syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"..ExpnData::default(kind,"}]}
source_snippet:             ..ExpnData::default(kind, call_site, edition, macro_def_id, parent_module)
context_before:             allow_internal_unstable: Some(allow_internal_unstable),
context_after:         }