{"ast_node_type":"function","tokens":[{"end":59,"kind":"keyword","start":0,"text":"fn"}]}
    fn as_ref(&self) -> &LayoutData<FieldIdx, VariantIdx> {
impl<'a, Ty> AsRef<LayoutData<FieldIdx, VariantIdx>> for TyAndLayout<'a, Ty> {
        &*self.layout.0.0