finally setup an LSP - fixed all warnings

app/Parser.hs

@@ -1,9 +1,9 @@
 module Parser where
 
 import Monpar
-import Control.Applicative ((<|>), Alternative, many, some)
+import Control.Applicative ((<|>), many, some)
+import Control.Monad (void)
 import Data.Char (isDigit, digitToInt)
-import Control.Monad (MonadPlus(mzero), void) 
 
 type ZorthAST = [ZorthExpr]
 
@@ -35,21 +35,18 @@ pZorthUnsignedInteger = ZorthASTInteger .  foldr (\n t -> n + t*10) 0 . reverse
 
 pZorthSignedInteger :: Parser ZorthExpr
 pZorthSignedInteger = do
-    char '-'
+    _ <- char '-'
     (ZorthASTInteger i) <- pZorthUnsignedInteger
     return $ ZorthASTInteger $ negate i
 
 pZorthInteger :: Parser ZorthExpr
-pZorthInteger = do
-    skipNonsenseSymbols
-    i <- pZorthSignedInteger <|> pZorthUnsignedInteger 
-    return i
+pZorthInteger = skipNonsenseSymbols >> pZorthSignedInteger <|> pZorthUnsignedInteger 
 
 pZorthWord :: Parser ZorthExpr
 pZorthWord = do
-    skipNonsenseSymbols
+    _ <- skipNonsenseSymbols
     w <- word1
-    eof <|> (nonsenseSymbol >> return ())
+    eof <|> void nonsenseSymbol
     return $ ZorthASTWord w 
 
 pZorthWordDecl :: Parser ZorthExpr