either 1.5.0

The enum `Either` with variants `Left` and `Right` is a general purpose sum type with two cases.

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.