Actually, it turns out that the conflict is pretty obvious even without
the debug output. consider this input:
"5 6 +4"
How do you expect this to be scanned? Does it contain 3
summation_expressions ("5", "6", "+4") or 2 ("5", "6+4")? There's an
ambiguity - you haven't defined an expression list in an unambiguuous way.
this is a very common problem - how do you define a list of something
complex? Can you define expression lists to require a separator? How about
"5, 6, +4" -> 3 expressions
"5, 6 +4" -> 2 expressions
Is
it okay if I disregard the conflict if the grammar works anyway?
I personally think that this is a mistake, but it is commonly done. The
problems are that you may not understand why there is a conflict in the
first place, and any subsequent maintainers certainly won't understand;
I prefer to try to remove the conflict.
Evan
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