swift --help doesn't show -language-mode option

[ole]

I wasn't sure whether to file this issue here in the driver repo or under swiftlang/swift. Apologies if this is the wrong place.

I noticed that the Swift 6.1 compiler doesn't show the renamed -language-mode option in its --help output. Instead, it still displays the old -swift-version option. The accepted proposal SE-0441 specifies the reverse:

The -language-mode option will be presented in the compiler help.

The -swift-version option will be suppressed from the top-level help of the compiler.

Here's the output I'm getting from Swift 6.1 (tested on macOS 15.4.1 with the toolchain that ships with Xcode 16.3).

$ swift --version
swift-driver version: 1.120.5 Apple Swift version 6.1 (swiftlang-6.1.0.110.21 clang-1700.0.13.3)
Target: arm64-apple-macosx15.0

# Searching for the term "language" shows the old -swift-version option,
# but not the new -language-mode.
$ swift --help | grep -i language
                          Disable a feature that will be introduced in an upcoming language version
                          Enable a feature that will be introduced in an upcoming language version
  -locale <locale-code>   Choose a language for diagnostic messages
  -swift-version <vers>   Interpret input according to a specific Swift language version number
  -warn-concurrency       Warn about code that is unsafe according to the Swift Concurrency model and will become ill-formed in a future language version

Note that swiftc -frontend --help does show the option (it still shows -swift-version too, contradicting SE-0441):

$ swift -frontend --help | grep -i -- language
…
  -language-mode <mode>   Interpret input according to a specific Swift language mode
…
  -swift-version <vers>   Interpret input according to a specific Swift language version number
…

As far as I can tell, the relevant pull requests have been merged long ago:

• SE-0441: Add language-mode option with alias to swift-version swift#75564
• Update Options.swift with SE-0441 language-mode option #1686

Is something else needed to release these changes to the driver and not just the frontend?

cc @dempseyatgithub in case you're interested.