crash: typing a string interpolation anchor instantly crashes sourcekit-lsp

[tayloraswift]

opening the following SPM test project in vscode instantly crashes sourcekit-lsp:

sourcekit-lsp-crash-3.zip

public struct sourcekit_lsp_crash_3 {
    var description:String 
    {
        """
        \()
        """
    }
}

PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
[Info  - 4:56:02 PM] Connection to server got closed. Server will restart.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
[Info  - 4:56:02 PM] Connection to server got closed. Server will restart.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
[Info  - 4:56:03 PM] Connection to server got closed. Server will restart.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
[Info  - 4:56:03 PM] Connection to server got closed. Server will restart.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
[Error - 4:56:04 PM] The SourceKit Language Server server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.

vscode-swift-extension: v0.6.0

$ swiftenv version
DEVELOPMENT-SNAPSHOT-2022-08-01-a 
$ swift --version
Swift version 5.8-dev (LLVM 07d14852a049e40, Swift 613b3223d9ec5f6)
Target: x86_64-unknown-linux-gnu
$ code --version
1.69.2
3b889b090b5ad5793f524b5d1d39fda662b96a2a
x64

[ahoppen]

rdar://98304976

[ahoppen]

I just tried reproducing this and SourceKit-LSP isn’t crashing for me if I perform the following steps:

• Open the attached project
• Type test inside the parentheses of the string interpolation in sourcekit_lsp_crash_3.swift

Are there any other steps you perform to make SourceKit-LSP crash?

[tayloraswift]

if you type test inside the parentheses quickly enough, it will not crash, because the string interpolation anchor only crashes when it is empty.

if you leave the parentheses empty, it blinks 3 times, and then crashes.

i also upgraded to v0.7.0 of the vscode-swift extension, and it crashes as well.

[DavidGoldman]

I believe this should have been fixed by #602

[ahoppen]

@Kelvin13 Could you check if you are still seeing the issue with the most recent swift development snapshot?

[tayloraswift]

yep, this has been fixed! thank you!!