enum class Gender {
    MALE, FEMALE
}

inline fun postInline(block: () -> Unit) = block()

fun post(block: () -> Unit) = block()

fun main(args: Array<String>) {
    postInline { enumValueOf<Gender>("MALE") }
    post { enumValueOf<Gender>("MALE") }
}

// The postInline {...} translates to:
LINENUMBER 19 L3
LDC "MALE"
ASTORE 1
ALOAD 1
INVOKESTATIC Gender.valueOf (Ljava/lang/String;)LGender;

// Whereas, post {...} translates to:
LINENUMBER 20 L9
INVOKESTATIC kotlin/jvm/internal/Intrinsics.needClassReification ()V
GETSTATIC NoCommitKt$main$2.INSTANCE : LNoCommitKt$main$2;
CHECKCAST kotlin/jvm/functions/Function0
INVOKESTATIC NoCommitKt.post (Lkotlin/jvm/functions/Function0;)V

Notice the Intrinsics.needClassReification() call