{"ast_node_type":"impl","tokens":[{"end":97,"kind":"keyword","start":0,"text":"mut"}]}
        mut adjust_ptr: impl FnMut(Pointer<CtfeProvenance>) -> InterpResult<'tcx, Pointer<Prov>>,
        alloc_bytes: impl FnOnce(&[u8], Align) -> InterpResult<'tcx, Bytes>,
    ) -> InterpResult<'tcx, Allocation<Prov, (), Bytes>> {