public @NotNull Variable addVariable(@NonNls @NotNull String name,
                                       Expression expression,
                                       Expression defaultValueExpression,
                                       boolean isAlwaysStopAt) {
    return addVariable(name, expression, defaultValueExpression, isAlwaysStopAt, false);
  }
public @NotNull Variable addVariable(@NonNls @NotNull String name,
                                       Expression expression,
                                       Expression defaultValueExpression,
                                       boolean isAlwaysStopAt)