Generate function type parameter annotations and type annotations on their bounds into bytecode

Generate type parameter annotation by default for `-Xjvm-target 1.8` and above

 #KT-46539
 #KT-13228
 #KT-46545 Fixed

compiler/testData/codegen/asmLike/typeAnnotations/dontEmit.kt

@@ -0,0 +1,23 @@
+// KOTLIN_CONFIGURATION_FLAGS: -JVM.EMIT_JVM_TYPE_ANNOTATIONS
+// RENDER_ANNOTATIONS
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+package foo
+
+@Target(AnnotationTarget.TYPE)
+annotation class TypeAnn(val name: String)
+
+@Target(AnnotationTarget.TYPE_PARAMETER)
+annotation class TypeParameterAnn(val name: String)
+
+
+class Kotlin {
+
+    fun foo(s: @TypeAnn("1") String) {
+    }
+
+    fun <T : @TypeAnn("Ant") Any> bar(p: T): T {
+        return p
+    }
+
+}

compiler/testData/codegen/asmLike/typeAnnotations/dontEmit.txt

@@ -0,0 +1,19 @@
+public final class foo/Kotlin : java/lang/Object {
+    public void <init>()
+
+    <T:Ljava/lang/Object;>(TT;)TT;
+    public final java.lang.Object bar(java.lang.Object p)
+      @Lorg/jetbrains/annotations/NotNull;([]) // invisible
+        @Lorg/jetbrains/annotations/NotNull;([]) // invisible, parameter 0
+
+    public final void foo(java.lang.String s)
+        @Lorg/jetbrains/annotations/NotNull;([]) // invisible, parameter 0
+}
+
+public abstract interface foo/TypeAnn : java/lang/Object, java/lang/annotation/Annotation {
+    public abstract java.lang.String name()
+}
+
+public abstract interface foo/TypeParameterAnn : java/lang/Object, java/lang/annotation/Annotation {
+    public abstract java.lang.String name()
+}

compiler/testData/codegen/asmLike/typeAnnotations/functionTypeParameter.kt

@@ -0,0 +1,62 @@
+// IGNORE_BACKEND: JVM
+// KOTLIN_CONFIGURATION_FLAGS: +JVM.EMIT_JVM_TYPE_ANNOTATIONS
+// RENDER_ANNOTATIONS
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+package foo
+
+@Target(AnnotationTarget.TYPE)
+annotation class TypeAnn(val name: String)
+
+@Target(AnnotationTarget.TYPE)
+annotation class ClassTypeAnn(val name: String)
+
+@Target(AnnotationTarget.TYPE)
+@Retention(AnnotationRetention.BINARY)
+annotation class TypeAnnBinary
+
+@Target(AnnotationTarget.TYPE)
+@Retention(AnnotationRetention.SOURCE)
+annotation class TypeAnnSource
+
+@Target( AnnotationTarget.TYPE_PARAMETER)
+annotation class TypeParameterAnn(val name: String)
+
+@Target(AnnotationTarget.TYPE_PARAMETER)
+@Retention(AnnotationRetention.BINARY)
+annotation class TypeParameterAnnBinary
+
+@Target(AnnotationTarget.TYPE_PARAMETER)
+@Retention(AnnotationRetention.SOURCE)
+annotation class TypeParameterAnnSource
+
+interface Generic<Z>
+class GenericClass<Z>
+class B<Y>
+
+class Kotlin {
+
+    fun <@TypeParameterAnn("TP1") @TypeParameterAnnBinary @TypeParameterAnnSource T, @TypeParameterAnn("TP2") @TypeParameterAnnBinary @TypeParameterAnnSource T2> typeParameter() {
+    }
+
+    fun <@TypeParameterAnn("TP") T> genericParameterAndReturn(s: @TypeAnn("1") @TypeAnnBinary @TypeAnnSource T): @TypeAnn("2") @TypeAnnBinary @TypeAnnSource T {
+        return s
+    }
+
+    fun <@TypeParameterAnn("Y") Y, @TypeParameterAnn("T") T: @TypeAnn("Generic") @TypeAnnBinary @TypeAnnSource Generic<@TypeAnn("Generic Argument") @TypeAnnBinary @TypeAnnSource Y>> genericInterfaceBound() {
+    }
+
+    fun <@TypeParameterAnn("Y") Y, @TypeParameterAnn("T") T: @TypeAnn("Generic") @TypeAnnBinary @TypeAnnSource GenericClass<@TypeAnn("Generic Argument") @TypeAnnBinary @TypeAnnSource Y>> genericClassBound() {
+    }
+
+    fun <@TypeParameterAnn("Y") Y, @TypeParameterAnn("T") T: @TypeAnn("Generic") Generic<@TypeAnn("Generic Argument") Y>> whereClause() where T : @ClassTypeAnn("Any") Any {
+
+    }
+
+    fun <@TypeParameterAnn("Y") Y, @TypeParameterAnn("T") T: @TypeAnn("Y as Bound") @TypeAnnBinary @TypeAnnSource Y> typeParameterTypeParameterBound() {
+    }
+
+    // Second annotation is missed: see KT-46483, remove this test after prohibition of such cases
+    fun <@TypeParameterAnn("T") T: Any> whereClauseWithAnnotation() where @TypeParameterAnn("Additional")  T : Generic<String> {
+    }
+}

compiler/testData/codegen/asmLike/typeAnnotations/functionTypeParameter.txt

@@ -0,0 +1,98 @@
+<Y:Ljava/lang/Object;>Ljava/lang/Object;
+public final class foo/B : java/lang/Object {
+    public void <init>()
+}
+
+public abstract interface foo/ClassTypeAnn : java/lang/Object, java/lang/annotation/Annotation {
+    public abstract java.lang.String name()
+}
+
+<Z:Ljava/lang/Object;>Ljava/lang/Object;
+public abstract interface foo/Generic : java/lang/Object {
+
+}
+
+<Z:Ljava/lang/Object;>Ljava/lang/Object;
+public final class foo/GenericClass : java/lang/Object {
+    public void <init>()
+}
+
+public final class foo/Kotlin : java/lang/Object {
+    public void <init>()
+
+    <Y:Ljava/lang/Object;T:Lfoo/GenericClass<TY;>;>()V
+    public final void genericClassBound()
+      @Lfoo/TypeParameterAnn;([name="Y"]) : METHOD_TYPE_PARAMETER 0, null
+      @Lfoo/TypeParameterAnn;([name="T"]) : METHOD_TYPE_PARAMETER 1, null
+      @Lfoo/TypeAnn;([name="Generic"]) : METHOD_TYPE_PARAMETER_BOUND 1, 0, null
+      @Lfoo/TypeAnn;([name="Generic Argument"]) : METHOD_TYPE_PARAMETER_BOUND 1, 0, 0;
+      @Lfoo/TypeAnnBinary;([]) : METHOD_TYPE_PARAMETER_BOUND 1, 0, null // invisible
+      @Lfoo/TypeAnnBinary;([]) : METHOD_TYPE_PARAMETER_BOUND 1, 0, 0; // invisible
+
+    <Y:Ljava/lang/Object;T::Lfoo/Generic<TY;>;>()V
+    public final void genericInterfaceBound()
+      @Lfoo/TypeParameterAnn;([name="Y"]) : METHOD_TYPE_PARAMETER 0, null
+      @Lfoo/TypeParameterAnn;([name="T"]) : METHOD_TYPE_PARAMETER 1, null
+      @Lfoo/TypeAnn;([name="Generic"]) : METHOD_TYPE_PARAMETER_BOUND 1, 1, null
+      @Lfoo/TypeAnn;([name="Generic Argument"]) : METHOD_TYPE_PARAMETER_BOUND 1, 1, 0;
+      @Lfoo/TypeAnnBinary;([]) : METHOD_TYPE_PARAMETER_BOUND 1, 1, null // invisible
+      @Lfoo/TypeAnnBinary;([]) : METHOD_TYPE_PARAMETER_BOUND 1, 1, 0; // invisible
+
+    <T:Ljava/lang/Object;>(TT;)TT;
+    public final java.lang.Object genericParameterAndReturn(java.lang.Object s)
+      @Lfoo/TypeAnn;([name="2"]) : METHOD_RETURN, null
+      @Lfoo/TypeParameterAnn;([name="TP"]) : METHOD_TYPE_PARAMETER 0, null
+      @Lfoo/TypeAnn;([name="1"]) : METHOD_FORMAL_PARAMETER 0, null
+      @Lfoo/TypeAnnBinary;([]) : METHOD_RETURN, null // invisible
+      @Lfoo/TypeAnnBinary;([]) : METHOD_FORMAL_PARAMETER 0, null // invisible
+
+    <T:Ljava/lang/Object;T2:Ljava/lang/Object;>()V
+    public final void typeParameter()
+      @Lfoo/TypeParameterAnn;([name="TP1"]) : METHOD_TYPE_PARAMETER 0, null
+      @Lfoo/TypeParameterAnn;([name="TP2"]) : METHOD_TYPE_PARAMETER 1, null
+      @Lfoo/TypeParameterAnnBinary;([]) : METHOD_TYPE_PARAMETER 0, null // invisible
+      @Lfoo/TypeParameterAnnBinary;([]) : METHOD_TYPE_PARAMETER 1, null // invisible
+
+    <Y:Ljava/lang/Object;T::TY;>()V
+    public final void typeParameterTypeParameterBound()
+      @Lfoo/TypeParameterAnn;([name="Y"]) : METHOD_TYPE_PARAMETER 0, null
+      @Lfoo/TypeParameterAnn;([name="T"]) : METHOD_TYPE_PARAMETER 1, null
+      @Lfoo/TypeAnn;([name="Y as Bound"]) : METHOD_TYPE_PARAMETER_BOUND 1, 0, null
+      @Lfoo/TypeAnnBinary;([]) : METHOD_TYPE_PARAMETER_BOUND 1, 0, null // invisible
+
+    <Y:Ljava/lang/Object;T:Ljava/lang/Object;:Lfoo/Generic<TY;>;>()V
+    public final void whereClause()
+      @Lfoo/TypeParameterAnn;([name="Y"]) : METHOD_TYPE_PARAMETER 0, null
+      @Lfoo/TypeParameterAnn;([name="T"]) : METHOD_TYPE_PARAMETER 1, null
+      @Lfoo/TypeAnn;([name="Generic"]) : METHOD_TYPE_PARAMETER_BOUND 1, 1, null
+      @Lfoo/TypeAnn;([name="Generic Argument"]) : METHOD_TYPE_PARAMETER_BOUND 1, 1, 0;
+      @Lfoo/ClassTypeAnn;([name="Any"]) : METHOD_TYPE_PARAMETER_BOUND 1, 0, null
+
+    <T:Ljava/lang/Object;:Lfoo/Generic<Ljava/lang/String;>;>()V
+    public final void whereClauseWithAnnotation()
+      @Lfoo/TypeParameterAnn;([name="T"]) : METHOD_TYPE_PARAMETER 0, null
+}
+
+public abstract interface foo/TypeAnn : java/lang/Object, java/lang/annotation/Annotation {
+    public abstract java.lang.String name()
+}
+
+public abstract interface foo/TypeAnnBinary : java/lang/Object, java/lang/annotation/Annotation {
+
+}
+
+public abstract interface foo/TypeAnnSource : java/lang/Object, java/lang/annotation/Annotation {
+
+}
+
+public abstract interface foo/TypeParameterAnn : java/lang/Object, java/lang/annotation/Annotation {
+    public abstract java.lang.String name()
+}
+
+public abstract interface foo/TypeParameterAnnBinary : java/lang/Object, java/lang/annotation/Annotation {
+
+}
+
+public abstract interface foo/TypeParameterAnnSource : java/lang/Object, java/lang/annotation/Annotation {
+
+}

compiler/testData/codegen/asmLike/typeAnnotations/notYetSupported.kt

@@ -52,5 +52,7 @@ class Kotlin {
     fun <T> fooGenericOut(s: @Ann Bar<out @Ann2 T>) {
     }
 
+    fun <T: Bar<Outer.Inner<@Ann Outer>>> innerClassInBound() {
+    }
 
 }

compiler/testData/codegen/asmLike/typeAnnotations/notYetSupported.txt

@@ -58,6 +58,9 @@ public final class foo/Kotlin : java/lang/Object {
     public final void fooGenericOut(foo.Bar s)
       @Lfoo/Ann;([]) : METHOD_FORMAL_PARAMETER 0, null
         @Lorg/jetbrains/annotations/NotNull;([]) // invisible, parameter 0
+
+    <T:Lfoo/Bar<Lfoo/Outer$Inner<Lfoo/Outer;>;>;>()V
+    public final void innerClassInBound()
 }
 
 <T:Ljava/lang/Object;>Ljava/lang/Object;
@@ -70,4 +73,4 @@ public final class foo/Outer$Inner : java/lang/Object {
 
 public final class foo/Outer : java/lang/Object {
     public void <init>()
-}
+}

compiler/testData/codegen/asmLike/typeAnnotations/propertyTypeParameter.kt

@@ -0,0 +1,21 @@
+// IGNORE_BACKEND: JVM
+// KOTLIN_CONFIGURATION_FLAGS: +JVM.EMIT_JVM_TYPE_ANNOTATIONS
+// RENDER_ANNOTATIONS
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+package foo
+
+@Target(AnnotationTarget.TYPE)
+annotation class TypeAnn(val name: String)
+
+@Target( AnnotationTarget.TYPE_PARAMETER)
+annotation class TypeParameterAnn()
+
+interface Simple
+
+class Kotlin {
+
+    var <@TypeParameterAnn T: @TypeAnn("Simple") Simple> T.z: T?
+        get() = null
+        set(value) {}
+}

compiler/testData/codegen/asmLike/typeAnnotations/propertyTypeParameter.txt

@@ -0,0 +1,29 @@
+public final class foo/Kotlin : java/lang/Object {
+    public void <init>()
+
+    <T::Lfoo/Simple;>(TT;)TT;
+    public final foo.Simple getZ(foo.Simple $this$z)
+      @Lorg/jetbrains/annotations/Nullable;([]) // invisible
+      @Lfoo/TypeParameterAnn;([]) : METHOD_TYPE_PARAMETER 0, null
+      @Lfoo/TypeAnn;([name="Simple"]) : METHOD_TYPE_PARAMETER_BOUND 0, 1, null
+        @Lorg/jetbrains/annotations/NotNull;([]) // invisible, parameter 0
+
+    <T::Lfoo/Simple;>(TT;TT;)V
+    public final void setZ(foo.Simple $this$z, foo.Simple value)
+      @Lfoo/TypeParameterAnn;([]) : METHOD_TYPE_PARAMETER 0, null
+      @Lfoo/TypeAnn;([name="Simple"]) : METHOD_TYPE_PARAMETER_BOUND 0, 1, null
+        @Lorg/jetbrains/annotations/NotNull;([]) // invisible, parameter 0
+        @Lorg/jetbrains/annotations/Nullable;([]) // invisible, parameter 1
+}
+
+public abstract interface foo/Simple : java/lang/Object {
+
+}
+
+public abstract interface foo/TypeAnn : java/lang/Object, java/lang/annotation/Annotation {
+    public abstract java.lang.String name()
+}
+
+public abstract interface foo/TypeParameterAnn : java/lang/Object, java/lang/annotation/Annotation {
+
+}

compiler/testData/codegen/asmLike/typeAnnotations/typeParameter.kt

@@ -0,0 +1,17 @@
+// IGNORE_BACKEND: JVM
+// RENDER_ANNOTATIONS
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+package foo
+
+@Target(AnnotationTarget.TYPE_PARAMETER)
+annotation class TypeParameterAnn(val name: String)
+
+class Kotlin {
+
+    fun <@TypeParameterAnn("T") T> bar(p: T): T {
+        return p
+    }
+
+}
+

compiler/testData/codegen/asmLike/typeAnnotations/typeParameter.txt

@@ -0,0 +1,11 @@
+public final class foo/Kotlin : java/lang/Object {
+    public void <init>()
+
+    <T:Ljava/lang/Object;>(TT;)TT;
+    public final java.lang.Object bar(java.lang.Object p)
+      @Lfoo/TypeParameterAnn;([name="T"]) : METHOD_TYPE_PARAMETER 0, null
+}
+
+public abstract interface foo/TypeParameterAnn : java/lang/Object, java/lang/annotation/Annotation {
+    public abstract java.lang.String name()
+}

compiler/testData/codegen/asmLike/typeAnnotations/typeParameter16.kt

@@ -0,0 +1,15 @@
+// RENDER_ANNOTATIONS
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.6
+package foo
+
+@Target(AnnotationTarget.TYPE_PARAMETER)
+annotation class TypeParameterAnn(val name: String)
+
+class Kotlin {
+
+    fun <@TypeParameterAnn("T") T> bar(p: T): T {
+        return p
+    }
+
+}

compiler/testData/codegen/asmLike/typeAnnotations/typeParameter16.txt

@@ -0,0 +1,10 @@
+public final class foo/Kotlin : java/lang/Object {
+    public void <init>()
+
+    <T:Ljava/lang/Object;>(TT;)TT;
+    public final java.lang.Object bar(java.lang.Object p)
+}
+
+public abstract interface foo/TypeParameterAnn : java/lang/Object, java/lang/annotation/Annotation {
+    public abstract java.lang.String name()
+}

compiler/testData/codegen/box/annotations/typeAnnotations/functionTypeParameterBound.kt

@@ -0,0 +1,46 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+// EMIT_JVM_TYPE_ANNOTATIONS
+// JVM_TARGET: 1.8
+// WITH_REFLECT
+// FULL_JDK
+package foo
+
+import kotlin.reflect.KClass
+import kotlin.reflect.full.functions
+
+@Target(AnnotationTarget.TYPE)
+annotation class TypeAnn(val name: String)
+
+interface SimpleInterface
+open class SimpleClass
+
+class Kotlin {
+
+    fun <T> interfaceClassBound() where T : @TypeAnn("Interface") SimpleInterface, T : @TypeAnn("Class") SimpleClass {
+
+    }
+
+    fun <T> classInterfaceBound() where T : @TypeAnn("Class") SimpleClass, T : @TypeAnn("Interface") SimpleInterface  {
+
+    }
+}
+
+fun box() : String {
+    val interfaceBounds = Kotlin::class.functions.single { it.name == "interfaceClassBound" }.typeParameters.single()
+    if (interfaceBounds.upperBounds[0].annotations.joinToString() != "@foo.TypeAnn(name=Interface)") return "fail 1: ${interfaceBounds.upperBounds[0].annotations.joinToString()}"
+    if ((interfaceBounds.upperBounds[0].classifier as KClass<*>).simpleName != "SimpleInterface") return "fail 1.1: ${interfaceBounds.upperBounds[0].classifier}"
+
+    if (interfaceBounds.upperBounds[1].annotations.joinToString() != "@foo.TypeAnn(name=Class)") return "fail 2: ${interfaceBounds.upperBounds[1].annotations.joinToString()}"
+    if ((interfaceBounds.upperBounds[1].classifier as KClass<*>).simpleName != "SimpleClass") return "fail 2.1: ${interfaceBounds.upperBounds[1].classifier}"
+
+    val classBounds = Kotlin::class.functions.single { it.name == "classInterfaceBound" }.typeParameters.single()
+    if (classBounds.upperBounds[0].annotations.joinToString() != "@foo.TypeAnn(name=Class)") return "fail 3: ${classBounds.upperBounds[0].annotations.joinToString()}"
+    if ((classBounds.upperBounds[0].classifier as KClass<*>).simpleName != "SimpleClass") return "fail 3.1: ${classBounds.upperBounds[0].classifier}"
+
+    if (classBounds.upperBounds[1].annotations.joinToString() != "@foo.TypeAnn(name=Interface)") return "fail 4: ${classBounds.upperBounds[1].annotations.joinToString()}"
+    if ((classBounds.upperBounds[1].classifier as KClass<*>).simpleName != "SimpleInterface") return "fail 4.1: ${classBounds.upperBounds[1].classifier}"
+
+    return "OK"
+}
+

compiler/testData/codegen/box/annotations/typeAnnotations/methodTypeParameters.kt

@@ -0,0 +1,183 @@
+// IGNORE_BACKEND: JVM
+// IGNORE_LIGHT_ANALYSIS
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+// EMIT_JVM_TYPE_ANNOTATIONS
+// JVM_TARGET: 1.8
+// WITH_REFLECT
+// FULL_JDK
+package foo
+
+import java.lang.reflect.AnnotatedType
+import java.lang.reflect.TypeVariable
+import java.lang.reflect.AnnotatedParameterizedType
+import kotlin.reflect.jvm.javaMethod
+import kotlin.test.fail
+
+@Target(AnnotationTarget.TYPE)
+annotation class TypeAnn(val name: String)
+
+@Target(AnnotationTarget.TYPE_PARAMETER)
+annotation class TypeParameterAnn
+
+@Target(AnnotationTarget.TYPE_PARAMETER)
+@Retention(AnnotationRetention.BINARY)
+annotation class TypeParameterAnnBinary
+
+interface Simple
+class SimpleClass
+interface Generic<G>
+class GenericClass<G>
+
+class Kotlin {
+
+    fun <@TypeParameterAnn @TypeParameterAnnBinary T> foo(s: T) : T {
+        return s;
+    }
+
+    fun <@TypeParameterAnn T : @TypeAnn("Simple") Simple> interfaceBound(s: T) : T {
+        return s;
+    }
+
+    fun <@TypeParameterAnn T : @TypeAnn("Simple") SimpleClass> classBound(s: T) : T {
+        return s;
+    }
+
+    fun <T : @TypeAnn("Generic") Generic<@TypeAnn("Simple") Simple>> interfaceBoundGeneric(s: T) : T {
+        return s;
+    }
+
+    fun <T : @TypeAnn("GenericClass") GenericClass<@TypeAnn("SimpleClass") SimpleClass>> classBoundGeneric(s: T) : T {
+        return s;
+    }
+
+    fun <Y, @TypeParameterAnn T : @TypeAnn("Y as Bound") Y> typeParameterTypeParameterBound(s: T) : T {
+        return s;
+    }
+}
+
+fun box(): String {
+
+    //foo
+    checkTypeParameterAnnotation(
+        Kotlin::class.java.methods.single{it.name == "foo"}.typeParameters.single(),
+        "T",
+        "@foo.TypeParameterAnn()",
+        "foo"
+    )
+
+    //interfaceBound
+    val interfaceBound = Kotlin::class.java.methods.single { it.name == "interfaceBound" }
+    checkTypeParameterAnnotation(
+        interfaceBound.typeParameters.single(),
+        "T",
+        "@foo.TypeParameterAnn()",
+        "interfaceBound type parameter"
+    )
+
+    checkTypeAnnotation(
+        interfaceBound.typeParameters.single().annotatedBounds.single(),
+        "interface foo.Simple",
+        "@foo.TypeAnn(name=Simple)",
+        "interfaceBound bound"
+    )
+
+    //classBound
+    val classBound = Kotlin::class.java.methods.single { it.name == "classBound" }
+    checkTypeParameterAnnotation(
+        classBound.typeParameters.single(),
+        "T",
+        "@foo.TypeParameterAnn()",
+        "classBound type parameter"
+    )
+
+    checkTypeAnnotation(
+        classBound.typeParameters.single().annotatedBounds.single(),
+        "class foo.SimpleClass",
+        "@foo.TypeAnn(name=Simple)",
+        "classBound bound"
+    )
+
+
+    //interfaceBoundGeneric
+    val interfaceBoundGeneric = Kotlin::class.java.methods.single { it.name == "interfaceBoundGeneric" }
+    checkTypeAnnotation(
+        interfaceBoundGeneric.typeParameters.single().annotatedBounds.single(),
+        "foo.Generic<foo.Simple>",
+        "@foo.TypeAnn(name=Generic)",
+        "interfaceBoundGeneric bound"
+    )
+
+    checkTypeAnnotation(
+        (interfaceBoundGeneric.typeParameters.single().annotatedBounds.single() as AnnotatedParameterizedType).getAnnotatedActualTypeArguments().single(),
+        "interface foo.Simple",
+        "@foo.TypeAnn(name=Simple)",
+        "interfaceBoundGeneric bound parameter"
+    )
+
+    //classBoundGeneric
+    val classBoundGeneric = Kotlin::class.java.methods.single { it.name == "classBoundGeneric" }
+    // Works on JDK 15
+//    checkTypeAnnotation(
+//        classBoundGeneric.typeParameters.single().annotatedBounds.single(),
+//        "foo.GenericClass<foo.SimpleClass>",
+//        "@foo.TypeAnn(name=GenericClass)",
+//        "classBoundGeneric bound"
+//    )
+
+    checkTypeAnnotation(
+        (classBoundGeneric.typeParameters.single().annotatedBounds.single() as AnnotatedParameterizedType).getAnnotatedActualTypeArguments().single(),
+        "class foo.SimpleClass",
+        "@foo.TypeAnn(name=SimpleClass)",
+        "classBoundGeneric bound parameter"
+    )
+
+    //typeParameterTypeParameterBound
+    val typeParameterTypeParameterBound = Kotlin::class.java.methods.single { it.name == "typeParameterTypeParameterBound" }
+    checkTypeParameterAnnotation(
+        typeParameterTypeParameterBound.typeParameters[1]!!,
+        "T",
+        "@foo.TypeParameterAnn()",
+        "typeParameterTypeParameterBound type parameter"
+    )
+    // Works on JDK 15
+//    checkTypeAnnotation(
+//        typeParameterTypeParameterBound.typeParameters[1]!!.annotatedBounds.single(),
+//        "Y",
+//        "@foo.TypeAnn(name=Y as Bound)",
+//        "typeParameterTypeParameterBound bound"
+//    )
+
+    return "OK"
+}
+
+fun checkTypeParameterAnnotation(
+    typeParameter: TypeVariable<*>,
+    type: String,
+    annotations: String,
+    message: String
+) {
+    if (typeParameter.annotation() != annotations) fail("check $message (1): ${typeParameter.annotation()} != $annotations")
+
+    if (typeParameter.toString() != type) fail("check $message (2): ${typeParameter.toString()} != $type")
+}
+
+
+fun checkTypeAnnotation(
+    annotatedType: AnnotatedType,
+    type: String,
+    annotations: String,
+    message: String
+) {
+    if (annotatedType.annotation() != annotations &&
+        //JDK11+
+        annotatedType . annotation () != annotations.replace("=", "=\"").replace(")", "\")")
+    ) fail("check $message (1): ${annotatedType.annotation()} != $annotations")
+
+    if (annotatedType.type.toString() != type) fail("check $message (2): ${annotatedType.type} != $type")
+}
+
+
+fun AnnotatedType.annotation() = annotations.joinToString()
+
+fun TypeVariable<*>.annotation() = annotations.joinToString()