use addDisposableTo method can not make a warning

[dakeshi]

Short description of the issue:
When I search some tutorials about RxSwift, I find out so many sample codes still use deprecated addDisposableTo method instead of disposed(by:). I think that the main reason is a missing warning message.

Deprecated addDisposableTo method can not make a warning during a build time. To show a warning and avoid an old method, it need to comment out in Deprecated.swift.

/// **@available(\*, deprecated, message="use disposed(by:) instead")** 

Um. it is not the correct statement. It should be:

@available(*, deprecated, message: "use disposed(by:) instead")

Expected outcome:

show a warning to avoid to use deprecated method

What actually happens:

no warning.

RxSwift/RxCocoa/RxBlocking/RxTest version/commit

3.6.1

Platform/Environment

• iOS
• macOS
• tvOS
• watchOS
• playgrounds

How easy is to reproduce? (chances of successful reproduce after running the self contained code)

• easy, 100% repro
• sometimes, 10%-100%
• hard, 2% - 10%
• extremely hard, %0 - 2%

Xcode version:

9.0

Installation method:

• CocoaPods
• Carthage
• Git submodules

I have multiple versions of Xcode installed:
(so we can know if this is a potential cause of your issue)

• yes (which ones)
• no

Level of RxSwift knowledge:
(this is so we can understand your level of knowledge
and formulate the response in an appropriate manner)

• just starting
• I have a small code base
• I have a significant code base

[kzaher]

Hi @dakeshi ,

Thnx for reporting this. We haven't been able to deprecate this for 3.x release, but we've deprecated it now in 4.x.