  let ghost = Region.ghost in
   let apply pattern expr =
     match pattern with
       PVar var ->
@@ -15,8 +108,8 @@ let norm_fun_expr patterns expr =
           kwd_fun = ghost;
           param   = var;
           arrow   = ghost;
-          body    = expr} in
+          body    = expr}
-        EFun (ghost_of fun_expr)
+        in EFun (ghost_of fun_expr)
     | _ -> let fresh = Utils.gen_sym () |> ghost_of in
           let clause = {pattern; arrow=ghost; rhs=expr} in
           let clause = ghost_of clause in
@@ -37,17 +130,6 @@ let norm_fun_expr patterns expr =
           in EFun (ghost_of fun_expr)
   in Utils.nseq_foldr apply patterns expr
 
-(*
-let norm_fun_expr patterns expr =
-  let apply pattern expr =
-    let fun_expr = {
-      kwd_fun = Region.ghost;
-      param   = pattern;
-      arrow   = Region.ghost;
-      body    = expr} in
-    EFun {region=Region.ghost; value=fun_expr}
-  in Utils.nseq_foldr apply patterns expr
- *)
 (* END HEADER *)
 %}
 
@@ -172,7 +254,7 @@ sepseq(item,sep):
 type_name   : ident  { $1 }
 field_name  : ident  { $1 }
 module_name : constr { $1 }
-struct_name : Ident { $1 }
+struct_name : ident  { $1 }
 
 (* Non-empty comma-separated values (at least two values) *)
 
@@ -191,12 +273,17 @@ list_of(item):
 (* Main *)
 
 program:
-  nseq(declaration) eof                           { {decl=$1; eof=$2} }
+  declarations eof               { {decl = Utils.nseq_rev $1; eof=$2} }
+
+declarations:
+  declaration                                                    { $1 }
+| declaration declarations {
+    Utils.(nseq_foldl (fun x y -> nseq_cons y x) $2 $1)                  }
 
 declaration:
-  reg(kwd(Let)      let_binding  {$1,$2})               {      Let $1 }
+  reg(kwd(LetEntry) entry_binding {$1,$2})          { LetEntry $1, [] }
-| reg(kwd(LetEntry) let_binding  {$1,$2})               { LetEntry $1 }
+| reg(type_decl)                                    { TypeDecl $1, [] }
-| reg(type_decl)                                        { TypeDecl $1 }
+| let_declaration                                   {              $1 }
 
 (* Type declarations *)
 
@@ -227,8 +314,8 @@ core_type:
     let arg, constr = $1.value in
     let Region.{value=arg_val; _} = arg in
     let lpar, rpar = Region.ghost, Region.ghost in
-    let arg_val = {lpar; inside=arg_val,[]; rpar} in
+    let value = {lpar; inside=arg_val,[]; rpar} in
-    let arg = {arg with value=arg_val} in
+    let arg = {arg with value} in
     TApp Region.{$1 with value = constr, arg}
   }
 | reg(type_tuple type_constr {$1,$2}) {
@@ -236,8 +323,8 @@ core_type:
     TApp Region.{$1 with value = constr, arg}
   }
 | par(cartesian) {
-    let Region.{region; value={lpar; inside=prod; rpar}} = $1 in
+    let Region.{value={inside=prod; _}; _} = $1 in
-    TPar Region.{region; value={lpar; inside = TProd prod; rpar}} }
+    TPar {$1 with value={$1.value with inside = TProd prod}} }
 
 type_projection:
   type_name {
@@ -277,15 +364,46 @@ field_decl:
   field_name colon type_expr {
     {field_name=$1; colon=$2; field_type=$3} }
 
-(* Non-recursive definitions *)
+(* Entry points *)
+
+entry_binding:
+  ident nseq(sub_irrefutable) type_annotation? eq expr {
+    let let_rhs = norm_fun_expr $2 $5 in
+    {variable = $1; lhs_type=$3; eq=$4; let_rhs} : let_binding
+  }
+| ident type_annotation? eq fun_expr(expr) {
+    {variable = $1; lhs_type=$2; eq=$3; let_rhs=$4} : let_binding }
+
+(* Top-level non-recursive definitions *)
+
+let_declaration:
+  reg(kwd(Let) let_binding {$1,$2}) {
+    let kwd_let, (binding, map) = $1.value in
+    let let0 = Let {$1 with value = kwd_let, binding}
+    in mk_let_bindings map (let0,[])
+  }
 
 let_binding:
   ident nseq(sub_irrefutable) type_annotation? eq expr {
     let let_rhs = norm_fun_expr $2 $5 in
-    {pattern = PVar $1; lhs_type=$3; eq = Region.ghost; let_rhs}
+    let map = VMap.empty in
+    ({variable=$1; lhs_type=$3; eq=$4; let_rhs}: let_binding), map
   }
 | irrefutable type_annotation? eq expr {
-    {pattern=$1; lhs_type=$2; eq=$3; let_rhs=$4} }
+    let variable, type_opt, map = split_pattern $1 in
+    ({variable; lhs_type=$2; eq=$3; let_rhs=$4}: let_binding), map }
+
+(* TODO *)
+
+let_in_binding:
+  ident nseq(sub_irrefutable) type_annotation? eq expr {
+    let let_rhs = norm_fun_expr $2 $5 in
+    {pattern = PVar $1; lhs_type=$3; eq=$4; let_rhs}: let_in_binding
+  }
+| irrefutable type_annotation? eq expr {
+    let variable, type_opt, map = split_pattern $1 in
+    {pattern = PVar variable; lhs_type=$2; eq=$3; let_rhs=$4}
+    : let_in_binding }
 
 type_annotation:
   colon type_expr { $1,$2 }
@@ -303,8 +421,7 @@ sub_irrefutable:
 | par(closed_irrefutable)                                {    PPar $1 }
 
 closed_irrefutable:
-  reg(tuple(sub_irrefutable))                            {  PTuple $1 }
+  irrefutable                                            {         $1 }
-| sub_irrefutable                                        {         $1 }
 | reg(constr_pattern)                                    { PConstr $1 }
 | reg(typed_pattern)                                     {  PTyped $1 }
 
@@ -384,11 +501,10 @@ conditional(right_expr):
 
 if_then(right_expr):
   kwd(If) expr kwd(Then) right_expr {
-    let open Region in
     let the_unit = ghost, ghost in
     let ifnot = EUnit {region=ghost; value=the_unit} in
     {kwd_if=$1; test=$2; kwd_then=$3; ifso=$4;
-     kwd_else=Region.ghost; ifnot} }
+     kwd_else=ghost; ifnot} }
 
 if_then_else(right_expr):
   kwd(If) expr kwd(Then) closed_if kwd(Else) right_expr {
@@ -414,13 +530,12 @@ match_expr(right_expr):
      closing = End Region.ghost}
   }
 | kwd(MatchNat) expr kwd(With) vbar? reg(cases(right_expr)) {
-    let open Region in
     let cases = Utils.nsepseq_rev $5.value in
     let cast = EVar {region=ghost; value="assert_pos"} in
     let cast = ECall {region=ghost; value=cast,($2,[])} in
     {kwd_match = $1; expr = cast; opening = With $3;
      lead_vbar = $4; cases = {$5 with value=cases};
-     closing = End Region.ghost} }
+     closing = End ghost} }
 
 cases(right_expr):
   reg(case_clause(right_expr))                       { $1, [] }
@@ -431,7 +546,7 @@ case_clause(right_expr):
   pattern arrow right_expr           { {pattern=$1; arrow=$2; rhs=$3} }
 
 let_expr(right_expr):
-  reg(kwd(Let) let_binding kwd(In) right_expr {$1,$2,$3,$4}) {
+  reg(kwd(Let) let_in_binding kwd(In) right_expr {$1,$2,$3,$4}) {
     let Region.{region; value = kwd_let, binding, kwd_in, body} = $1 in
     let let_in = {kwd_let; binding; kwd_in; body}
     in ELetIn {region; value=let_in} }
@@ -576,7 +691,7 @@ module_field:
   module_name dot field_name              { $1.value ^ "." ^ $3.value }
 
 projection:
-  reg(struct_name) dot nsepseq(selection,dot) {
+  struct_name dot nsepseq(selection,dot) {
     {struct_name = $1; selector = $2; field_path = $3}
   }
 | reg(module_name dot field_name {$1,$3})

src/parser/ligodity/ParserMain.ml

@@ -38,7 +38,8 @@ let tokeniser =
 let () =
   try
     let ast = Parser.program tokeniser buffer in
-    AST.print_tokens ast
+    if Utils.String.Set.mem "parser" options.verbose
+    then AST.print_tokens ast
   with
     Lexer.Error diag ->
       close_in cin; Lexer.prerr ~kind:"Lexical" diag

src/parser/ligodity/Utils.ml

@@ -141,7 +141,7 @@ end
 
 let gen_sym =
   let counter = ref 0 in
-  fun () -> incr counter; "v" ^ string_of_int !counter
+  fun () -> incr counter; "#" ^ string_of_int !counter
 
 (* General tracing function *)
 

src/parser/ligodity/Utils.mli

@@ -25,73 +25,73 @@ type ('a,'sep)  sepseq = ('a,'sep) nsepseq option
 
 (* Consing *)
 
-val nseq_cons:    'a -> 'a nseq -> 'a nseq
+val nseq_cons    : 'a -> 'a nseq -> 'a nseq
-val nsepseq_cons: 'a -> 'sep -> ('a,'sep) nsepseq -> ('a,'sep) nsepseq
+val nsepseq_cons : 'a -> 'sep -> ('a,'sep) nsepseq -> ('a,'sep) nsepseq
-val sepseq_cons:  'a -> 'sep -> ('a,'sep)  sepseq -> ('a,'sep) nsepseq
+val sepseq_cons  : 'a -> 'sep -> ('a,'sep)  sepseq -> ('a,'sep) nsepseq
 
 (* Reversing *)
 
-val nseq_rev:    'a nseq -> 'a nseq
+val nseq_rev    : 'a nseq -> 'a nseq
-val nsepseq_rev: ('a,'sep) nsepseq -> ('a,'sep) nsepseq
+val nsepseq_rev : ('a,'sep) nsepseq -> ('a,'sep) nsepseq
-val sepseq_rev:  ('a,'sep)  sepseq -> ('a,'sep)  sepseq
+val sepseq_rev  : ('a,'sep)  sepseq -> ('a,'sep)  sepseq
 
 (* Rightwards iterators *)
 
-val nseq_foldl:    ('a -> 'b -> 'a) -> 'a ->        'b nseq -> 'a
+val nseq_foldl    : ('a -> 'b -> 'a) -> 'a ->        'b nseq -> 'a
-val nsepseq_foldl: ('a -> 'b -> 'a) -> 'a -> ('b,'c) nsepseq -> 'a
+val nsepseq_foldl : ('a -> 'b -> 'a) -> 'a -> ('b,'c) nsepseq -> 'a
-val sepseq_foldl:  ('a -> 'b -> 'a) -> 'a -> ('b,'c)  sepseq -> 'a
+val sepseq_foldl  : ('a -> 'b -> 'a) -> 'a -> ('b,'c)  sepseq -> 'a
 
-val nseq_iter:     ('a -> unit) ->        'a nseq -> unit
+val nseq_iter     : ('a -> unit) ->        'a nseq -> unit
-val nsepseq_iter:  ('a -> unit) -> ('a,'b) nsepseq -> unit
+val nsepseq_iter  : ('a -> unit) -> ('a,'b) nsepseq -> unit
-val sepseq_iter:   ('a -> unit) -> ('a,'b)  sepseq -> unit
+val sepseq_iter   : ('a -> unit) -> ('a,'b)  sepseq -> unit
 
 (* Leftwards iterators *)
 
-val nseq_foldr:    ('a -> 'b -> 'b) ->        'a nseq -> 'b -> 'b
+val nseq_foldr    : ('a -> 'b -> 'b) ->        'a nseq -> 'b -> 'b
-val nsepseq_foldr: ('a -> 'b -> 'b) -> ('a,'c) nsepseq -> 'b -> 'b
+val nsepseq_foldr : ('a -> 'b -> 'b) -> ('a,'c) nsepseq -> 'b -> 'b
-val sepseq_foldr:  ('a -> 'b -> 'b) -> ('a,'c)  sepseq -> 'b -> 'b
+val sepseq_foldr  : ('a -> 'b -> 'b) -> ('a,'c)  sepseq -> 'b -> 'b
 
 (* Conversions to lists *)
 
-val nseq_to_list:           'a nseq -> 'a list
+val nseq_to_list    : 'a nseq -> 'a list
-val nsepseq_to_list: ('a,'b) nsepseq -> 'a list
+val nsepseq_to_list : ('a,'b) nsepseq -> 'a list
-val sepseq_to_list:  ('a,'b)  sepseq -> 'a list
+val sepseq_to_list  : ('a,'b)  sepseq -> 'a list
 
 (* Effectful symbol generator *)
 
-val gen_sym: unit -> string
+val gen_sym : unit -> string
 
 (* General tracing function *)
 
-val trace: string -> out_channel option -> unit
+val trace : string -> out_channel option -> unit
 
 (* Printing a string in red to standard error *)
 
-val highlight: string -> unit
+val highlight : string -> unit
 
 (* Working with optional values *)
 
 module Option:
   sig
-    val apply: ('a -> 'b) -> 'a option -> 'b option
+    val apply     : ('a -> 'b) -> 'a option -> 'b option
-    val rev_apply: ('a -> 'a) option -> 'a -> 'a
+    val rev_apply : ('a -> 'a) option -> 'a -> 'a
-    val to_string: string option -> string
+    val to_string : string option -> string
   end
 
 (* An extension to the standard module [String] *)
 
-module String:
+module String :
   sig
     include module type of String
-    module Map: Map.S with type key = t
+    module Map : Map.S with type key = t
-    module Set: Set.S with type elt = t
+    module Set : Set.S with type elt = t
   end
 
 (* Integer maps *)
 
-module Int:
+module Int :
   sig
     type t = int
-    module Map: Map.S with type key = t
+    module Map : Map.S with type key = t
-    module Set: Set.S with type elt = t
+    module Set : Set.S with type elt = t
   end

src/parser/ligodity/Version.ml

@@ -1 +0,0 @@
-let version = "UNKNOWN"