fixup! inline: disallow containers of zero length

src/inline.rs

@@ -416,6 +416,7 @@ impl<I: Iterator<Item = char> + Clone> Parser<I> {
                         // empty container
                         return None;
                     }
+
                     let inner_span = Span::new(self.events[e_opener].span.end(), self.span.start());
                     let mut event_closer = match Container::try_from(d) {
                         Ok(cont) => {