From type/X/Parameter/Twigil

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The name of the offensive parameter ($=foo in the example above)

From type/X/Parameter/Default

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Returns the parameter name

From type/X/Parameter/Placeholder

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The text of the offensive parameter declaration ($:param in the example above).

From type/X/Parameter/WrongOrder

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Returns the name of the (first) misplaced parameter

From type/X/Parameter/MultipleTypeConstraints

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Returns the name of the offensive parameter.