syntax_data: {"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let assign_unwind = self.cfg.start_new_cleanup_block();
context_before:         // create the new block for the assignment in the case of unwinding
context_after:         self.cfg.push_assign(assign_unwind, source_info, place, value.clone());