diff --git a/source/src/BNFC/Backend/Common/Makefile.hs b/source/src/BNFC/Backend/Common/Makefile.hs
index 33dc9fa1..fb6a7e34 100644
--- a/source/src/BNFC/Backend/Common/Makefile.hs
+++ b/source/src/BNFC/Backend/Common/Makefile.hs
@@ -12,7 +12,7 @@ import BNFC.PrettyPrint
 --
 -- >>> mkRule "main" ["file1","file2"] ["do something"]
 -- main : file1 file2
--- 	do something
+--      do something
 -- <BLANKLINE>
 --
 -- >>> mkRule "main" ["program.exe"] []
diff --git a/source/src/BNFC/Backend/FSharp.hs b/source/src/BNFC/Backend/FSharp.hs
index 443bdc60..30b9f334 100644
--- a/source/src/BNFC/Backend/FSharp.hs
+++ b/source/src/BNFC/Backend/FSharp.hs
@@ -72,7 +72,7 @@ showFile      = mkFile withLang "Show" "fs"
 showFileM     = mkMod  withLang "Show"
 tFileM         = mkMod withLang "Test"
 tFile         = mkFile withLang "Test" "fs"
-utilFileM     = mkMod  noLang   "BnfcUtil" 
+utilFileM     = mkMod  noLang   "BnfcUtil"
 utilFile      = mkFile noLang   "BnfcUtil" "fs"
 fsprojFile    = mkFile withLang  "" "fsproj"
 
@@ -105,7 +105,7 @@ makefile :: SharedOptions -> String -> Doc
 makefile opts basename = vcat
     [
      mkRule "clean" []
-        [ "-rm -fr bin obj "] 
+        [ "-rm -fr bin obj "]
     ,mkRule "distclean" ["clean"]
         [ "-rm -f " ++ unwords [ mkFile withLang "Lex" "*" opts,
                                  mkFile withLang "Par" "*" opts,
@@ -169,4 +169,4 @@ fsprojM opts = unlines
   ,"  </ItemGroup>"
 
   ,"</Project>"
-  ]
\ No newline at end of file
+  ]
diff --git a/source/src/BNFC/Backend/FSharp/CFtoFSharpPrinter.hs b/source/src/BNFC/Backend/FSharp/CFtoFSharpPrinter.hs
index 50e893d5..33b20021 100644
--- a/source/src/BNFC/Backend/FSharp/CFtoFSharpPrinter.hs
+++ b/source/src/BNFC/Backend/FSharp/CFtoFSharpPrinter.hs
@@ -227,4 +227,3 @@ mkRhs args its =
   mk _ _ = []
   prt c = prtFun c +++ show (precCat c)
 
-
diff --git a/source/src/BNFC/Backend/FSharp/CFtoFSharpShow.hs b/source/src/BNFC/Backend/FSharp/CFtoFSharpShow.hs
index de92ecf7..356ad082 100644
--- a/source/src/BNFC/Backend/FSharp/CFtoFSharpShow.hs
+++ b/source/src/BNFC/Backend/FSharp/CFtoFSharpShow.hs
@@ -1,6 +1,6 @@
 {-
     TODO: Check if printing fot native fsharp objects like choice types or algebraic types can handle this (it would allow to remove most of the code here)
-    BNF Converter: Non-pretty-printer generator 
+    BNF Converter: Non-pretty-printer generator
     Copyright (C) 2021  Author:  Grzegorz Dziadkiewicz
 
 -}
@@ -131,4 +131,3 @@ mkRhs args its =
   mk args       (Right _ : items) = mk args items
   mk _ _ = []
 
-
diff --git a/source/src/BNFC/Backend/FSharp/CFtoFSharpTemplate.hs b/source/src/BNFC/Backend/FSharp/CFtoFSharpTemplate.hs
index a460a39b..5b9005ba 100644
--- a/source/src/BNFC/Backend/FSharp/CFtoFSharpTemplate.hs
+++ b/source/src/BNFC/Backend/FSharp/CFtoFSharpTemplate.hs
@@ -61,6 +61,6 @@ case_fun cat xs = unlines $
          [
           "trans" ++ show cat +++ "(x : " ++ fixType cat ++ ") : Result =",
            indent 1 "match x with"
-         ] ++ 
+         ] ++
          (map (indent 1) . insertBar . map (++ " -> failure x")) xs
-         
+
diff --git a/source/src/BNFC/Backend/FSharp/CFtoFSharpTest.hs b/source/src/BNFC/Backend/FSharp/CFtoFSharpTest.hs
index dd8e62a2..e9f885db 100644
--- a/source/src/BNFC/Backend/FSharp/CFtoFSharpTest.hs
+++ b/source/src/BNFC/Backend/FSharp/CFtoFSharpTest.hs
@@ -40,7 +40,7 @@ fsharpTestfile absM lexM parM printM showM moduleName cf =
         topType2 = text $ fixType $ normCat $ firstEntry cf
     in vcat
         [ comment "automatically generated by the BNF Converter"
-        , text ("module" +++ moduleName) 
+        , text ("module" +++ moduleName)
         , "open System"
         , "open System.IO"
         , "open FSharp.Text.Lexing"
@@ -54,9 +54,9 @@ fsharpTestfile absM lexM parM printM showM moduleName cf =
         , nest 4 ("c |> LexBuffer<char>.FromTextReader |>" <+> parserName <+> lexerName )
         , ""
         , "let showTree (t:" <> topType2 <> ") : string ="
-        , nest 4 (vcat ( punctuate " +" 
+        , nest 4 (vcat ( punctuate " +"
             [ doubleQuotes "[Abstract syntax]\\n\\n"
-            , showFun <+> "t" 
+            , showFun <+> "t"
             , doubleQuotes "\\n\\n"
             , doubleQuotes "[Linearized tree]\\n\\n"
             , printerName <+> "t"
diff --git a/source/src/BNFC/Backend/FSharp/CFtoFsLex.hs b/source/src/BNFC/Backend/FSharp/CFtoFsLex.hs
index 154d168d..db87bb98 100644
--- a/source/src/BNFC/Backend/FSharp/CFtoFsLex.hs
+++ b/source/src/BNFC/Backend/FSharp/CFtoFsLex.hs
@@ -168,7 +168,7 @@ rules cf = mkRule "token" $
     ++
     -- reserved keywords
     [ ( "rsyms"
-      , vcat 
+      , vcat
         [ "let x = lexeme lexbuf"
         , "match Map.tryFind x symbol_table with"
         , "| Some result -> result"
@@ -204,7 +204,7 @@ rules cf = mkRule "token" $
     (multilineC, singleLineC) = comments cf
     tokenAction pos t = case asciiKeywords cf of
         [] -> "TOK_" <> t <+> arg "(lexeme lexbuf)"
-        _  -> vcat 
+        _  -> vcat
                 [ "let l = lexeme lexbuf"
                 , "Map.tryFind l resword_table"
                 , "|> Option.defaultValue (TOK_" <> t <+> arg "l)"
diff --git a/source/src/BNFC/Backend/FSharp/FSharpUtil.hs b/source/src/BNFC/Backend/FSharp/FSharpUtil.hs
index 03b33147..a83b9e40 100644
--- a/source/src/BNFC/Backend/FSharp/FSharpUtil.hs
+++ b/source/src/BNFC/Backend/FSharp/FSharpUtil.hs
@@ -104,8 +104,8 @@ reservedFsLex =
   , "refill"
   , "rule"
   , "shortest"
-  
-  ,"letter" 
+
+  ,"letter"
   ,"upper"
   ,"lower"
   ,"digit"
@@ -139,4 +139,4 @@ showsFunQual :: (String -> String) -> Cat -> String
 showsFunQual qual = loop where
   loop = \case
     ListCat c -> qual "showList" +++ loop c
-    c         -> qual "show" ++ fixType (normCat c)
\ No newline at end of file
+    c         -> qual "show" ++ fixType (normCat c)