syntax_data: {"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let block = &self.cfg.basic_blocks[arm_block];
context_before:         for arm_block in arm_end_blocks {
context_after:             let last_location = block.statements.last().map(|s| s.source_info);