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What is that return type, with the pipes and the tilde?
It's a monad, a bit like `Try`, which encodes all possible error types, a bit like typelevel checked exceptions. The pipes are aliases which construct an intersection type, which allows the types to match if they're reordered.
It means that I'm forced to handle all those error types. The tilde is a way of keeping a working set-algebra on the types, covering the case where the set of types may be empty.
I'd love a gist or a tiny blog post with your Result error encoding 
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