Issue Description:

This code compiles normally, but if I uncomment one of the following print statements, or any other line, this will no longer compile, and throw the following error: Generic parameter 'T' could not be inferred

```
class Example {
static func test() {
Task.retry(task: { taskCompletion in
DispatchQueue.main.async {
//print("Uncomment me to throw error: Generic parameter 'T' could not be inferred")
taskCompletion(.success(()))
//print("Uncomment me to throw error: Generic parameter 'T' could not be inferred")
}
}, completion: { result in

switch result {
case .success:
print("success")
case .failure:
print("failure")
}
})
}
}

enum Task {
static func retry<T>(
task: @escaping (_ completion: @escaping (Result<T, Error>) -> Void) -> Void,
completion: @escaping (Result<T, Error>) -> Void
) {
task { result in
completion(result)
}
}
}
```