syntax_data: {"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let Expr { ty, temp_lifetime, span, kind } = &self.thir[expr];
context_before:     fn print_expr(&mut self, expr: ExprId, depth_lvl: usize) {
context_after:         print_indented!(self, "Expr {", depth_lvl);