syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:         /// then computes an answer using those trees.
context_before:         /// This method begins by converting `src` and `dst` from `Ty`s to `Tree`s,
context_after:         #[instrument(level = "debug", skip(self), fields(src = ?self.src, dst = ?self.dst))]