syntax_data: {"ast_node_type":"function","tokens":[{"end":90,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn find_ancestor_not_from_extern_macro(mut self, sm: &SourceMap) -> Option<Span> {
context_before:     /// - [`Self::in_external_macro`]
context_after:         while self.in_external_macro(sm) {