{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
        let span = if !span.is_dummy() { span } else { self.layout_tcx_at_span() };
    fn spanned_layout_of(&self, ty: Ty<'tcx>, span: Span) -> Self::LayoutOfResult {
        let tcx = self.tcx().at(span);