syntax_data: {"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"ctxt:"}]}
source_snippet:             ctxt: SyntaxContext::root(),
context_before:             hi: BytePos(self.lo.debug_strict_add(len)),
context_after:             parent: Some(LocalDefId { local_def_index: DefIndex::from_u16(self.parent) }),