syntax_data: {"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let Block { targeted_by_break, span, region_scope, stmts, expr, safety_mode } =
context_before:     fn print_block(&mut self, block_id: BlockId, depth_lvl: usize) {
context_after:             &self.thir.blocks[block_id];