{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
        let ret_reason = self.maybe_get_coercion_reason(hir_id, if_span);
        let hir_id = self.tcx.parent_hir_id(self.tcx.parent_hir_id(then_expr.hir_id));
        let cause = self.cause(if_span, ObligationCauseCode::IfExpressionWithNoElse);