syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// | yes           | yes | yes           | yes      | yes |
context_before: /// | external      | no  | if-ext        | if-ext   | yes |
context_after: #[derive(Clone, Copy, PartialEq, Hash, Debug)]