text: import { getGlobal as _getGlobal } from "aexpr-source-transformation-propagation";
  import { getMember as _getMember } from "aexpr-source-transformation-propagation";
  import { setMember as _setMember } from "aexpr-source-transformation-propagation";
  // nested left side of assignment
  _setMember(_getMember((_getGlobal("a"), a), "b"), "c", _getMember((_getGlobal("y"), y), "z"));