Try and backtrack

src/MdToHTML.hs

@@ -377,7 +377,7 @@ parseListLineItemCommon :: Parser MdToken
 parseListLineItemCommon = do
   space
   restOfLine <- manyTill parseListLineToken (void (char '\n') <|> eof)
-  nestedList <- parseListNested <|> return (Unit "")
+  nestedList <- try parseListNested <|> return (Unit "")
   return $ Line [Line restOfLine, nestedList]
 
 -- Parse an unordered list paragraph item.