Simply returns a version of the given rdeque without the front element. Results in an error if the structure is empty. The original rdeque is left alone.
rdeque to remove elements from.
additional arguments to be passed to or from methods (ignored).
Runs in O(1)-amortized time if the rdeque is used non-persistently (see documentation
rdeque for details). If the given rdeque is empty, an error will be generated.
version of the rdeque with the front element removed.
Okasaki, Chris. Purely Functional Data Structures. Cambridge University Press, 1999.
insert_front for inserting elements.
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