@Nullable
    private static PsiMethodCallExpression extractAddMethod(@NotNull TerminalBlock terminalBlock,
                                                            @NotNull PsiExpressionStatement additionToListStatement) {
      PsiMethodCallExpression additionToList = tryCast(additionToListStatement.getExpression(), PsiMethodCallExpression.class);
      if (!LIST_ADD.test(additionToList)) return null;
      PsiExpression[] additionArgs = additionToList.getArgumentList().getExpressions();
      PsiExpression arg = additionArgs[0];
      PsiReferenceExpression referenceExpression = tryCast(arg, PsiReferenceExpression.class);
      if (referenceExpression == null) return null;
      PsiVariable savedVar = tryCast(referenceExpression.resolve(), PsiVariable.class);
      if(savedVar == null) return null;
      if (!savedVar.equals(terminalBlock.getVariable())) return null;
      return additionToList;
    }
@Nullable
    private static PsiMethodCallExpression extractAddMethod(@NotNull TerminalBlock terminalBlock,
                                                            @NotNull PsiExpressionStatement additionToListStatement)