Remove dead line of code.

src/parser/plain_text.rs

@@ -13,7 +13,6 @@ pub fn plain_text<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s s
             "Zero input length to plain_text.",
         ))));
     }
-    // not(|i| context.check_exit_matcher(i))(input)?;
     let mut current_input = input.char_indices();
     loop {
         match current_input.next() {