syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// | cmd \ attr    | no  | (unspecified) | external | yes |
context_before: /// if-ext - if macro from different crate (related to callsite code)
context_after: /// | no            | no  | no            | no       | no  |