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The enum Either with variants Left and Right is a general purpose
sum type with two cases.
Either has methods that are similar to Option and Result, and it also implements
traits like Iterator.
Includes macros try_left!() and try_right!() to use for
short-circuiting logic, similar to how the ? operator is used with Result.
Note that Either is general purpose. For describing success or error, use the
regular Result.