{"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"let"}]}
            let span = (span, locals.body.owner);
            self.fill_locals_for_body(&mir_body, &mut locals, arg_bytes.into_iter())?;
            Some(StackFrame { locals, destination: Some(target_bb), prev_stack_ptr, span })