syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"ctxt:"}]}
source_snippet:             ctxt: SyntaxContext::from_u16(self.ctxt),
context_before:         SpanData {
context_after:             ..with_span_interner(|interner| interner.spans[self.index as usize])