simple functional queue from Okasaki#558
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Hi, this is my first attempt at contributing Lean code.
I dug out the old Okasaki, and started off with the simple queue. This should
contain a correctness proof, a complexity proof, and a mapping to a ghost list
of elements.
TimeMdoesn't seem to be enough for amortized complexity soI added a module for that, and I also removed the
ZeroAddtypeclass constraintbecause
\Ndoesn't implement it(!).AI disclosure: all code is mine, but I had some assistance from GLM 5.1 to
tidy up proof terms and get unstuck.