{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
                let layout_new = self.cx.expr_path(self.cx.path(self.span, layout_new));
                    self.cx.std_path(&[sym::alloc, sym::Layout, sym::from_size_align_unchecked]);
                let size = self.cx.expr_ident(self.span, size);