scanner expected() vs parser expected()

[nteetor]

Within the parser class, the expected() function returns a token if the token was expected, otherwise an error is thrown.

Within scanner expected() was removed from the traversal class, is now part of the scanner class, and behaves similarly to the parser expected function. However, the methods of scanner do not currently utilize the return value of expected(). Reviewing and refactoring scanner to utilize the return value of expected could prove useful.