syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// This is basically the same as `feature_err_issue`
context_before: /// This is only used by unstable_feature_bound as it does not have issue number information for now.
context_after: /// but without the feature issue note. If we can do a lookup for issue number from feature name,