syntax_data: {"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                             if let Some(out_expr) = out_expr {
context_before:                             self.visit_expr(&self.thir()[*in_expr]);
context_after:                                 self.visit_expr(&self.thir()[*out_expr]);