Compiler plugin not being called

I have created a Kotlin compiler plugin (following this video):


And corresponding Gradle plugin:

The output log shows that the Gradle plugin is being invoked and processed correctly; the -Xplugin argument points to the KludgeCompiler jar and there is a -P plugin:kludge:onByDefault=true argument passed, without any sort of manual configuration. However there is no output from the compiler plugin (despite peppering some printlns around) and the output class files are not transformed at all.

Can anyone help?

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