syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Here the `'a` lifetime is bound in the outer function, but appears as an argument of the
context_before:     /// ```
context_after:     /// inner one. Therefore, that appearance will have a DebruijnIndex of 2, because we must skip