Trying a raw borrow with explicit lifetime.

src/parser/text_element_parser.rs

@@ -13,7 +13,7 @@ use nom::error::VerboseError;
 use nom::IResult;
 
 parser_with_context!(text_element, TextElement, i, context, {
-    // not(|i| context.fail_matcher.borrow_mut().parse(i))(i)?;
+    not(|i| (context.fail_matcher)(i))(i)?;
     alt((
         // map(
         //     BoldParser::new(slf.context.fail_matcher.clone()),