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type optionBuilder() =
member __.Bind(opt, f) = Option.bind f opt
member __.Bind(obj, f) = Option.bind f (Option.ofObj obj)
member __.Bind(obj, f) = Option.bind f (Option.ofObj (box obj))
member __.Bind(obj, f) = Option.bind f (Option.ofNullable obj)
member __.Return x = Some x
member __.ReturnFrom x = x
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type OptionBuilder with
без ничего — он сделает это обычными мемберамиA
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