Unable to enable background indexing as per instructions

[tonyarnold]

Swift version

swift-driver version: 1.110 Apple Swift version 6.0 (swiftlang-6.0.0.4.52 clang-1600.0.21.1.3)

Platform

macOS 14.5

Editor

Visual Studio Code with Swift extension version v1.10.3

Does the issue reproduce with Swift 6?

Yes

Description

I'm unable to start SourceKit LSP from within VSCode.

Steps to Reproduce

I followed the instructions at https://github.com/apple/sourcekit-lsp/blob/main/Documentation/Enable%20Experimental%20Background%20Indexing.md

Now I get the following error within VSCode:

[Error - 20:28:54] SourceKit Language Server client: couldn't create connection to server.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
Error: Unknown option '--experimental-feature'
Usage: source-kit-lsp <options> <subcommand>
  See 'source-kit-lsp --help' for more information.
[Error - 20:28:54] Server process exited with code 64.
[Error - 20:28:54] Server initialization failed.
  Message: Pending response rejected since connection got disposed
  Code: -32097 

Logging

sourcekit-lsp-diagnose-2024-06-27T20-37-58+10-00.zip

[ahoppen]

Hey @tonyarnold,

Could it be that you didn’t set swift.path in VS Code to point to the installed toolchain?

[tonyarnold]

It looks like it was because I was using the version included with Xcode 16 beta 2. Using a nightly toolchain works fine.

[ahoppen]

That's good to hear. If you see any issues with background indexing, please let me know.