Do not consume trailing whitespace on the footnote definition's final element.

src/parser/util.rs

@@ -211,3 +211,15 @@ pub fn text_until_eol<'r, 's>(
         .map(|(_remaining, line)| Into::<&str>::into(line))?;
     Ok(line.trim())
 }
+
+pub fn include_input<'s, F, O>(
+    mut inner: F,
+) -> impl FnMut(OrgSource<'s>) -> Res<OrgSource<'s>, (OrgSource<'s>, O)>
+where
+    F: FnMut(OrgSource<'s>) -> Res<OrgSource<'s>, O>,
+{
+    move |input: OrgSource<'_>| {
+        let (remaining, output) = inner(input)?;
+        Ok((remaining, (input, output)))
+    }
+}