Provide goal-expansion for PhraseGoal. PhraseGoal is either
phrase/2,3 or call_dcg/2,3. The current version does not
translate control structures, but only simple terminals and
non-terminals.
For example:
?- expand_phrase(phrase(("ab", rule)), List), Goal).
Goal = (List=[97, 98|_G121], rule(_G121, [])).
- throws
- - Re-throws errors from dcg_translate_rule/2