ksp: Regression: Types no longer validating

Consider the following class definition (taken from this file)

@Converter(
    names = ["j8Duration"],
    types = [ConverterType.DEFAULTING, ConverterType.OPTIONAL, ConverterType.SINGLE],
    imports = ["java.time.*"],

    builderFields = [
        "public var longHelp: Boolean = true",
        "public var positiveOnly: Boolean = true",
    ],
)
public class J8DurationConverter(
    public val longHelp: Boolean = true,
    public val positiveOnly: Boolean = true,
    override var validator: Validator<ChronoContainer> = null
) : SingleConverter<ChronoContainer>() {

KSP will happily parse this under Kotlin 1.6.10, using version 1.6.10-1.0.4. There are no issues.

Under Kotlin 1.6.20 and KSP 1.6.20-1.0.5, this class no longer validates - attempting to get the super types will result in a list with a single <Error object> entry. Even worse, this seems to sporadically only happens on a clean build - running build again right after will sometimes result in validation passing perfectly, and the output being generated correctly.

I have a bunch of classes that are structured the same way and are generally quite similar that parse just fine under 1.0.5. Some examples are below, but everything in the same directory works perfectly. Click here for the annotation processor code.

Working:

• ColorConverter
• EnumConverter
• RegexConverter

Broken:

• J8DurationCoalescingConverter and J8DurationConverter
• MappingsVersionConverter
• T4JDurationCoalescingConverter and T4JDurationConverter

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This makes absolutely no sense to me whatsoever. I can’t see any significant differences, and I’m entirely out of ideas. For the time being, I’ve pushed a copy of the repo using last known working versions of Kotlin and KSP, simply updating them will cause this issue.

Since I really don’t know how to dig further, I’ve pushed a branch which exhibits this issue. Simply clone it and run gradlew build.