Internal error: NoSuchElementException in TrailingCommaRule when using --experimental

[valentjn]

Expected Behavior

ktlint doesn't crash with an internal error.

Observed Behavior

ktlint crashes with an internal error when running on a specific file due to a NoSuchElementException in TrailingCommaRule when using --experimental.

Steps to Reproduce

1. In an empty folder, create a file Test.kt with the following contents:

class Test {
  var foo = Bar()
    set(value) {
    }
}

2. Run ktlint --experimental --debug Test.kt.
3. ktlint produces an output similar to the following:

[DEBUG] Discovered ruleset with " standard" id.
[DEBUG] Discovered ruleset with "experimental" id.
[DEBUG] Discovered reporter with "baseline" id.
[DEBUG] Discovered reporter with "checkstyle" id.
[DEBUG] Discovered reporter with "json" id.
[DEBUG] Discovered reporter with "html" id.
[DEBUG] Discovered reporter with "plain" id.
[DEBUG] Discovered reporter with "sarif" id.
[DEBUG] Initializing "plain" reporter with {verbose=false, color=false, color_name=DARK_GRAY}
[DEBUG] Checking D:\tmp\Test.kt
Resolving .editorconfig files for D:\tmp\Test.kt file path
Loaded .editorconfig: []
[DEBUG] Internal Error (experimental:trailing-comma)
com.pinterest.ktlint.core.RuleExecutionException: java.util.NoSuchElementException: Sequence contains no 
element matching the predicate.
        at com.pinterest.ktlint.core.KtLint$lint$1.invoke(KtLint.kt:166)
        at com.pinterest.ktlint.core.KtLint$lint$1.invoke(KtLint.kt:147)
        at com.pinterest.ktlint.core.KtLint$visitor$2$3.invoke(KtLint.kt:317)
        at com.pinterest.ktlint.core.KtLint$visitor$2$3.invoke(KtLint.kt:315)
        at com.pinterest.ktlint.core.ast.PackageKt.visit(package.kt:229)
        at com.pinterest.ktlint.core.ast.PackageKt.visit(package.kt:230)
        at com.pinterest.ktlint.core.ast.PackageKt.visit(package.kt:230)
        at com.pinterest.ktlint.core.ast.PackageKt.visit(package.kt:230)
        at com.pinterest.ktlint.core.ast.PackageKt.visit(package.kt:230)
        at com.pinterest.ktlint.core.ast.PackageKt.visit(package.kt:230)
        at com.pinterest.ktlint.core.KtLint$visitor$2.invoke(KtLint.kt:315)
        at com.pinterest.ktlint.core.KtLint$visitor$2.invoke(KtLint.kt:293)
        at com.pinterest.ktlint.core.KtLint.lint(KtLint.kt:147)
        at com.pinterest.ktlint.internal.FileUtilsKt.lintFile(FileUtils.kt:172)
        at com.pinterest.ktlint.KtlintCommandLine.process(Main.kt:395)
        at com.pinterest.ktlint.KtlintCommandLine.access$process(Main.kt:89)
        at com.pinterest.ktlint.KtlintCommandLine$lintFiles$3.invoke$lambda-0(Main.kt:289)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)     
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)     
        at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.util.NoSuchElementException: Sequence contains no element matching the predicate.        
        at com.pinterest.ktlint.ruleset.experimental.trailingcomma.TrailingCommaRule.visitValueList(TrailingCommaRule.kt:357)
        at com.pinterest.ktlint.ruleset.experimental.trailingcomma.TrailingCommaRule.visit(TrailingCommaRule.kt:61)
        at com.pinterest.ktlint.core.KtLint$lint$1.invoke(KtLint.kt:154)
        ... 20 more
D:\tmp\Test.kt:3:9: Internal Error (experimental:trailing-comma). Please create a ticket at https://github.com/pinterest/ktlint/issues (if possible, please re-run with the --debug flag to get the stacktrace and provide the source code that triggered an error) (cannot be auto-corrected)
[DEBUG] 1625ms / 1 file(s) / 1 error(s)

Additional Information

I was just migrating my project ltex-ls to use the new trailing-comma rules when I discovered this. However, the bug occurs even if the trailing-comma rules have not been enabled (no .editorconfig file or trailing-comma rules explicitly set to false). It suffices to use --experimental to trigger the bug.

Your Environment

• Version of ktlint used: 0.43.0
• Name and version (or code for custom task) of integration used (Gradle plugin, Maven plugin, command line, custom Gradle task): Command-line ktlint
• Version of Gradle used (if applicable): N/A
• Operating System and version: Windows 10
• Link to your project (if it's a public repository): https://github.com/valentjn/ltex-ls (but you obviously won't find the example code there)