Better messages for ignored backslashes like 'echo foo\n'

ShellCheck/Parser.hs

@@ -691,8 +691,15 @@ readNormalEscaped = called "escaped char" $ do
       <|>
         do
             next <- anyChar
-            parseNoteAt pos WarningC $ "Did you mean \"$(printf \"\\" ++ [next] ++ "\")\"? The shell just ignores the \\ here."
+            case escapedChar next of
+                Just name -> parseNoteAt pos WarningC $ "\\" ++ [next] ++ " is just literal '" ++ [next] ++ "' here. For " ++ name ++ ", use \"$(printf \"\\" ++ [next] ++ "\")\"."
+                Nothing -> parseNoteAt pos InfoC $ "This \\" ++ [next] ++ " will be a regular '" ++ [next] ++ "' in this context."
             return [next]
+  where
+    escapedChar 'n' = Just "line feed"
+    escapedChar 't' = Just "tab"
+    escapedChar 'r' = Just "carriage return"
+    escapedChar _ = Nothing
 
 
 prop_readExtglob1 = isOk readExtglob "!(*.mp3)"