syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"self.visit_expr(&self.thir()[*in_expr]);"}]}
source_snippet:                             self.visit_expr(&self.thir()[*in_expr]);
context_before:                         SplitInOut { in_expr, out_expr, reg: _, late: _ } => {
context_after:                             if let Some(out_expr) = out_expr {