Warn about export/declare/local masking return values.

ShellCheck/Parser.hs

@@ -950,7 +950,7 @@ readNormalEscaped = called "escaped char" $ do
     pos <- getPosition
     backslash
     do
-        next <- quotable <|> oneOf "?*@!+[]{}.,~"
+        next <- quotable <|> oneOf "?*@!+[]{}.,~#"
         return $ if next == '\n' then "" else [next]
       <|>
         do