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Consider the following code:
let fnOption = Some (fun () -> ())
fnOption = None
It gives the following error:
init.fsx(2,1): error FS0001: The type ‘(unit -> unit)’ does not support the ‘equality’ constraint because it is a function type
Why is that? Did I overlook something?
If you really wanted to check for equality (and not to assign the value), then you can use
Option.isNone fnOption. If you really do want to assign, look as kvb’s answer.