syntax_data: {"ast_node_type":"other","tokens":[{"end":13,"kind":"keyword","start":0,"text":"}"}]}
source_snippet:             }
context_before:                 expn_data.def_site.is_dummy() || sm.is_imported(expn_data.def_site)
context_after:             ExpnKind::Macro { .. } => true, // definitely a plugin