{"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
        let RenderAllocation { tcx, alloc } = *self;
    fn fmt(&self, w: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(w, "size: {}, align: {})", alloc.size().bytes(), alloc.align.bytes())?;