Support equals, hashCode, toString for ::-references without reflection

core/runtime.jvm/src/kotlin/jvm/internal/ClassReference.kt

@@ -43,4 +43,13 @@ public class ClassReference(override val jClass: Class<*>) : KClass<Any>, ClassB
         get() = error()
 
     private fun error(): Nothing = throw KotlinReflectionNotSupportedError()
+
+    override fun equals(other: Any?) =
+            other is ClassReference && jClass == other.jClass
+
+    override fun hashCode() =
+            jClass.hashCode()
+
+    override fun toString() =
+            jClass.toString() + Reflection.REFLECTION_NOT_AVAILABLE
 }

core/runtime.jvm/src/kotlin/jvm/internal/FunctionReference.java

@@ -79,4 +79,28 @@ public class FunctionReference extends FunctionImpl implements KFunction {
     protected static Error error() {
         throw new KotlinReflectionNotSupportedError();
     }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) return true;
+        if (!(obj instanceof FunctionReference)) return false;
+
+        FunctionReference other = (FunctionReference) obj;
+        return getOwner().equals(other.getOwner()) &&
+               getName().equals(other.getName()) &&
+               getSignature().equals(other.getSignature());
+    }
+
+    @Override
+    public int hashCode() {
+        return (getOwner().hashCode() * 31 + getName().hashCode()) * 31 + getSignature().hashCode();
+    }
+
+    @Override
+    public String toString() {
+        // TODO: consider adding the class name to toString() for constructors
+        return "<init>".equals(getName())
+               ? "constructor" + Reflection.REFLECTION_NOT_AVAILABLE
+               : "function " + getName() + Reflection.REFLECTION_NOT_AVAILABLE;
+    }
 }

core/runtime.jvm/src/kotlin/jvm/internal/PropertyReference.java

@@ -19,4 +19,24 @@ package kotlin.jvm.internal;
 import kotlin.reflect.KProperty;
 
 public abstract class PropertyReference extends CallableReference implements KProperty {
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) return true;
+        if (!(obj instanceof PropertyReference)) return false;
+
+        PropertyReference other = (PropertyReference) obj;
+        return getOwner().equals(other.getOwner()) &&
+               getName().equals(other.getName()) &&
+               getSignature().equals(other.getSignature());
+    }
+
+    @Override
+    public int hashCode() {
+        return (getOwner().hashCode() * 31 + getName().hashCode()) * 31 + getSignature().hashCode();
+    }
+
+    @Override
+    public String toString() {
+        return "property " + getName() + Reflection.REFLECTION_NOT_AVAILABLE;
+    }
 }

core/runtime.jvm/src/kotlin/jvm/internal/Reflection.java

@@ -39,6 +39,8 @@ public class Reflection {
         factory = impl != null ? impl : new ReflectionFactory();
     }
 
+    /* package */ static final String REFLECTION_NOT_AVAILABLE = " (Kotlin reflection is not available)";
+
     private static final KClass[] EMPTY_K_CLASS_ARRAY = new KClass[0];
 
     public static KClass createKotlinClass(Class javaClass) {