{"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"let"}]}
        let bytes = self.read_bytes_ptr_strip_provenance(mplace.ptr(), Size::from_bytes(len))?;
        let len = mplace.len(self)?;
        let s = std::str::from_utf8(bytes).map_err(|err| err_ub!(InvalidStr(err)))?;