syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// to refer to that region `'a` in the second argument (the `_`),
context_before:     /// because it is the bound 3 binders out. However, if we wanted
context_after:     /// those two binders would not be in scope. In that case, we