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An argument list queue is a FIFO (first-in-first-out) sequence of argument lists belonging to a particular expression.
During evaluation and member resolution, argument lists within a queue are statically consumed to determine that an expression is valid. At runtime, these argument lists start out unconsumed and are consumed again as they are applied to specific array or procedure references. An argument list is considered empty, either statically or at runtime, if the queue has no argument lists or if all of its argument lists are currently consumed.