syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"ExpnKind::AstPass(_)"}]}
source_snippet:             ExpnKind::AstPass(_) | ExpnKind::Desugaring(_) => true, // well, it's "external"
context_before:             ) => false,
context_after:             ExpnKind::Macro(MacroKind::Bang, _) => {