Simply returns a version of the given rpqueue without the front element. Results in an error if the structure is empty. The original rpqueue is left alone.
rpqueue to remove elements from.
additional arguments to be passed to or from methods (ignored).
Runs in O(1) worst case time.
version of the rpqueue with the front element removed.
Okasaki, Chris. Purely Functional Data Structures. Cambridge University Press, 1999.
peek_front for accessing the front element.
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