Void

Void

null

BaseFragment

@Parcelize

log.d("...")

interface Log {
    fun setup()
    fun v(message: String)
    fun d(message: String)
    fun i(message: String)
    fun w(message: String)
    fun e(message: String)
}

const val

companion object {
   //both these aren't constant expressions to compiler 
   const val LOG_TAG1 = this.javaClass.simpleName
   const val LOG_TAG2 = MainActivity::class.simpleName!!
}

buildscript {
    ext["kotlin_version"] = "1.3.21"
    repositories {
        google()
        jcenter()

    }
    dependencies {
        classpath("com.android.tools.build:gradle:3.4.0")
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${ext["kotlin_version"]}")
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()

    }
}

task<Delete>("clean") {
    delete(rootProject.buildDir)
}

Script compilation errors:

  Line 04:     ext["kotlin_version"] = "1.3.21"
               ^ Unresolved reference: ext

  Line 12:         classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${ext["kotlin_version"]}")
                                                                          ^ Unresolved reference: ext

2 errors