private @NotNull Collection<PsiVariable> getVariablesToFix() {
    Map<PsiVariable, Boolean> vars = myContext.getUserData(VARS[myFixType]);
    if (vars == null) {
      vars = ((UserDataHolderEx)myContext).putUserDataIfAbsent(VARS[myFixType], ContainerUtil.createConcurrentWeakMap());
    }
    final Map<PsiVariable, Boolean> finalVars = vars;
    return new AbstractCollection<>() {
      @Override
      public boolean add(PsiVariable psiVariable) {
        return finalVars.put(psiVariable, Boolean.TRUE) == null;
      }

      @Override
      public @NotNull Iterator<PsiVariable> iterator() {
        return finalVars.keySet().iterator();
      }

      @Override
      public int size() {
        return finalVars.size();
      }
    };
  }
private @NotNull Collection<PsiVariable> getVariablesToFix()