Nadeem,
You're mixing "..." repetition with mapping some kind of operation
over each element, and that doesn't work, at least not directly.
Also, the way you've used ~or does not preserve the ordering of
elements. Instead, the attributes a and b just get all the a/b pairs,
and c gets all the c el
I'm struggling with figuring out how to work with ~or patterns and
syntax/parse. Suppose, for example, I want to write a macro that takes
any number of either single numbers or pairs of numbers. It should
expand into a list of results where each single number is negated and
each pair is summed toge
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