trait ExtractorSubPatternAlignment extends AnyRef
The arities we can derive looking only at the subpatterns (the args of the unapply node)
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args: List[Global.Tree]
Args will be broken down into the concatenation of:
productArity
product patterns (fixed length, corresponding to fields in case class or tuple components in classic unapply, or product selectors in product-based unapply)elementArity
element patterns (explicit patterns that pick off the prefix of the final sequence-valued component of the unapply, or a repeated case constructor arg)starArity
star patterns (0 or 1, absorbs the remaining variable-length components)
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