syntax_data: {"ast_node_type":"import","tokens":[{"end":74,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// then we should directly use `feature_err_issue` for ambiguity error of
context_before: /// but without the feature issue note. If we can do a lookup for issue number from feature name,
context_after: /// `#[unstable_feature_bound]`.