Moved an utility method

core/descriptors/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.kt

@@ -29,3 +29,6 @@ public fun ClassDescriptor.hasSyntheticClassObject(): Boolean = getKind() in set
 
 public fun DeclarationDescriptor.getImportableDescriptor(): DeclarationDescriptor =
         if (this is ConstructorDescriptor || DescriptorUtils.isClassObject(this)) getContainingDeclaration()!! else this
+
+public val DeclarationDescriptor.isExtension: Boolean
+    get() = this is CallableDescriptor && getReceiverParameter() != null

idea/src/org/jetbrains/jet/plugin/codeInsight/KotlinCopyPasteReferenceProcessor.kt

@@ -62,6 +62,7 @@ import org.jetbrains.jet.plugin.imports.*
 import org.jetbrains.jet.lang.psi.psiUtil.getReceiverExpression
 import org.jetbrains.jet.utils.*
 import org.jetbrains.jet.renderer.DescriptorRenderer
+import org.jetbrains.jet.lang.resolve.descriptorUtil.isExtension
 
 //NOTE: this class is based on CopyPasteReferenceProcessor and JavaCopyPasteReferenceProcessor
 public class KotlinCopyPasteReferenceProcessor() : CopyPastePostProcessor<ReferenceTransferableData>() {

idea/src/org/jetbrains/jet/plugin/imports/ImportsUtils.kt

@@ -28,6 +28,7 @@ import org.jetbrains.jet.lang.psi.psiUtil.getReceiverExpression
 import com.intellij.psi.PsiElement
 import org.jetbrains.jet.lang.types.JetType
 import org.jetbrains.jet.lang.resolve.descriptorUtil.getImportableDescriptor
+import org.jetbrains.jet.lang.resolve.descriptorUtil.isExtension
 
 public val DeclarationDescriptor.importableFqName: FqName?
     get() {
@@ -64,7 +65,3 @@ public fun isInReceiverScope(referenceElement: PsiElement, referencedDescriptor:
     val isExpressionWithReceiver = referenceElement is JetSimpleNameExpression && referenceElement.getReceiverExpression() != null
     return isExpressionWithReceiver && !referencedDescriptor.isExtension
 }
-
-//TODO: move this utility to more appropriate place
-public val DeclarationDescriptor.isExtension: Boolean
-    get() = this is CallableDescriptor && getReceiverParameter() != null