No callable reference to generic callables

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/smart/Utils.kt

@@ -238,9 +238,9 @@ private fun MutableCollection<LookupElement>.addLookupElementsForNullable(factor
 }
 
 fun CallableDescriptor.callableReferenceType(resolutionFacade: ResolutionFacade): FuzzyType? {
+    if (!CallType.CALLABLE_REFERENCE.descriptorKindFilter.accepts(this)) return null // not supported by callable references
     val type = getReflectionTypeForCandidateDescriptor(this, resolutionFacade.getFrontendService(ReflectionTypes::class.java)) ?: return null
-    //TODO: no generic
-    return FuzzyType(type, emptyList()/* references to generic functions not supported yet */)
+    return FuzzyType(type, emptyList())
 }
 
 fun LookupElementFactory.createLookupElementsInSmartCompletion(

idea/idea-completion/testData/basic/common/callableReference/EmptyQualifier.kt

@@ -9,6 +9,9 @@ var globalVar = 1
 
 fun funWithFunctionParameter(p: () -> Unit) {}
 
+// callable references to generic functions are not supported currently
+fun <T> genericFun(t: T): T = t
+
 class C {
     fun memberFun(){}
 
@@ -51,3 +54,4 @@ abstract class AbstractClass
 // ABSENT: class
 // ABSENT: class.java
 // EXIST: { itemText: "funWithFunctionParameter", tailText: "(p: () -> Unit) (<root>)", attributes: "" }
+// ABSENT: genericFun

idea/idea-completion/testData/smart/callableReference/NoQualifier2.kt

@@ -7,4 +7,8 @@ fun bar() {
 fun f(){}
 fun f(i: Int){}
 
+// currently not supported for generic funcitons
+fun<T> genericF(t: T){}
+
 // EXIST: ::f
+// ABSENT: ::genericF