syntax_data: {"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let len = (self.len_with_tag_or_marker & !PARENT_TAG) as u32;
context_before:             let lo = self.lo_or_index;
context_after:             debug_assert!(len <= MAX_LEN);