Fix footnote definition end matcher detecting the next footnote definition.

src/parser/footnote_definition.rs

@@ -83,10 +83,18 @@ fn footnote_definition_end<'r, 's>(
     input: &'s str,
 ) -> Res<&'s str, &'s str> {
     let start_of_line_matcher = parser_with_context!(start_of_line)(context);
-    let footnote_definition_matcher = parser_with_context!(footnote_definition)(context);
+    let allow_nesting_context =
+        context.with_additional_node(ContextElement::Context("allow nesting footnotes"));
+    let footnote_definition_matcher = parser_with_context!(footnote_definition)(
+        if immediate_in_section(context, "footnote definition") {
+            &allow_nesting_context
+        } else {
+            context
+        },
+    );
     let maybe_consume_trailing_whitespace_matcher =
         parser_with_context!(maybe_consume_trailing_whitespace)(context);
-    alt((
+    let (remaining, source) = alt((
         recognize(tuple((
             maybe_consume_trailing_whitespace_matcher,
             footnote_definition_matcher,
@@ -95,7 +103,9 @@ fn footnote_definition_end<'r, 's>(
             start_of_line_matcher,
             verify(many1(blank_line), |lines: &Vec<&str>| lines.len() >= 2),
         ))),
-    ))(input)
+    ))(input)?;
+
+    Ok((remaining, source))
 }
 
 #[cfg(test)]

toy_language.txt

@@ -1,5 +1,8 @@
-:firstdrawer:
-:seconddrawer:
-foo
-:end:
-:end:
+[fn:1] A footnote.
+
+[fn:2] A multi-
+
+line footnote.
+
+
+not in the footnote.