{"ast_node_type":"function","tokens":[{"end":64,"kind":"keyword","start":0,"text":"fn"}]}
    fn is_thin_ptr_ty(&self, span: Span, ty: Ty<'tcx>) -> bool {
    // FIXME(compiler-errors): This could use `<$ty as Pointee>::Metadata == ()`
        // Type still may have region variables, but `Sized` does not depend