Using a mutable reference breaks clone.

src/parser/nom_context.rs

@@ -2,9 +2,8 @@ use nom::branch::alt;
 use nom::error::VerboseError;
 use nom::IResult;
 
-#[derive(Clone)]
 pub struct NomContext<'a> {
-    pub fail_matcher: &'a dyn FnMut(&str) -> IResult<&str, &str, VerboseError<&str>>,
+    pub fail_matcher: &'a mut dyn FnMut(&str) -> IResult<&str, &str, VerboseError<&str>>,
     /// You can't have nested bolds or links in org-mode
     pub can_match_bold: bool,
     pub can_match_link: bool,
@@ -12,7 +11,7 @@ pub struct NomContext<'a> {
 
 impl<'a> NomContext<'a> {
     pub fn new(
-        fail_matcher: &'a dyn FnMut(&str) -> IResult<&str, &str, VerboseError<&str>>,
+        fail_matcher: &'a mut dyn FnMut(&str) -> IResult<&str, &str, VerboseError<&str>>,
     ) -> Self {
         NomContext {
             fail_matcher,

src/parser/text.rs

@@ -133,7 +133,7 @@ pub fn paragraph_end(input: &str) -> Res<&str, &str> {
 }
 
 pub fn document(input: &str) -> Res<&str, Vec<(Vec<TextElement>, &str)>> {
-    let initial_context = NomContext::new(&paragraph_end);
+    let initial_context = NomContext::new(&mut paragraph_end);
     todo!()
     // many1(parser_with_context!(paragraph)(initial_context))(input)
 }

src/parser/text_element_parser.rs

@@ -25,5 +25,6 @@ fn flat_text_element<'s, 'r>(
     i: &'s str,
     context: &'r mut NomContext,
 ) -> Res<&'s str, TextElement<'s>> {
+    not(&mut context.fail_matcher)(i)?;
     todo!()
 }