Data commit

Task/Queue-Definition/11l/queue-definition.11l

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+T FIFO
+   [Int] contents
+
+   F push(item)
+      .contents.append(item)
+   F pop()
+      R .contents.pop(0)
+   F empty()
+      R .contents.empty
+
+V f = FIFO()
+f.push(3)
+f.push(2)
+f.push(1)
+L !f.empty()
+   print(f.pop())