val <T : Any> KClass<T>.primaryConstructor: KFunction<T>?
Platform and version requirements: Kotlin 1.1, JVM
Returns the primary constructor of this class, or null if this class has no primary constructor. See the Kotlin language documentation for more information.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect.full/primary-constructor.html