util: Implement Layer
for Either<A, B>
#531
Merged
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I ran into a use case for this today which meant I had to make my own
Either
type. I guess makes sense for Tower to provide this directly.My use case was that I wanted to optionally apply some layer depending on some config. I had an
Option<T>
which I wanted to map into aEither<LayerUsingT, Identity>
and then treat that as aLayer
in a larger stack.