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Optional. For void functions the return type of a nonblocking call changes from Expected<future<Optional<bool>>> to Expected<future<Error>>, and for functions returning T the return type changes from Expected<future<Optional<T>>> to Expected<future<Expected<T>>>. Inner results need to be checked (since the RPC connection may have dropped out before a result came back) and Error/Expected provide stronger checking requirements. It also allows us drop the crufty 'optionalToError' function and just collapse Errors in the single-threaded call primitives. llvm-svn: 280016
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