Port paragraph parser to use ak_element.

src/parser/paragraph.rs

@@ -23,17 +23,22 @@ use crate::error::Res;
 use crate::parser::object_parser::standard_set_object;
 use crate::parser::util::exit_matcher_parser;
 use crate::parser::util::start_of_line;
+use crate::types::Keyword;
 use crate::types::Paragraph;
 
 #[cfg_attr(
     feature = "tracing",
     tracing::instrument(ret, level = "debug", skip(context))
 )]
-pub(crate) fn paragraph<'b, 'g, 'r, 's>(
+pub(crate) fn paragraph<'b, 'g, 'r, 's, AK>(
+    affiliated_keywords: AK,
+    remaining: OrgSource<'s>,
     context: RefContext<'b, 'g, 'r, 's>,
     input: OrgSource<'s>,
-) -> Res<OrgSource<'s>, Paragraph<'s>> {
-    let (remaining, affiliated_keywords) = many0(affiliated_keyword)(input)?;
+) -> Res<OrgSource<'s>, Paragraph<'s>>
+where
+    AK: IntoIterator<Item = Keyword<'s>>,
+{
     let contexts = [ContextElement::ExitMatcherNode(ExitMatcherNode {
         class: ExitClass::Gamma,
         exit_matcher: &paragraph_end,