Switch to RefContext.

src/parser/diary_sexp.rs

@@ -18,7 +18,7 @@ use crate::parser::DiarySexp;
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
 pub fn diary_sexp<'r, 's>(
-    _context: Context<'r, 's>,
+    _context: RefContext<'r, 's>,
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, DiarySexp<'s>> {
     start_of_line(input)?;