Make "single-use" callbacks FnOnce
#51
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This is more general than `FnMut`, which is useful in some cases. jnqnfe#50
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This is more general than
FnMut, which is useful in some cases.#50
It's hard to be sure that this covers everything (and the consistency of types can't be checked by the compiler everywhere due to pointer casts...), but this should be an improvement.