Github user apocolipse commented on the issue:
https://github.com/apache/thrift/pull/1084
Update:
I've modified the generated Async clients to use a new `TAsyncResult<T>`
parameter for callbacks rather than Optional Return/Error tuples. Short
version of why is that those parameters are always mutually exclusive, and
there's no really good way to have a non-optional return or throw pattern for
async.
With the `TAsyncResult<T>`, non-optional return values are encapsulated
within a throwing func in the enum, such that you can handle your do/catch
block in a callback. Consider the following example:
```swift
/// normal: public func hello() throws -> String
do {
let world = try hello()
} catch let e { handle(e) }
/// async: public func hello(completion: @escaping (TAsyncResult<String>)
-> Void)
hello() {
do {
let world = try $0.value()
catch let e { handle(e) }
}
```
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