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kotlinlang

i got the following error
"org.jetbrains.ktor.locations.Locations$WhenMappings does not contain a source debug information. All classes must be compiled with source and line number debug information"
i infer that $WhenMappings is created at compile time by the kotlin compiler
it is sourced from `when` statements
anyone know how i can compile using debug with the maven plugin
looking at the source doesn't enlighten me very much
<https://github.com/JetBrains/kotlin/blob/master/libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java>