Operators for working with the Writer type
f <!> x
'a -> 'b
Writer<'c, 'a>
Writer<'c, 'b>
Writer.map
f <*> x
Writer<'a, ('b -> 'c)>
Writer<'a, 'b>
Writer<'a, 'c>
Writer.apply
x >>= f
'a -> Writer<'b, 'c>
Writer<'b, 'a>
Writer<'b, 'c>
Writer.bind
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