syntax_data: {"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let old_pre_binding = leaf_candidate.pre_binding_block.unwrap();
context_before:                     // Falsely branch to `next_candidate_start_block` before reaching pre_binding.
context_after:                     let new_pre_binding = self.cfg.start_new_block();