syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Bruijn index of 0, meaning "the innermost binder" (in this case, a
context_before:     /// argument to the inner function. This region `'b` is assigned a De
context_after:     /// fn). The region `'a` that appears in the second argument type (`&'a