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WebSharper compiler generates incredibly long code.

I wanted to call attention to what seems to be a bug. Or maybe I'm missing an important compiler option because this does not happen in try.websharper.com.

I use this code to compile from F# to javascript:

    let translate2JSR_ (assemblyName: string) assemblies =
        Rop.flow {
            do!  Rop.tryProtection()
            use  errors = new System.IO.StringWriter()
            let  loader =  WebSharper.Compiler.FrontEnd.Loader.Create (IntelliFactory.Core.AssemblyResolution.AssemblyResolver.Create()) (fprintfn errors "%O")
            let  options =
                 { WebSharper.Compiler.FrontEnd.Options.Default with
                     ErrorLimit = 5000
                     References =
                         assemblies
                         |> List.map loader.LoadFile }
            let  compiler =  WebSharper.Compiler.FrontEnd.Prepare options (fprintfn errors "%O")
            let! js = assemblyName |> loader.LoadFile |> compiler.Compile |> Rop.fromOption (ErrWebSharperCompiler <| errors.ToString())
            return js
        }

    open Microsoft.FSharp.Compiler.SimpleSourceCodeServices
    let compileR_ (code:string) assemblies inMemory = 
        Rop.flow {
            do!  Rop.tryProtection()
            let fn        = System.IO.Path.GetTempFileName()
            let src       = System.IO.Path.ChangeExtension(fn, ".fs")
            let code2     = code.Split([| "\r\n"; "\n" ; "\r" |], System.StringSplitOptions.None)
                            |> Seq.map(fun line -> if line.StartsWith("#r")
                                                   then ("//" + line, line)
                                                   else (line       , ""  ))
            System.IO.File.WriteAllText(src, code2 |> Seq.map fst |> String.concat "\r\n" )
            printfn "%s:" src
            printfn "%s" code
            let scs       = SimpleSourceCodeServices()
            let dll       = System.IO.Path.ChangeExtension(src, ".dll")
            let options   = assemblies |> Seq.collect(fun e -> ["-r"; e]) |> Seq.toArray 
                            |> Array.append [|  "IGNOREDfsc.exe"
                                                "--noframework"
                                                "--optimize-"
                                                "--tailcalls-" 
                                                "--target:library"
                                                "--warn:3"
                                                "--warnaserror:76"
                                                "--vserrors"
                                                "--LCID:1033" 
                                                "--utf8output" 
                                                "--fullpaths"
                                                "--flaterrors" 
                                                "--subsystemversion:6.00"
                                                "--highentropyva+"
                                                "-o"; dll
                                                "-a"; src |]
            let errors, exitCode, assemblyO =
                if inMemory
                then                        scs.CompileToDynamicAssembly (options, None)
                else let errors, exitCode = scs.Compile options
                     errors, exitCode, None
            System.IO.File.Delete src
            let result = if exitCode = 0 
                         then (Some dll, assemblyO) |> Rop.succeed
                         else Rop.fail (errors |> Seq.map (sprintf "%A") |> String.concat "\n" |> ErrFSharpCompiler)
            return! result
        }

when the following function compiles the result has more than 9000 lines...

    let handleKey (model: Model) (processMessages: Message -> unit) ev =
        match ev?key |> unbox with
        | "Esc"                              -> SetSelection(None, None) |> processMessages
        | "ArrowUp"     when not ev?shiftKey 
                        && not ev?ctrlKey 
                        && not ev?altKey   -> getPriorId1  model |> Option.iter (fun id -> SetSelection(Some(id, id), getCurrentCol1 model |> double) |> processMessages)
        | "ArrowDown"   when not ev?shiftKey                
                        && not ev?ctrlKey                 
                        && not ev?altKey   -> getNextId1   model |> Option.iter (fun id -> SetSelection(Some(id, id), getCurrentCol1 model |> double) |> processMessages)
        | "ArrowLeft"   when not ev?shiftKey 
                        && not ev?ctrlKey 
                        && not ev?altKey   -> getPriorCol1 model |> Option.iter (fun i  -> SetSelection(getCurrentId1 model |> double, Some(i , i )) |> processMessages)
        | "ArrowRight"  when not ev?shiftKey 
                        && not ev?ctrlKey 
                        && not ev?altKey   -> getNextCol1  model |> Option.iter (fun i  -> SetSelection(getCurrentId1 model |> double, Some(i , i )) |> processMessages)
        | "ArrowUp"     when     ev?shiftKey 
                        && not ev?ctrlKey 
                        && not ev?altKey   -> getPriorId1  model |> Option.iter (fun id -> getCurrentCol1 model |> Option.iter (fun c  -> EndSelection(Some id, c) |> processMessages))
        | "ArrowDown"   when     ev?shiftKey                                                                                           
                        && not ev?ctrlKey                                                                                            
                        && not ev?altKey   -> getNextId1   model |> Option.iter (fun id -> getCurrentCol1 model |> Option.iter (fun c  -> EndSelection(Some id, c) |> processMessages))
        | "ArrowLeft"   when     ev?shiftKey 
                        && not ev?ctrlKey 
                        && not ev?altKey   -> getPriorCol1 model |> Option.iter (fun c  -> getCurrentId1 model  |> Option.iter (fun id -> EndSelection(Some id, c) |> processMessages))
        | "ArrowRight"  when     ev?shiftKey 
                        && not ev?ctrlKey 
                        && not ev?altKey   -> getNextCol1  model |> Option.iter (fun c  -> getCurrentId1 model  |> Option.iter (fun id -> EndSelection(Some id, c) |> processMessages))
        | _                                -> ()

The string "ArrowDown" shows up only twice in the original code but it shows up 34 times in the resulting JS. This is just the first 1000 lines:

  handleKey:function(model,processMessages,ev)
    {
     var value,_,_1,_2,action,option,_3,_4,action1,option1,_5,_6,action2,option2,_7,_8,action3,option3,_9,_a,action4,option5,_b,_c,action6,option6,_d,_e,action7,option7,_f,_10,action8,option8,_11,_12,action9,option9,_13,_14,actiona,optiona,_15,_16,actionb,optionb,_17,_18,actionc,optionc,_19,_1a,actiond,optiond,_1b,_1c,actione,optione,_1d,_1e,actionf,optionf,_1f,_20,action10,option10,_21,_22,action11,option11,_23,_24,action12,option12,_25,_26,action13,option13,_27,_28,action14,option14,_29,_2a,action15,option15,_2b,_2c,action16,option16,_2d,_2e,action17,option17,_2f,_30,action18,option18,_31,_32,action19,option19,_33,_34,action1a,option1a,_35,_36,action1b,option1b,_37,_38,action1c,option1c,_39,_3a,action1d,option1d,_3b,_3c,action1e,option1e,_3d,_3e,action1f,option1f,_3f,_40,action20,option20,_41,_42,action21,option21,_43,_44,action22,option22,_45,_46,action23,option23,_47,_48,action24,option24,_49,_4a,action25,option25,_4b,_4c,action26,option26,_4d,_4e,action27,option27,_4f,_50,action28,option28,_51,_52,action29,option29,_53,_54,action2a,option2a,_55,_56,action2b,option2b,_57,_58,action2c,option2c,_59,_5a,action2d,option2d,_5b,_5c,action2e,option2e,_5d,_5e,action2f,option2f,_5f,_60,action30,option30,_61,_62,action31,option31,_63,_64,action32,option32,_65,_66,action33,option33,_67,_68,action34,option34,_69,_6a,action35,option35,_6b,_6c,action36,option36,_6d,_6e,action37,option37,_6f,_70,action38,option38,_71,_72,action39,option39,_73,_74,action3a,option3a,_75,_76,action3b,option3b,_77,_78,action3c,option3c,_79,_7a,action3d,option3d,_7b,_7c,action3e,option3e,_7d,_7e,action3f,option3f,_7f,_80,action40,option40,_81,_82,action41,option41,_83,_84,action42,option42,_85,_86,action43,option43,_87,_88,action44,option44,_89,_8a,action45,option45,_8b,_8c,action46,option46,_8d,_8e,action47,option47,_8f,_90,action48,option48,_91,_92,action49,option49,_93,_94,action4a,option4a,_95,_96,action4b,option4b,_97,_98,action4c,option4c,_99,_9a,action4d,option4d,_9b,_9c,action4e,option4e,_9d,_9e,action4f,option4f,_9f,_a0,action50,option50,_a1,_a2,action51,option51,_a3,_a4,action52,option52,_a5,_a6,action53,option53,_a7,_a8,action54,option54,_a9,_aa,action55,option55,_ab,_ac,action56,option56,_ad,_ae,action57,option57,_af,_b0,action58,option58,_b1,_b2,action59,option59,_b3,_b4,action5a,option5a,_b5,_b6,action5b,option5b,_b7,_b8,action5c,option5c,_b9,_ba,action5d,option5d,_bb,_bc,action5e,option5e,_bd,_be,action5f,option5f,_bf,_c0,action60,option60,_c1,_c2,action61,option61,_c3,_c4,action62,option62,_c5,_c6,action63,option63,_c7,_c8,action64,option64,_c9,_ca,action65,option65,_cb,_cc,action66,option66,_cd,_ce,action67,option67,_cf,_d0,action68,option68,_d1,_d2,action69,option69,_d3,_d4,action6a,option6a,_d5,_d6,action6b,option6b,_d7,_d8,action6c,option6c,_d9,_da,action6d,option6d,_db,_dc,action6e,option6e,_dd,_de,action6f,option6f,_df,_e0,action70,option70,_e1,_e2,action71,option71,_e3,_e4,action72,option72,_e5,_e6,action73,option73,_e7,_e8,action74,option74,_e9,_ea,action75,option75,_eb,_ec,action76,option76,_ed,_ee,action77,option77,_ef,_f0,action78,option78,_f1,_f2,action79,option79,_f3,_f4,action7a,option7a,_f5,_f6,action7b,option7b,_f7,_f8,action7c,option7c,_f9,_fa,action7d,option7d,_fb,_fc,action7e,option7e,_fd,_fe,action7f,option7f,_ff,_100,action80,option80,_101,_102,action81,option81,_103,_104,action82,option82,_105,_106,action83,option83,_107,_108,action84,option84,_109,_10a,action85,option85,_10b,_10c,action86,option86,_10d,_10e,action87,option87,_10f,_110,action88,option88,_111,_112,action89,option89,_113,_114,action8a,option8a,_115,_116,action8b,option8b,_117,_118,action8c,option8c,_119,_11a,action8d,option8d,_11b,_11c,action8e,option8e,_11d,_11e,action8f,option8f,_11f,_120,action90,option90,_121,_122,action91,option91,_123,_124,action92,option92,_125,_126,action93,option93,_127,_128,action94,option94,_129,_12a,action95,option95,_12b,_12c,action96,option96,_12d,_12e,action97,option97,_12f,_130,action98,option98,_131,_132,action99,option99,_133,_134,action9a,option9a,_135,_136,action9b,option9b,_137,_138,action9c,option9c,_139,_13a,action9d,option9d,_13b,_13c,action9e,option9e,_13d,_13e,action9f,option9f,_13f,_140,actiona0,optiona0,_141,_142,actiona1,optiona1,_143,_144,actiona2,optiona2,_145,_146,actiona3,optiona3,_147,_148,actiona4,optiona4,_149,_14a,actiona5,optiona5,_14b,_14c,actiona6,optiona6,_14d,_14e,actiona7,optiona7,_14f,_150,actiona8,optiona8,_151,_152,actiona9,optiona9,_153,_154,actionaa,optionaa,_155,_156,actionab,optionab,_157,_158,actionac,optionac,_159,_15a,actionad,optionad,_15b,_15c,actionae,optionae,_15d,_15e,actionaf,optionaf,_15f,_160,actionb0,optionb0,_161,_162,actionb1,optionb1,_163,_164,actionb2,optionb2,_165,_166,actionb3,optionb3,_167,_168,actionb4,optionb4,_169,_16a,actionb5,optionb5,_16b,_16c,actionb6,optionb6,_16d,_16e,actionb7,optionb7,_16f,_170,actionb8,optionb8,_171,_172,actionb9,optionb9,_173,_174,actionba,optionba,_175,_176,actionbb,optionbb,_177,_178,actionbc,optionbc,_179,_17a,actionbd,optionbd,_17b,_17c,actionbe,optionbe,_17d,_17e,actionbf,optionbf,_17f,_180,actionc0,optionc0,_181,_182,actionc1,optionc1,_183,_184,actionc2,optionc2,_185,_186,actionc3,optionc3,_187,_188,actionc4,optionc4,_189,_18a,actionc5,optionc5,_18b,_18c,actionc6,optionc6,_18d,_18e,actionc7,optionc7,_18f,_190,actionc8,optionc8,_191,_192,actionc9,optionc9,_193,_194,actionca,optionca,_195,_196,actioncb,optioncb,_197,_198,actioncc,optioncc,_199,_19a,actioncd,optioncd,_19b,_19c,actionce,optionce,_19d,_19e,actioncf,optioncf,_19f,_1a0,actiond0,optiond0,_1a1,_1a2,actiond1,optiond1,_1a3,_1a4,actiond2,optiond2,_1a5,_1a6,actiond3,optiond3,_1a7,_1a8,actiond4,optiond4,_1a9,_1aa,actiond5,optiond5,_1ab,_1ac,actiond6,optiond6,_1ad,_1ae,actiond7,optiond7,_1af,_1b0,actiond8,optiond8,_1b1,_1b2,actiond9,optiond9,_1b3,_1b4,actionda,optionda,_1b5,_1b6,actiondb,optiondb,_1b7,_1b8,actiondc,optiondc,_1b9,_1ba,actiondd,optiondd,_1bb,_1bc,actionde,optionde,_1bd,_1be,actiondf,optiondf,_1bf,_1c0,actione0,optione0,_1c1,_1c2,actione1,optione1,_1c3,_1c4,actione2,optione2,_1c5,_1c6,actione3,optione3,_1c7,_1c8,actione4,optione4,_1c9,_1ca,actione5,optione5,_1cb,_1cc,actione6,optione6,_1cd,_1ce,actione7,optione7,_1cf,_1d0,actione8,optione8,_1d1,_1d2,actione9,optione9,_1d3,_1d4,actionea,optionea,_1d5,_1d6,actioneb,optioneb,_1d7,_1d8,actionec,optionec,_1d9,_1da,actioned,optioned,_1db,_1dc,actionee,optionee,_1dd,_1de,actionef,optionef,_1df,_1e0,actionf0,optionf0,_1e1,_1e2,actionf1,optionf1,_1e3,_1e4,actionf2,optionf2,_1e5,_1e6,actionf3,optionf3,_1e7,_1e8,actionf4,optionf4,_1e9,_1ea,actionf5,optionf5,_1eb,_1ec,actionf6,optionf6,_1ed,_1ee,actionf7,optionf7,_1ef,_1f0,actionf8,optionf8,_1f1,_1f2,actionf9,optionf9,_1f3,_1f4,actionfa,optionfa,_1f5,_1f6,actionfb,optionfb,_1f7,_1f8,actionfc,optionfc,_1f9,_1fa,actionfd,optionfd,_1fb,_1fc,actionfe,optionfe,_1fd,_1fe,actionff,optionff;
     value=ev.key;
     if(value==="Esc")
      {
       _=processMessages({
        $:4,
        $0:{
         $:0
        },
        $1:{
         $:0
        }
       });
      }
     else
      {
       if(value==="ArrowUp")
        {
         if((!ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
          {
           action=function(id)
           {
            var a;
            a=DimModel.getCurrentCol1(model);
            return processMessages({
             $:4,
             $0:{
              $:1,
              $0:[id,id]
             },
             $1:DimModel["double"](a)
            });
           };
           option=DimModel.getPriorId1(model);
           _2=Option.iter(action,option);
          }
         else
          {
           if(value==="ArrowDown")
            {
             if((!ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
              {
               action1=function(id)
               {
                var a;
                a=DimModel.getCurrentCol1(model);
                return processMessages({
                 $:4,
                 $0:{
                  $:1,
                  $0:[id,id]
                 },
                 $1:DimModel["double"](a)
                });
               };
               option1=DimModel.getNextId1(model);
               _4=Option.iter(action1,option1);
              }
             else
              {
               if(value==="ArrowLeft")
                {
                 if((!ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                  {
                   action2=function(i)
                   {
                    var a;
                    a=DimModel.getCurrentId1(model);
                    return processMessages({
                     $:4,
                     $0:DimModel["double"](a),
                     $1:{
                      $:1,
                      $0:[i,i]
                     }
                    });
                   };
                   option2=DimModel.getPriorCol1(model);
                   _6=Option.iter(action2,option2);
                  }
                 else
                  {
                   if(value==="ArrowRight")
                    {
                     if((!ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                      {
                       action3=function(i)
                       {
                        var a;
                        a=DimModel.getCurrentId1(model);
                        return processMessages({
                         $:4,
                         $0:DimModel["double"](a),
                         $1:{
                          $:1,
                          $0:[i,i]
                         }
                        });
                       };
                       option3=DimModel.getNextCol1(model);
                       _8=Option.iter(action3,option3);
                      }
                     else
                      {
                       if(value==="ArrowUp")
                        {
                         if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                          {
                           action4=function(id)
                           {
                            var action5,option4;
                            action5=function(c)
                            {
                             return processMessages({
                              $:7,
                              $0:{
                               $:1,
                               $0:id
                              },
                              $1:c
                             });
                            };
                            option4=DimModel.getCurrentCol1(model);
                            return Option.iter(action5,option4);
                           };
                           option5=DimModel.getPriorId1(model);
                           _a=Option.iter(action4,option5);
                          }
                         else
                          {
                           if(value==="ArrowDown")
                            {
                             if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                              {
                               action6=function(id)
                               {
                                var action5,option4;
                                action5=function(c)
                                {
                                 return processMessages({
                                  $:7,
                                  $0:{
                                   $:1,
                                   $0:id
                                  },
                                  $1:c
                                 });
                                };
                                option4=DimModel.getCurrentCol1(model);
                                return Option.iter(action5,option4);
                               };
                               option6=DimModel.getNextId1(model);
                               _c=Option.iter(action6,option6);
                              }
                             else
                              {
                               if(value==="ArrowLeft")
                                {
                                 if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                  {
                                   action7=function(c)
                                   {
                                    var action5,option4;
                                    action5=function(id)
                                    {
                                     return processMessages({
                                      $:7,
                                      $0:{
                                       $:1,
                                       $0:id
                                      },
                                      $1:c
                                     });
                                    };
                                    option4=DimModel.getCurrentId1(model);
                                    return Option.iter(action5,option4);
                                   };
                                   option7=DimModel.getPriorCol1(model);
                                   _e=Option.iter(action7,option7);
                                  }
                                 else
                                  {
                                   if(value==="ArrowRight")
                                    {
                                     if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                      {
                                       action8=function(c)
                                       {
                                        var action5,option4;
                                        action5=function(id)
                                        {
                                         return processMessages({
                                          $:7,
                                          $0:{
                                           $:1,
                                           $0:id
                                          },
                                          $1:c
                                         });
                                        };
                                        option4=DimModel.getCurrentId1(model);
                                        return Option.iter(action5,option4);
                                       };
                                       option8=DimModel.getNextCol1(model);
                                       _10=Option.iter(action8,option8);
                                      }
                                     else
                                      {
                                       _10=null;
                                      }
                                     _f=_10;
                                    }
                                   else
                                    {
                                     _f=null;
                                    }
                                   _e=_f;
                                  }
                                 _d=_e;
                                }
                               else
                                {
                                 if(value==="ArrowRight")
                                  {
                                   if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                    {
                                     action9=function(c)
                                     {
                                      var action5,option4;
                                      action5=function(id)
                                      {
                                       return processMessages({
                                        $:7,
                                        $0:{
                                         $:1,
                                         $0:id
                                        },
                                        $1:c
                                       });
                                      };
                                      option4=DimModel.getCurrentId1(model);
                                      return Option.iter(action5,option4);
                                     };
                                     option9=DimModel.getNextCol1(model);
                                     _12=Option.iter(action9,option9);
                                    }
                                   else
                                    {
                                     _12=null;
                                    }
                                   _11=_12;
                                  }
                                 else
                                  {
                                   _11=null;
                                  }
                                 _d=_11;
                                }
                               _c=_d;
                              }
                             _b=_c;
                            }
                           else
                            {
                             if(value==="ArrowLeft")
                              {
                               if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                {
                                 actiona=function(c)
                                 {
                                  var action5,option4;
                                  action5=function(id)
                                  {
                                   return processMessages({
                                    $:7,
                                    $0:{
                                     $:1,
                                     $0:id
                                    },
                                    $1:c
                                   });
                                  };
                                  option4=DimModel.getCurrentId1(model);
                                  return Option.iter(action5,option4);
                                 };
                                 optiona=DimModel.getPriorCol1(model);
                                 _14=Option.iter(actiona,optiona);
                                }
                               else
                                {
                                 if(value==="ArrowRight")
                                  {
                                   if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                    {
                                     actionb=function(c)
                                     {
                                      var action5,option4;
                                      action5=function(id)
                                      {
                                       return processMessages({
                                        $:7,
                                        $0:{
                                         $:1,
                                         $0:id
                                        },
                                        $1:c
                                       });
                                      };
                                      option4=DimModel.getCurrentId1(model);
                                      return Option.iter(action5,option4);
                                     };
                                     optionb=DimModel.getNextCol1(model);
                                     _16=Option.iter(actionb,optionb);
                                    }
                                   else
                                    {
                                     _16=null;
                                    }
                                   _15=_16;
                                  }
                                 else
                                  {
                                   _15=null;
                                  }
                                 _14=_15;
                                }
                               _13=_14;
                              }
                             else
                              {
                               if(value==="ArrowRight")
                                {
                                 if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                  {
                                   actionc=function(c)
                                   {
                                    var action5,option4;
                                    action5=function(id)
                                    {
                                     return processMessages({
                                      $:7,
                                      $0:{
                                       $:1,
                                       $0:id
                                      },
                                      $1:c
                                     });
                                    };
                                    option4=DimModel.getCurrentId1(model);
                                    return Option.iter(action5,option4);
                                   };
                                   optionc=DimModel.getNextCol1(model);
                                   _18=Option.iter(actionc,optionc);
                                  }
                                 else
                                  {
                                   _18=null;
                                  }
                                 _17=_18;
                                }
                               else
                                {
                                 _17=null;
                                }
                               _13=_17;
                              }
                             _b=_13;
                            }
                           _a=_b;
                          }
                         _9=_a;
                        }
                       else
                        {
                         if(value==="ArrowDown")
                          {
                           if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                            {
                             actiond=function(id)
                             {
                              var action5,option4;
                              action5=function(c)
                              {
                               return processMessages({
                                $:7,
                                $0:{
                                 $:1,
                                 $0:id
                                },
                                $1:c
                               });
                              };
                              option4=DimModel.getCurrentCol1(model);
                              return Option.iter(action5,option4);
                             };
                             optiond=DimModel.getNextId1(model);
                             _1a=Option.iter(actiond,optiond);
                            }
                           else
                            {
                             if(value==="ArrowLeft")
                              {
                               if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                {
                                 actione=function(c)
                                 {
                                  var action5,option4;
                                  action5=function(id)
                                  {
                                   return processMessages({
                                    $:7,
                                    $0:{
                                     $:1,
                                     $0:id
                                    },
                                    $1:c
                                   });
                                  };
                                  option4=DimModel.getCurrentId1(model);
                                  return Option.iter(action5,option4);
                                 };
                                 optione=DimModel.getPriorCol1(model);
                                 _1c=Option.iter(actione,optione);
                                }
                               else
                                {
                                 if(value==="ArrowRight")
                                  {
                                   if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                    {
                                     actionf=function(c)
                                     {
                                      var action5,option4;
                                      action5=function(id)
                                      {
                                       return processMessages({
                                        $:7,
                                        $0:{
                                         $:1,
                                         $0:id
                                        },
                                        $1:c
                                       });
                                      };
                                      option4=DimModel.getCurrentId1(model);
                                      return Option.iter(action5,option4);
                                     };
                                     optionf=DimModel.getNextCol1(model);
                                     _1e=Option.iter(actionf,optionf);
                                    }
                                   else
                                    {
                                     _1e=null;
                                    }
                                   _1d=_1e;
                                  }
                                 else
                                  {
                                   _1d=null;
                                  }
                                 _1c=_1d;
                                }
                               _1b=_1c;
                              }
                             else
                              {
                               if(value==="ArrowRight")
                                {
                                 if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                  {
                                   action10=function(c)
                                   {
                                    var action5,option4;
                                    action5=function(id)
                                    {
                                     return processMessages({
                                      $:7,
                                      $0:{
                                       $:1,
                                       $0:id
                                      },
                                      $1:c
                                     });
                                    };
                                    option4=DimModel.getCurrentId1(model);
                                    return Option.iter(action5,option4);
                                   };
                                   option10=DimModel.getNextCol1(model);
                                   _20=Option.iter(action10,option10);
                                  }
                                 else
                                  {
                                   _20=null;
                                  }
                                 _1f=_20;
                                }
                               else
                                {
                                 _1f=null;
                                }
                               _1b=_1f;
                              }
                             _1a=_1b;
                            }
                           _19=_1a;
                          }
                         else
                          {
                           if(value==="ArrowLeft")
                            {
                             if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                              {
                               action11=function(c)
                               {
                                var action5,option4;
                                action5=function(id)
                                {
                                 return processMessages({
                                  $:7,
                                  $0:{
                                   $:1,
                                   $0:id
                                  },
                                  $1:c
                                 });
                                };
                                option4=DimModel.getCurrentId1(model);
                                return Option.iter(action5,option4);
                               };
                               option11=DimModel.getPriorCol1(model);
                               _22=Option.iter(action11,option11);
                              }
                             else
                              {
                               if(value==="ArrowRight")
                                {
                                 if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                  {
                                   action12=function(c)
                                   {
                                    var action5,option4;
                                    action5=function(id)
                                    {
                                     return processMessages({
                                      $:7,
                                      $0:{
                                       $:1,
                                       $0:id
                                      },
                                      $1:c
                                     });
                                    };
                                    option4=DimModel.getCurrentId1(model);
                                    return Option.iter(action5,option4);
                                   };
                                   option12=DimModel.getNextCol1(model);
                                   _24=Option.iter(action12,option12);
                                  }
                                 else
                                  {
                                   _24=null;
                                  }
                                 _23=_24;
                                }
                               else
                                {
                                 _23=null;
                                }
                               _22=_23;
                              }
                             _21=_22;
                            }
                           else
                            {
                             if(value==="ArrowRight")
                              {
                               if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                {
                                 action13=function(c)
                                 {
                                  var action5,option4;
                                  action5=function(id)
                                  {
                                   return processMessages({
                                    $:7,
                                    $0:{
                                     $:1,
                                     $0:id
                                    },
                                    $1:c
                                   });
                                  };
                                  option4=DimModel.getCurrentId1(model);
                                  return Option.iter(action5,option4);
                                 };
                                 option13=DimModel.getNextCol1(model);
                                 _26=Option.iter(action13,option13);
                                }
                               else
                                {
                                 _26=null;
                                }
                               _25=_26;
                              }
                             else
                              {
                               _25=null;
                              }
                             _21=_25;
                            }
                           _19=_21;
                          }
                         _9=_19;
                        }
                       _8=_9;
                      }
                     _7=_8;
                    }
                   else
                    {
                     if(value==="ArrowUp")
                      {
                       if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                        {
                         action14=function(id)
                         {
                          var action5,option4;
                          action5=function(c)
                          {
                           return processMessages({
                            $:7,
                            $0:{
                             $:1,
                             $0:id
                            },
                            $1:c
                           });
                          };
                          option4=DimModel.getCurrentCol1(model);
                          return Option.iter(action5,option4);
                         };
                         option14=DimModel.getPriorId1(model);
                         _28=Option.iter(action14,option14);
                        }
                       else
                        {
                         if(value==="ArrowDown")
                          {
                           if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                            {
                             action15=function(id)
                             {
                              var action5,option4;
                              action5=function(c)
                              {
                               return processMessages({
                                $:7,
                                $0:{
                                 $:1,
                                 $0:id
                                },
                                $1:c
                               });
                              };
                              option4=DimModel.getCurrentCol1(model);
                              return Option.iter(action5,option4);
                             };
                             option15=DimModel.getNextId1(model);
                             _2a=Option.iter(action15,option15);
                            }
                           else
                            {
                             if(value==="ArrowLeft")
                              {
                               if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                {
                                 action16=function(c)
                                 {
                                  var action5,option4;
                                  action5=function(id)
                                  {
                                   return processMessages({
                                    $:7,
                                    $0:{
                                     $:1,
                                     $0:id
                                    },
                                    $1:c
                                   });
                                  };
                                  option4=DimModel.getCurrentId1(model);
                                  return Option.iter(action5,option4);
                                 };
                                 option16=DimModel.getPriorCol1(model);
                                 _2c=Option.iter(action16,option16);
                                }
                               else
                                {
                                 if(value==="ArrowRight")
                                  {
                                   if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                    {
                                     action17=function(c)
                                     {
                                      var action5,option4;
                                      action5=function(id)
                                      {
                                       return processMessages({
                                        $:7,
                                        $0:{
                                         $:1,
                                         $0:id
                                        },
                                        $1:c
                                       });
                                      };
                                      option4=DimModel.getCurrentId1(model);
                                      return Option.iter(action5,option4);
                                     };
                                     option17=DimModel.getNextCol1(model);
                                     _2e=Option.iter(action17,option17);
                                    }
                                   else
                                    {
                                     _2e=null;
                                    }
                                   _2d=_2e;
                                  }
                                 else
                                  {
                                   _2d=null;
                                  }
                                 _2c=_2d;
                                }
                               _2b=_2c;
                              }
                             else
                              {
                               if(value==="ArrowRight")
                                {
                                 if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                  {
                                   action18=function(c)
                                   {
                                    var action5,option4;
                                    action5=function(id)
                                    {
                                     return processMessages({
                                      $:7,
                                      $0:{
                                       $:1,
                                       $0:id
                                      },
                                      $1:c
                                     });
                                    };
                                    option4=DimModel.getCurrentId1(model);
                                    return Option.iter(action5,option4);
                                   };
                                   option18=DimModel.getNextCol1(model);
                                   _30=Option.iter(action18,option18);
                                  }
                                 else
                                  {
                                   _30=null;
                                  }
                                 _2f=_30;
                                }
                               else
                                {
                                 _2f=null;
                                }
                               _2b=_2f;
                              }
                             _2a=_2b;
                            }
                           _29=_2a;
                          }
                         else
                          {
                           if(value==="ArrowLeft")
                            {
                             if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                              {
                               action19=function(c)
                               {
                                var action5,option4;
                                action5=function(id)
                                {
                                 return processMessages({
                                  $:7,
                                  $0:{
                                   $:1,
                                   $0:id
                                  },
                                  $1:c
                                 });
                                };
                                option4=DimModel.getCurrentId1(model);
                                return Option.iter(action5,option4);
                               };
                               option19=DimModel.getPriorCol1(model);
                               _32=Option.iter(action19,option19);
                              }
                             else
                              {
                               if(value==="ArrowRight")
                                {
                                 if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                  {
                                   action1a=function(c)
                                   {
                                    var action5,option4;
                                    action5=function(id)
                                    {
                                     return processMessages({
                                      $:7,
                                      $0:{
                                       $:1,
                                       $0:id
                                      },
                                      $1:c
                                     });
                                    };
                                    option4=DimModel.getCurrentId1(model);
                                    return Option.iter(action5,option4);
                                   };
                                   option1a=DimModel.getNextCol1(model);
                                   _34=Option.iter(action1a,option1a);
                                  }
                                 else
                                  {
                                   _34=null;
                                  }
                                 _33=_34;
                                }
                               else
                                {
                                 _33=null;
                                }
                               _32=_33;
                              }
                             _31=_32;
                            }
                           else
                            {
                             if(value==="ArrowRight")
                              {
                               if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                {
                                 action1b=function(c)
                                 {
                                  var action5,option4;
                                  action5=function(id)
                                  {
                                   return processMessages({
                                    $:7,
                                    $0:{
                                     $:1,
                                     $0:id
                                    },
                                    $1:c
                                   });
                                  };
                                  option4=DimModel.getCurrentId1(model);
                                  return Option.iter(action5,option4);
                                 };
                                 option1b=DimModel.getNextCol1(model);
                                 _36=Option.iter(action1b,option1b);
                                }
                               else
                                {
                                 _36=null;
                                }
                               _35=_36;
                              }
                             else
                              {
                               _35=null;
                              }
                             _31=_35;
                            }
                           _29=_31;
                          }
                         _28=_29;
                        }
                       _27=_28;
                      }
                     else
                      {
                       if(value==="ArrowDown")
                        {
                         if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                          {
                           action1c=function(id)
                           {
                            var action5,option4;
                            action5=function(c)
                            {
                             return processMessages({
                              $:7,
                              $0:{
                               $:1,
                               $0:id
                              },
                              $1:c
                             });
                            };
                            option4=DimModel.getCurrentCol1(model);
                            return Option.iter(action5,option4);
                           };
                           option1c=DimModel.getNextId1(model);
                           _38=Option.iter(action1c,option1c);
                          }
                         else
                          {
                           if(value==="ArrowLeft")
                            {
                             if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                              {
                               action1d=function(c)
                               {
                                var action5,option4;
                                action5=function(id)
                                {
                                 return processMessages({
                                  $:7,
                                  $0:{
                                   $:1,
                                   $0:id
                                  },
                                  $1:c
                                 });
                                };
                                option4=DimModel.getCurrentId1(model);
                                return Option.iter(action5,option4);
                               };
                               option1d=DimModel.getPriorCol1(model);
                               _3a=Option.iter(action1d,option1d);
                              }
                             else
                              {
                               if(value==="ArrowRight")
                                {
                                 if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                  {
                                   action1e=function(c)
                                   {
                                    var action5,option4;
                                    action5=function(id)
                                    {
                                     return processMessages({
                                      $:7,
                                      $0:{
                                       $:1,
                                       $0:id
                                      },
                                      $1:c
                                     });
                                    };
                                    option4=DimModel.getCurrentId1(model);
                                    return Option.iter(action5,option4);
                                   };
                                   option1e=DimModel.getNextCol1(model);
                                   _3c=Option.iter(action1e,option1e);
                                  }
                                 else
                                  {
                                   _3c=null;
                                  }
                                 _3b=_3c;
                                }
                               else
                                {
                                 _3b=null;
                                }
                               _3a=_3b;
                              }
                             _39=_3a;
                            }
                           else
                            {
                             if(value==="ArrowRight")
                              {
                               if((ev.shiftKey?!ev.ctrlKey:false)?!ev.altKey:false)
                                {
                                 action1f=function(c)
                                 {
                                  var action5,option4;
                                  action5=function(id)
                                  {
                                   return processMessages({
                                    $:7,
                                    $0:{
                                     $:1,
                                     $0:id
                                    },
                                    $1:c
                                   });

BTW, I found another instance where code compiled wrong in my setup but worked well in try.websharper.com

What would be the right way to invoke the Websharper compiler in version 4? Can you provide a snippet like the one above?

By Abelardo Mieres on 11/26/2016 1:42 PM (permalink)

Thank you!

By Abelardo Mieres on 11/26/2016 1:09 PM (permalink)

Hi,

try.websharper.com already uses WebSharper 4 beta, that's where the difference is coming from.

WS3 tranlates from F# quotations (ReflectedDefinition), and the F# compiler itself creates these extra-long form on complicated match expressions. WS3 is could have tried to optimize it away, but we never got around to implement this.

WS4 translates from source code (using FSharp.Compiler.Service) which does not have this issue, matches can usually be tranlated to switch statements which are in linear size to the original.

You can find the upgrade guide to WS4 here: WebSharper 3 to 4-beta update guide

By András Jankó on 11/26/2016 7:17 AM (permalink)

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