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Like succ, but doesn't fail on maxBound. Instead it returns minBound.

>>> next False
True
>>> next True
False
>>> succ True
*** Exception: Prelude.Enum.Bool.succ: bad argument

Since: 0.1.0

Like pred, but doesn't fail on minBound. Instead it returns maxBound.

>>> prev True
False
>>> prev False
True
>>> pred False
*** Exception: Prelude.Enum.Bool.pred: bad argument

Since: 0.6.0.0

Returns Nothing if given Int outside range.

>>> safeToEnum @Bool 0
Just False
>>> safeToEnum @Bool 1
Just True
>>> safeToEnum @Bool 2
Nothing
>>> safeToEnum @Bool (-1)
Nothing

Since: 0.1.0