{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"syntax_contexts:"}]}
    syntax_contexts: &'a FxHashMap<u32, AbsoluteBytePos>,
    alloc_decoding_session: AllocDecodingSession<'a>,
    expn_data: &'a UnhashMap<ExpnHash, AbsoluteBytePos>,