Simplify KProperty implementations: get rid of KMutablePropertyImpl

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty0Impl.kt

@@ -38,7 +38,7 @@ internal open class KProperty0Impl<out R> : DescriptorBasedProperty<R>, KPropert
     }
 }
 
-internal open class KMutableProperty0Impl<R> : KProperty0Impl<R>, KMutableProperty0<R>, KMutablePropertyImpl<R> {
+internal class KMutableProperty0Impl<R> : KProperty0Impl<R>, KMutableProperty0<R> {
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
 
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
@@ -49,7 +49,7 @@ internal open class KMutableProperty0Impl<R> : KProperty0Impl<R>, KMutableProper
 
     override fun set(value: R) = setter.call(value)
 
-    class Setter<R>(override val property: KMutableProperty0Impl<R>) : KMutablePropertyImpl.Setter<R>(), KMutableProperty0.Setter<R> {
+    class Setter<R>(override val property: KMutableProperty0Impl<R>) : KPropertyImpl.Setter<R>(), KMutableProperty0.Setter<R> {
         override fun invoke(value: R): Unit = property.set(value)
     }
 }

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty1Impl.kt

@@ -38,7 +38,7 @@ internal open class KProperty1Impl<T, out R> : DescriptorBasedProperty<R>, KProp
     }
 }
 
-internal open class KMutableProperty1Impl<T, R> : KProperty1Impl<T, R>, KMutableProperty1<T, R>, KMutablePropertyImpl<R> {
+internal class KMutableProperty1Impl<T, R> : KProperty1Impl<T, R>, KMutableProperty1<T, R> {
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
 
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
@@ -49,7 +49,7 @@ internal open class KMutableProperty1Impl<T, R> : KProperty1Impl<T, R>, KMutable
 
     override fun set(receiver: T, value: R) = setter.call(receiver, value)
 
-    class Setter<T, R>(override val property: KMutableProperty1Impl<T, R>) : KMutablePropertyImpl.Setter<R>(), KMutableProperty1.Setter<T, R> {
+    class Setter<T, R>(override val property: KMutableProperty1Impl<T, R>) : KPropertyImpl.Setter<R>(), KMutableProperty1.Setter<T, R> {
         override fun invoke(receiver: T, value: R): Unit = property.set(receiver, value)
     }
 }

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty2Impl.kt

@@ -38,7 +38,7 @@ internal open class KProperty2Impl<D, E, out R> : DescriptorBasedProperty<R>, KP
     }
 }
 
-internal open class KMutableProperty2Impl<D, E, R> : KProperty2Impl<D, E, R>, KMutableProperty2<D, E, R>, KMutablePropertyImpl<R> {
+internal class KMutableProperty2Impl<D, E, R> : KProperty2Impl<D, E, R>, KMutableProperty2<D, E, R> {
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
 
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
@@ -49,7 +49,7 @@ internal open class KMutableProperty2Impl<D, E, R> : KProperty2Impl<D, E, R>, KM
 
     override fun set(receiver1: D, receiver2: E, value: R) = setter.call(receiver1, receiver2, value)
 
-    class Setter<D, E, R>(override val property: KMutableProperty2Impl<D, E, R>) : KMutablePropertyImpl.Setter<R>(), KMutableProperty2.Setter<D, E, R> {
+    class Setter<D, E, R>(override val property: KMutableProperty2Impl<D, E, R>) : KPropertyImpl.Setter<R>(), KMutableProperty2.Setter<D, E, R> {
         override fun invoke(receiver1: D, receiver2: E, value: R): Unit = property.set(receiver1, receiver2, value)
     }
 }

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt

@@ -94,15 +94,8 @@ internal interface KPropertyImpl<out R> : KProperty<R>, KCallableImpl<R> {
 
         override val defaultCaller: FunctionCaller<*>? get() = null
     }
-}
-
-
-internal interface KMutablePropertyImpl<R> : KMutableProperty<R>, KPropertyImpl<R> {
-    override val setter: Setter<R>
-
-    abstract class Setter<R> : KPropertyImpl.Accessor<R>(), KMutableProperty.Setter<R>, KCallableImpl<Unit> {
-        abstract override val property: KMutablePropertyImpl<R>
 
+    abstract class Setter<R> : Accessor<R>(), KMutableProperty.Setter<R>, KCallableImpl<Unit> {
         override val name: String get() = "<set-${property.name}>"
 
         override val container: KDeclarationContainerImpl get() = property.container