In IntelliJ IDEA 2026.2.0.1, the Kotlin plugin now...

# intellij

[Loïc Lamarque]

In IntelliJ IDEA 2026.2.0.1, the Kotlin plugin now reports a diagnostic unrelated to the missing JvmInline annotation. Is it a regression or an intentional change?

The code uses Kotlin 2.2.21, and the IDE uses Kotlin plugin version 262.8665.337-IJ.

[Tanja Stojiljkovic]

I checked the same code with the standalone Kotlin 2.2.20 CLI compiler, and it still reports:
value classes without '@JvmInline' annotation are not yet supported.
So I couldn't reproduce the FullValueClasses diagnostic outside the IDE. I also wasn't able to find a matching KTIJ issue, so this looks worth reporting if there aren't any additional language/compiler settings involved.

[Loïc Lamarque]

@Tanja Stojiljkovic I did the same check with Kotlin 2.2.21 compiler and it reports the right diagnostic (Value classes without '@JvmInline' annotation are not yet supported.). Where can I report this IDE problem?

[CLOVIS]

@Loïc Lamarque youtrack.jetbrains.com/issues/KTIJ

[Loïc Lamarque]

Issue created: KTIJ-39924.