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collections define: #Queue &parents: {ExtensibleArray}.
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q@(Queue traits) isEmpty [resend].
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q@(Queue traits) push: obj [q addLast: obj].
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q@(Queue traits) pop [q removeFirst].
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q@(Queue traits) pushAll: c [q addAllLast: c].
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q@(Queue traits) pop: n [q removeFirst: n].
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