syntax_data: {"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let data = with_span_interner(|interner| interner.spans[index as usize]);
context_before:             let index = self.lo_or_index;
context_after:             data.lo == BytePos(0) && data.hi == BytePos(0)