syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"#[instrument(level"}]}
source_snippet:         #[instrument(level = "debug", skip(self), fields(src = ?self.src, dst = ?self.dst))]
context_before:         /// then computes an answer using those trees.
context_after:         pub(crate) fn answer(