Annotate Queue, Deque, and BlockingDeque peek methods with @Pure - #137
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@Pure
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Annotate
Queue.peek(),Deque.peekFirst(),Deque.peekLast(),Deque.peek(), andBlockingDeque.peek()with@Pure(and@GuardSatisfied).Concrete implementations in
java.utilandjava.util.concurrent(such asArrayDeque,LinkedList,PriorityQueue,ConcurrentLinkedQueue,LinkedBlockingQueue, etc.) already had@Pureannotations; this adds the annotations to the interface declarations.Merge before eisop/checker-framework#1603.