[Spec tests] Fix test cases structure

compiler/tests-spec/testData/diagnostics/linked/declarations/classifier-declaration/class-declaration/abstract-classes/p-2/neg/1.1.kt

@@ -11,9 +11,10 @@
  * DESCRIPTION: Abstract classes may contain one or more abstract members, which should be implemented in a subtype of this abstract class
  */
 
-// TESTCASE NUMBER: 1
+// FILE: TestCase1.kt
-
+// TESTCASE NUMBER:1
-<!REDUNDANT_MODIFIER!>open<!>     abstract class Base {
+package testPackCase1
+<!REDUNDANT_MODIFIER!>open<!> abstract class Base {
 
     abstract val a: Any
     abstract var b: Any
@@ -24,22 +25,34 @@
     abstract fun foo()
     internal abstract fun boo(): Any
 }
-
 fun case1() {
-    val impl = BaseImplCase2(1, "1", 1.0)
+    val impl = BaseImplCase1(1, "1", 1.0)
 }
 
-class BaseImplCase2(
+class BaseImplCase1(
     override var a: Any, override
     <!VAR_OVERRIDDEN_BY_VAL!>val<!>  b: Any, override var c: Any, override
 
- <!VAR_OVERRIDDEN_BY_VAL!>val<!>  d: Any = "5") : Base()
+    <!VAR_OVERRIDDEN_BY_VAL!>val<!>  d: Any = "5") : Base()
 {
     override fun foo() {}
     override internal fun boo() {}
 }
 
+// FILE: TestCase2.kt
 // TESTCASE NUMBER: 2
+package testPackCase2
+<!REDUNDANT_MODIFIER!>open<!> abstract class Base {
+
+    abstract val a: Any
+    abstract var b: Any
+    internal abstract val c: Any
+    internal abstract var d: Any
+
+
+    abstract fun foo()
+    internal abstract fun boo(): Any
+}
 
 fun case2() {
     val impl = ImplBaseCase2()
@@ -68,10 +81,22 @@ class ImplBaseCase2() : Base() {
     }
 }
 
-/*
+// FILE: TestCase.kt
-* TESTCASE NUMBER: 3
+// TESTCASE NUMBER: 3
-* NOTE: property is not implemented
+
-*/
+package testPackCase3
+<!REDUNDANT_MODIFIER!>open<!> abstract class Base {
+
+    abstract val a: Any
+    abstract var b: Any
+    internal abstract val c: Any
+    internal abstract var d: Any
+
+
+    abstract fun foo()
+    internal abstract fun boo(): Any
+}
+
 fun case3() {
     ImplBaseCase3()
 }
@@ -95,10 +120,21 @@ fun case3() {
     }
 }
 
-/*
+// FILE: TestCase.kt
-* TESTCASE NUMBER: 4
+// TESTCASE NUMBER: 4
-* NOTE: function is not implemented
+package testPackCase4
-*/
+<!REDUNDANT_MODIFIER!>open<!> abstract class Base {
+
+    abstract val a: Any
+    abstract var b: Any
+    internal abstract val c: Any
+    internal abstract var d: Any
+
+
+    abstract fun foo()
+    internal abstract fun boo(): Any
+}
+
 
 fun case4() {
     ImplBaseCase4()
@@ -125,4 +161,4 @@ fun case4() {
 * TESTCASE NUMBER: 5
 * NOTE: incompatible modifiers final and abstract
 */
-<!INCOMPATIBLE_MODIFIERS!>final<!>   <!INCOMPATIBLE_MODIFIERS!>abstract<!>   class Case5() {}
+<!INCOMPATIBLE_MODIFIERS!>final<!> <!INCOMPATIBLE_MODIFIERS!>abstract<!> class Case5() {}

compiler/tests-spec/testData/diagnostics/linked/declarations/classifier-declaration/class-declaration/abstract-classes/p-2/neg/1.2.kt

@@ -11,7 +11,9 @@
  * DESCRIPTION: Abstract classes may contain abstract members, which should be implemented in an anonymous class that inherits from that abstract type
  */
 
+// FILE: TestCase.kt
 // TESTCASE NUMBER: 1
+package testPackCase1
 private abstract class Base {
 
     abstract val a: Any
@@ -24,7 +26,6 @@ private abstract class Base {
     internal abstract fun boo(): Any
 }
 
-
 fun case1() {
     val impl = object : Base() {
         override var a: Any
@@ -47,11 +48,26 @@ fun case1() {
 }
 
 
-
+// FILE: TestCase.kt
 /*
-* TESTCASE NUMBER: 2
+ * TESTCASE NUMBER: 2
-* NOTE: property is not implemented
+ * NOTE: property is not implemented
-*/
+ */
+package testPackCase2
+private abstract class Base {
+
+    abstract val a: Any
+    abstract var b: Any
+    internal abstract val c: Any
+    internal abstract var d: Any
+
+
+    abstract fun foo()
+    internal abstract fun boo(): Any
+}
+
+
+
 fun case2() {
     val impl = <!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED!>object<!> : Base() {
         override var b: Any
@@ -74,10 +90,20 @@ fun case2() {
 }
 
 
-/*
+// FILE: TestCase.kt
-* TESTCASE NUMBER: 3
+// TESTCASE NUMBER: 3
-* NOTE: function is not implemented
+package testPackCase3
-*/
+private abstract class Base {
+
+    abstract val a: Any
+    abstract var b: Any
+    internal abstract val c: Any
+    internal abstract var d: Any
+
+
+    abstract fun foo()
+    internal abstract fun boo(): Any
+}
 
 fun case3() {
     val impl = <!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED!>object<!> : Base() {

compiler/tests-spec/testData/diagnostics/linked/declarations/classifier-declaration/class-declaration/abstract-classes/p-2/neg/1.3.kt

@@ -11,7 +11,9 @@
  * DESCRIPTION: attempt to implement abstract members with invalid types
  */
 
+// FILE: TestCase.kt
 // TESTCASE NUMBER: 1
+package testPackCase1
 abstract class Base {
     abstract val a: CharSequence
     abstract var b: CharSequence
@@ -34,9 +36,16 @@ class Case1 : Base() {
 }
 
 
-/*
+
-* TESTCASE NUMBER: 2
+// FILE: TestCase.kt
-*/
+// TESTCASE NUMBER: 2
+package testPackCase2
+abstract class Base {
+    abstract val a: CharSequence
+    abstract var b: CharSequence
+
+    abstract fun foo(): CharSequence
+}
 
 class Case2(override val a: String, override var b: <!VAR_TYPE_MISMATCH_ON_OVERRIDE!>String<!>) : Base() {
     override fun foo(): <!RETURN_TYPE_MISMATCH_ON_OVERRIDE!>CharSequence?<!> {
@@ -44,10 +53,16 @@ class Case2(override val a: String, override var b: <!VAR_TYPE_MISMATCH_ON_OVERR
     }
 }
 
-/*
+// FILE: TestCase.kt
-* TESTCASE NUMBER: 3
+// TESTCASE NUMBER: 3
-* NOTE: abstract nested class members are not implemented
+package testPackCase3
-*/
+abstract class Base {
+    abstract val a: CharSequence
+    abstract var b: CharSequence
+
+    abstract fun foo(): CharSequence
+}
+
 
 class Case3 {
     <!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED!>class ImplBase1<!> : MainClass.Base1() {}

compiler/tests-spec/testData/diagnostics/linked/declarations/classifier-declaration/class-declaration/abstract-classes/testsMap.json

@@ -64,7 +64,7 @@
         },
         {
           "specVersion": "0.1-213",
-          "casesNumber": 1,
+          "casesNumber": 3,
           "description": "Abstract classes may contain abstract members, which should be implemented in an anonymous class that inherits from that abstract type",
           "path": "compiler/tests-spec/testData/diagnostics/linked/declarations/classifier-declaration/class-declaration/abstract-classes/p-2/neg/1.2.kt",
           "unexpectedBehaviour": false,
@@ -72,7 +72,7 @@
         },
         {
           "specVersion": "0.1-213",
-          "casesNumber": 1,
+          "casesNumber": 3,
           "description": "attempt to implement abstract members with invalid types",
           "path": "compiler/tests-spec/testData/diagnostics/linked/declarations/classifier-declaration/class-declaration/abstract-classes/p-2/neg/1.3.kt",
           "unexpectedBehaviour": false,
@@ -128,7 +128,7 @@
         },
         {
           "specVersion": "0.1-213",
-          "casesNumber": 2,
+          "casesNumber": 4,
           "description": "Abstract classes may contain one or more abstract members, which should be implemented in a subtype of this abstract class",
           "path": "compiler/tests-spec/testData/diagnostics/linked/declarations/classifier-declaration/class-declaration/abstract-classes/p-2/neg/1.1.kt",
           "unexpectedBehaviour": false,

compiler/tests-spec/testData/diagnostics/linked/expressions/built-in-types-and-their-semantics/kotlin.nothing-1/p-1/pos/1.1.kt

@@ -11,12 +11,11 @@
  * DESCRIPTION: check the type of jump expressions is Nothing and code placed on the left side of expression will never be executed
  */
 
-
 // TESTCASE NUMBER: 1
 
 fun case1() {
     var name: Any? = null
-    val men = arrayListOf(Person("Phill"), Person(), Person("Bob"))
+    val men = arrayListOf(Person1("Phill"), Person1(), Person1("Bob"))
     for (k in men) {
         k.name
         loop@ for (i in men) {
@@ -31,13 +30,13 @@ fun case1() {
     val a = 1
 }
 
-class Person(var name: String? = null) {}
+class Person1(var name: String? = null) {}
 
 // TESTCASE NUMBER: 2
 
 fun case2() {
     var name: Any? = null
-    val men = arrayListOf(Person("Phill"), Person(), Person("Bob"))
+    val men = arrayListOf(Person2("Phill"), Person2(), Person2("Bob"))
     for (k in men) {
         loop@ for (i in men) {
             i.name
@@ -51,6 +50,8 @@ fun case2() {
     val a = 1
 }
 
+class Person2(var name: String? = null) {}
+
 // TESTCASE NUMBER: 3
 
 fun case3() {

compiler/tests-spec/testData/diagnostics/linked/expressions/built-in-types-and-their-semantics/kotlin.unit/p-1/pos/1.1.kt

@@ -42,11 +42,11 @@ fun case2() {
 }
 
 // TESTCASE NUMBER: 3
-interface Processable<T> {
+interface ProcessableCase3<T> {
     fun process(): T
 }
 
-class Processor : Processable<Unit> {
+class Processor : ProcessableCase3<Unit> {
     override fun process() {
         val proc = "case 3"
     }
@@ -58,6 +58,10 @@ fun case3() {
 }
 
 // TESTCASE NUMBER: 4
+interface Processable<T> {
+    fun process(): T
+}
+
 fun case4() {
     val p2 = object : Processable<Unit> {
         override fun process() {

compiler/tests-spec/testData/diagnostics/linked/expressions/comparison-expressions/p-5/pos/1.1.kt

@@ -14,28 +14,38 @@
  * HELPERS: checkType
  */
 
-class A(val a: Int)  {
+
-    var isCompared = false
-    operator fun compareTo(other: A): Int = run {
-        isCompared = true
-        this.a - other.a
-    }
-}
 
 // TESTCASE NUMBER: 1
 fun case1() {
-    val a1 = A(-1)
+    val a1 = A1(-1)
-    val a2 = A(-3)
+    val a2 = A1(-3)
 
     val x = a1 < a2
 
     x checkType { check<Boolean>() }
 }
 
+class A1(val a: Int)  {
+    var isCompared = false
+    operator fun compareTo(other: A1): Int = run {
+        isCompared = true
+        this.a - other.a
+    }
+}
+
 // TESTCASE NUMBER: 2
+class A2(val a: Int)  {
+    var isCompared = false
+    operator fun compareTo(other: A2): Int = run {
+        isCompared = true
+        this.a - other.a
+    }
+}
+
 fun case2() {
-    val a1 = A(-1)
+    val a1 = A2(-1)
-    val a2 = A(-3)
+    val a2 = A2(-3)
 
     val x = a1 > a2
 
@@ -44,20 +54,36 @@ fun case2() {
 
 // TESTCASE NUMBER: 3
 fun case3() {
-    val a1 = A(-1)
+    val a1 = A3(-1)
-    val a2 = A(-3)
+    val a2 = A3(-3)
 
     val x = a1 <= a2
 
     x checkType { check<Boolean>() }
 }
 
+class A3(val a: Int)  {
+    var isCompared = false
+    operator fun compareTo(other: A3): Int = run {
+        isCompared = true
+        this.a - other.a
+    }
+}
+
 // TESTCASE NUMBER: 4
 fun case4() {
-    val a1 = A(-1)
+    val a1 = A4(-1)
-    val a2 = A(-3)
+    val a2 = A4(-3)
 
     val x = a1 >= a2
 
     x checkType { check<Boolean>() }
 }
+
+class A4(val a: Int)  {
+    var isCompared = false
+    operator fun compareTo(other: A4): Int = run {
+        isCompared = true
+        this.a - other.a
+    }
+}

compiler/tests-spec/testData/diagnostics/linked/expressions/constant-literals/boolean-literals/p-1/pos/2.1.kt

@@ -13,6 +13,8 @@
  * HELPERS: checkType
  */
 
+// FILE: TestCases.kt
+
 // TESTCASE NUMBER: 1
 
 fun case1() {
@@ -59,7 +61,12 @@ interface `true`{}
 interface `false`{}
 
 
+// FILE: TestCase7.kt
 // TESTCASE NUMBER: 7
+package testPackCase7c
+
+interface `true`{}
+interface `false`{}
 
 fun case7() {
     class `true` : `false`{}

compiler/tests-spec/testData/diagnostics/linked/expressions/equality-expressions/value-equality-expressions/p-3/pos/1.1.kt

@@ -13,7 +13,6 @@
  * DESCRIPTION: Value equality expressions always have type kotlin.Boolean as does the equals method in kotlin.Any
  * HELPERS: checkType
  */
-data class A(val a: Boolean)
 
 
 // TESTCASE NUMBER: 1
@@ -22,12 +21,16 @@ fun case1() {
     x checkType { check<Boolean>() }
 }
 
+data class A(val a: Boolean)
+
 // TESTCASE NUMBER: 2
 fun case2() {
-    val x = A(false) == A(false)
+    val x = A1(false) == A1(false)
     x checkType { check<Boolean>() }
 }
 
+data class A1(val a: Boolean)
+
 // TESTCASE NUMBER: 3
 fun case3() {
     val x = true == false

compiler/tests-spec/testData/diagnostics/linked/expressions/jump-expressions/p-2/pos/1.1.kt

@@ -12,6 +12,8 @@
  * DESCRIPTION: check he type of jump expressions is the kotlin.Nothing
  */
 
+
+
 // TESTCASE NUMBER: 1
 
 fun case1() {
@@ -27,14 +29,13 @@ fun case1() {
         <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.String")!>s<!>
     }
 }
-
 class Person(var name: String? = null) {}
 
 // TESTCASE NUMBER: 2
 
 fun case2() {
     var name: Any? = null
-    val men = arrayListOf(Person("Phill"), Person(), Person("Bob"))
+    val men = arrayListOf(Person2("Phill"), Person2(), Person2("Bob"))
     for (k in men) {
         loop@ for (i in men) {
             val val1 = <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Nothing")!>continue@loop<!>
@@ -45,6 +46,8 @@ fun case2() {
     }
 }
 
+class Person2(var name: String? = null) {}
+
 // TESTCASE NUMBER: 3
 
 fun case3() {

compiler/tests-spec/testData/diagnostics/linked/expressions/prefix-expressions/prefix-decrement-expression/p-4/neg/1.1.kt

@@ -11,14 +11,7 @@
  * NUMBER: 1
  * DESCRIPTION: check unsafe prefix decrement expression call for an assignable expression
  */
-class A() {
-    var i = 0
 
-    operator fun dec(): A {
-        this.i--
-        return this
-    }
-}
 
 // TESTCASE NUMBER: 1
 
@@ -32,6 +25,15 @@ class Case1() {
     var a: A = A()
 }
 
+class A() {
+    var i = 0
+
+    operator fun dec(): A {
+        this.i--
+        return this
+    }
+}
+
 // TESTCASE NUMBER: 2
 
 fun case2() {
@@ -40,5 +42,14 @@ fun case2() {
 }
 
 class Case2() {
-    val a = A()
+    val a = A2()
+}
+
+class A2() {
+    var i = 0
+
+    operator fun dec(): A2 {
+        this.i--
+        return this
+    }
 }

compiler/tests-spec/testData/diagnostics/linked/expressions/prefix-expressions/prefix-increment-expression/p-4/neg/1.1.kt

@@ -11,6 +11,12 @@
  * NUMBER: 1
  * DESCRIPTION: check unsafe prefix increment expression call for an assignable expression
  */
+
+
+// FILE: TestCase.kt
+// TESTCASE NUMBER: 1
+package testPackCase1
+
 class A() {
     var i = 0
 
@@ -20,8 +26,6 @@ class A() {
     }
 }
 
-// TESTCASE NUMBER: 1
-
 fun case1() {
     var b: Case1? = Case1()
     <!UNSAFE_CALL!>++<!>b?.a
@@ -32,7 +36,18 @@ class Case1() {
     var a: A = A()
 }
 
+// FILE: TestCase.kt
 // TESTCASE NUMBER: 2
+package testPackCase2
+
+class A() {
+    var i = 0
+
+    operator fun inc(): A {
+        this.i++
+        return this
+    }
+}
 
 fun case2() {
     var b= Case2()

compiler/tests-spec/testData/diagnostics/linked/expressions/try-expression/p-8/neg/1.1.kt

@@ -11,15 +11,22 @@
  * NUMBER: 1
  * DESCRIPTION: The type of the try-expression is the least upper bound of the types of the last expressions of the try body and the last expressions of all the catch blocks
  */
+
+// FILE: TestCase.kt
+// TESTCASE NUMBER: 1
+package testPackCase1
+
 fun throwExceptionA(b: Boolean) = run { if (b) throw ExcA() }
 
+class ExcA() : Exception()
+class ExcB() : Exception()
+
 open class A<T>(var data: T) {
     fun foo(d: A<T>) {}
 }
 
 class B<T>(data: T) : A<T>(data)
 
-// TESTCASE NUMBER: 1
 
 fun case1() {
     val tryVal: B<String> =
@@ -29,11 +36,24 @@ fun case1() {
     }<!> catch (e: Exception) {
         B("")
     }
-
-
 }
 
+// FILE: TestCase.kt
 // TESTCASE NUMBER: 2
+package testPackCase2
+
+fun throwExceptionA(b: Boolean) = run { if (b) throw ExcA() }
+
+class ExcA() : Exception()
+class ExcB() : Exception()
+
+open class A<T>(var data: T) {
+    fun foo(d: A<T>) {}
+}
+
+class B<T>(data: T) : A<T>(data)
+
+
 
 fun case2() {
     val tryVal: A<String> =
@@ -45,10 +65,20 @@ fun case2() {
     }<!>
 }
 
-/*
+
- * TESTCASE NUMBER: 3
+// FILE: TestCase.kt
- * ISSUES: KT-35494
+// TESTCASE NUMBER: 3
- */
+// ISSUES: KT-35494
+package testPackCase3
+
+fun throwExceptionA(b: Boolean) = run { if (b) throw ExcA() }
+
+open class A<T>(var data: T) {
+    fun foo(d: A<T>) {}
+}
+
+class B<T>(data: T) : A<T>(data)
+
 fun case3() {
     val tryVal: A<Int> =
     try {

compiler/tests-spec/testData/diagnostics/linked/expressions/type-checking-and-containment-checking-expressions/containment-checking-expression/p-5/pos/2.1.kt

@@ -13,6 +13,13 @@
  * HELPERS: checkType
  */
 
+
+// FILE: TestCase.kt
+// TESTCASE NUMBER: 1
+package testPackCase1
+import checkType
+import check
+
 class A(val a: Set<Any>) {
     operator fun contains(other: Any?): Boolean = run { this.a.contains(other) }
 
@@ -27,7 +34,6 @@ class C() {
     }
 }
 
-// TESTCASE NUMBER: 1
 fun case1() {
     val b = A(mutableSetOf(1, C(), 3, false, 2, "azaza"))
     val c = C()
@@ -35,14 +41,52 @@ fun case1() {
     a checkType { check<Boolean>() }
 }
 
+// FILE: TestCase.kt
 // TESTCASE NUMBER: 2
+package testPackCase2
+import checkType
+import check
+
+class A(val a: Set<Any>) {
+    operator fun contains(other: Any?): Boolean = run { this.a.contains(other) }
+
+    fun throwException(b: Boolean): A { if (b) throw Exception() else return this }
+}
+
+class C() {
+    var isEvaluated: Boolean = false
+    fun foo(): C {
+        this.isEvaluated = true
+        return this
+    }
+}
+
 fun case2() {
     val b = A(mutableSetOf(1, C(), 3, false, 2, "azaza"))
     val a = (null in b)
     a checkType { check<Boolean>() }
 }
 
+// FILE: TestCase.kt
 // TESTCASE NUMBER: 3
+package testPackCase3
+import checkType
+import check
+
+class A(val a: Set<Any>) {
+    operator fun contains(other: Any?): Boolean = run { this.a.contains(other) }
+
+    fun throwException(b: Boolean): A { if (b) throw Exception() else return this }
+}
+
+class C() {
+    var isEvaluated: Boolean = false
+    fun foo(): C {
+        this.isEvaluated = true
+        return this
+    }
+}
+
 fun case3() {
     val b = A(mutableSetOf(1, C(), 3, false, 2, "azaza"))
     val x  = ""
@@ -50,7 +94,26 @@ fun case3() {
     a checkType { check<Boolean>() }
 }
 
+// FILE: TestCase.kt
 // TESTCASE NUMBER: 4
+package testPackCase4
+import checkType
+import check
+
+class A(val a: Set<Any>) {
+    operator fun contains(other: Any?): Boolean = run { this.a.contains(other) }
+
+    fun throwException(b: Boolean): A { if (b) throw Exception() else return this }
+}
+
+class C() {
+    var isEvaluated: Boolean = false
+    fun foo(): C {
+        this.isEvaluated = true
+        return this
+    }
+}
+
 fun case4(nothing: Nothing) {
     val b = A(mutableSetOf(1, C(), 3, false, 2, "azaza"))
     val a = (nothing in b)

compiler/tests-spec/testData/diagnostics/linked/statements/assignments/operator-assignments/p-2/neg/1.1.kt

@@ -15,6 +15,12 @@
  */
 
 
+// TESTCASE NUMBER: 1
+fun case1() {
+    var b = B(1)
+    b <!ASSIGN_OPERATOR_AMBIGUITY!>+=<!> 1
+}
+
 class B(var a: Int) {
     operator fun plus(value: Int): B {
         a= a + value
@@ -24,9 +30,3 @@ class B(var a: Int) {
         a= a + value
     }
 }
-
-// TESTCASE NUMBER: 1
-fun case1() {
-    var b = B(1)
-    b <!ASSIGN_OPERATOR_AMBIGUITY!>+=<!> 1
-}

compiler/tests-spec/testData/diagnostics/linked/statements/assignments/operator-assignments/p-2/pos/1.1.kt

@@ -15,6 +15,11 @@
  * DESCRIPTION: An operator assignment A+=B
  */
 
+// TESTCASE NUMBER: 1
+fun case1() {
+    val b = B(1)
+    b += 1
+}
 
 class B(var a: Int) {
     operator fun plus(value: Int): B {
@@ -25,9 +30,3 @@ class B(var a: Int) {
         a= a + value
     }
 }
-
-// TESTCASE NUMBER: 1
-fun case1() {
-    val b = B(1)
-    b += 1
-}

compiler/tests-spec/testData/diagnostics/linked/type-system/type-kinds/built-in-types/kotlin.nothing/p-1/pos/1.1.kt

@@ -16,14 +16,16 @@
  */
 
 
-
+// FILE: TestCase1.kt
+// TESTCASE NUMBER: 1
+package testPackCase1
+import checkSubtype
 class NothingWrapper() {
     val data: Nothing = TODO()
 }
 
 class CustomClass() {}
 
-// TESTCASE NUMBER: 1
 fun case1() {
     val wrapper: NothingWrapper = NothingWrapper()
     checkSubtype<Any>(wrapper.data)
@@ -39,7 +41,16 @@ fun case1() {
     checkSubtype<CustomClass>(wrapper.data)
 }
 
+// FILE: TestCase2.kt
 // TESTCASE NUMBER: 2
+package testPackCase2
+import checkSubtype
+class NothingWrapper() {
+    val data: Nothing = TODO()
+}
+
+class CustomClass() {}
+
 fun case2(wrapper: NothingWrapper) {
     checkSubtype<MutableList<out Nothing>>(wrapper.data)
     checkSubtype<MutableList<in String>>(wrapper.data)
@@ -48,5 +59,4 @@ fun case2(wrapper: NothingWrapper) {
     checkSubtype<MutableList<Any?>>(wrapper.data)
 
     checkSubtype<String>(wrapper.data)
-
 }