How to use the @truffle/debug-utils.cleanThis function in @truffle/debug-utils

//HACK -- we can't use "this" as a variable name, so we're going to
    //find an available replacement name, and then modify the context
    //and expression appropriately
    let pseudoThis = "_this";
    while (pseudoThis in context) {
      pseudoThis = "_" + pseudoThis;
    }
    //in addition to pseudoThis, which replaces this, we also have
    //pseudoPseudoThis, which replaces pseudoThis in order to ensure
    //that any uses of pseudoThis yield an error instead of showing this
    let pseudoPseudoThis = "thereisnovariableofthatname";
    while (pseudoPseudoThis in context) {
      pseudoPseudoThis = "_" + pseudoPseudoThis;
    }
    context = DebugUtils.cleanThis(context, pseudoThis);
    let expr = raw.replace(
      //those characters in [] are the legal JS variable name characters
      //note that pseudoThis contains no special characters
      new RegExp("(?