Re: [boost] [outcome] expected, etc. why are these assignable

Or you could use expected<T, E...>, assuming we decide this is a direction worth pursuing. Proof of concept here:

https://github.com/pdimov/variant2/blob/master/include/boost/variant2/expect...

Now with some preliminary documentation: https://github.com/pdimov/variant2/blob/develop/doc/expected.md