Consider callable reference's LHS when resolving RHS

Previous resolution sequence (static scope, nested classes scope, receiver) and
a check against type parameters only made sense when there's a type, not an
expression, on the LHS of a callable reference. Also TransientReceiver is
incorrect in such case because private-to-this visibility check only works for
ExpressionReceiver values

compiler/frontend/src/org/jetbrains/kotlin/resolve/callableReferences/CallableReferencesResolutionUtils.kt

@@ -41,6 +41,7 @@ import org.jetbrains.kotlin.resolve.scopes.BaseLexicalScope
 import org.jetbrains.kotlin.resolve.scopes.LexicalScopeKind
 import org.jetbrains.kotlin.resolve.scopes.MemberScope
 import org.jetbrains.kotlin.resolve.scopes.ScopeUtils
+import org.jetbrains.kotlin.resolve.scopes.receivers.ExpressionReceiver
 import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValue
 import org.jetbrains.kotlin.resolve.scopes.receivers.TransientReceiver
 import org.jetbrains.kotlin.resolve.scopes.utils.memberScopeAsImportingScope
@@ -48,6 +49,7 @@ import org.jetbrains.kotlin.resolve.source.toSourceElement
 import org.jetbrains.kotlin.types.FunctionPlaceholders
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.TypeUtils
+import org.jetbrains.kotlin.types.expressions.DoubleColonLHS
 import org.jetbrains.kotlin.types.expressions.ExpressionTypingUtils
 import org.jetbrains.kotlin.utils.Printer
 
@@ -68,7 +70,7 @@ private fun resolvePossiblyAmbiguousCallableReference(
         callResolver: CallResolver
 ): OverloadResolutionResults<CallableDescriptor> {
     val call = CallMaker.makeCall(reference, receiver, null, reference, emptyList())
-    val temporaryTrace = TemporaryTraceAndCache.create(context, "trace to resolve ::${reference.getReferencedName()} as function", reference)
+    val temporaryTrace = TemporaryTraceAndCache.create(context, "resolve callable reference as function", reference)
     val newContext = if (resolutionMode == ResolveArgumentsMode.SHAPE_FUNCTION_ARGUMENTS)
         context.replaceTraceAndCache(temporaryTrace).replaceExpectedType(TypeUtils.NO_EXPECTED_TYPE)
     else
@@ -84,12 +86,12 @@ private fun OverloadResolutionResults<*>.isSomething(): Boolean = !isNothing
 
 fun resolvePossiblyAmbiguousCallableReference(
         callableReferenceExpression: KtCallableReferenceExpression,
-        lhsType: KotlinType?,
+        lhs: DoubleColonLHS?,
         context: ResolutionContext<*>,
         resolutionMode: ResolveArgumentsMode,
         callResolver: CallResolver
 ): OverloadResolutionResults<CallableDescriptor>? {
-    val reference = callableReferenceExpression.getCallableReference()
+    val reference = callableReferenceExpression.callableReference
 
     fun resolveInScope(traceTitle: String, classifier: ClassifierDescriptor, staticScope: MemberScope): OverloadResolutionResults<CallableDescriptor> {
 
@@ -124,27 +126,36 @@ fun resolvePossiblyAmbiguousCallableReference(
         return results
     }
 
-    if (lhsType == null) {
-        return resolvePossiblyAmbiguousCallableReference(reference, null, context, resolutionMode, callResolver)
+    val lhsType = lhs?.type ?: return resolvePossiblyAmbiguousCallableReference(reference, null, context, resolutionMode, callResolver)
+
+    when (lhs) {
+        is DoubleColonLHS.Type -> {
+            val classifier = lhsType.constructor.declarationDescriptor
+            if (classifier !is ClassDescriptor) {
+                context.trace.report(CALLABLE_REFERENCE_LHS_NOT_A_CLASS.on(callableReferenceExpression))
+                return null
+            }
+
+            val possibleStatic = resolveInScope("resolve unbound callable reference in static scope", classifier, classifier.staticScope)
+            if (possibleStatic.isSomething()) return possibleStatic
+
+            val possibleNested = resolveInScope(
+                    "resolve unbound callable reference in static nested classes scope", classifier,
+                    ScopeUtils.getStaticNestedClassesScope(classifier)
+            )
+            if (possibleNested.isSomething()) return possibleNested
+
+            val possibleWithReceiver = resolveWithReceiver("resolve unbound callable reference with receiver", TransientReceiver(lhsType))
+            if (possibleWithReceiver.isSomething()) return possibleWithReceiver
+        }
+        is DoubleColonLHS.Expression -> {
+            val result = resolveWithReceiver("resolve bound callable reference", ExpressionReceiver.create(
+                    callableReferenceExpression.receiverExpression!!, lhsType, context.trace.bindingContext
+            ))
+            if (result.isSomething()) return result
+        }
     }
 
-    val classifier = lhsType.constructor.declarationDescriptor
-    if (classifier !is ClassDescriptor) {
-        context.trace.report(CALLABLE_REFERENCE_LHS_NOT_A_CLASS.on(callableReferenceExpression))
-        return null
-    }
-
-    val possibleStatic = resolveInScope("trace to resolve ::${reference.getReferencedName()} in static scope", classifier, classifier.staticScope)
-    if (possibleStatic.isSomething()) return possibleStatic
-
-    val possibleNested = resolveInScope("trace to resolve ::${reference.getReferencedName()} in static nested classes scope",
-                                        classifier, ScopeUtils.getStaticNestedClassesScope(classifier))
-    if (possibleNested.isSomething()) return possibleNested
-
-    val possibleWithReceiver = resolveWithReceiver("trace to resolve ::${reference.getReferencedName()} with receiver",
-                                                   TransientReceiver(lhsType))
-    if (possibleWithReceiver.isSomething()) return possibleWithReceiver
-
     return null
 }
 

compiler/frontend/src/org/jetbrains/kotlin/types/expressions/DoubleColonExpressionResolver.kt

@@ -307,9 +307,8 @@ class DoubleColonExpressionResolver(
     ): Pair<DoubleColonLHS?, OverloadResolutionResults<*>?> {
         val lhsResult = expression.receiverExpression?.let { resolveDoubleColonLHS(it, expression, context) }
 
-        val resolutionResults = resolvePossiblyAmbiguousCallableReference(
-                expression, lhsResult?.type, context, resolveArgumentsMode, callResolver
-        )
+        val resolutionResults =
+                resolvePossiblyAmbiguousCallableReference(expression, lhsResult, context, resolveArgumentsMode, callResolver)
 
         return lhsResult to resolutionResults
     }

compiler/testData/diagnostics/tests/callableReference/bound/innerNested.kt

@@ -0,0 +1,9 @@
+class Outer {
+    class Nested
+    inner class Inner
+}
+
+fun test() {
+    Outer()::Inner
+    Outer()::<!UNRESOLVED_REFERENCE!>Nested<!>
+}

compiler/testData/diagnostics/tests/callableReference/bound/innerNested.txt

@@ -0,0 +1,24 @@
+package
+
+public fun test(): kotlin.Unit
+
+public final class Outer {
+    public constructor Outer()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public final inner class Inner {
+        public constructor Inner()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class Nested {
+        public constructor Nested()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/callableReference/bound/privateToThis.kt

@@ -0,0 +1,24 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+class Foo<out T>(name: T) {
+    private var prop: T = name
+        private set
+
+    fun testProp() {
+        val ok1 = this::prop
+        val ok2 = this@Foo::prop
+        val ok3 = object { val y: Any = this@Foo::prop }
+
+        val fail1 = Foo(prop)::<!INVISIBLE_MEMBER!>prop<!>
+    }
+
+    fun testFunc() {
+        val ok1 = this::func
+        val ok2 = this@Foo::func
+        val ok3 = object { val y: Any = this@Foo::func }
+
+        val fail1 = Foo(prop)::<!INVISIBLE_MEMBER!>func<!>
+    }
+
+    private fun func(t: T): T = t
+}

compiler/testData/diagnostics/tests/callableReference/bound/privateToThis.txt

@@ -0,0 +1,12 @@
+package
+
+public final class Foo</*0*/ out T> {
+    public constructor Foo</*0*/ out T>(/*0*/ name: T)
+    private/*private to this*/ final var prop: T
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    private/*private to this*/ final fun func(/*0*/ t: T): T
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final fun testFunc(): kotlin.Unit
+    public final fun testProp(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/callableReference/bound/referenceToStaticMethodOnInstance.kt

@@ -0,0 +1,14 @@
+// FILE: A.java
+
+public class A {
+    public static void test() {}
+}
+
+// FILE: test.kt
+
+enum class E { EN }
+
+fun test() {
+    A()::<!UNRESOLVED_REFERENCE!>test<!>
+    E.EN::<!UNRESOLVED_REFERENCE!>valueOf<!>
+}

compiler/testData/diagnostics/tests/callableReference/bound/referenceToStaticMethodOnInstance.txt

@@ -0,0 +1,32 @@
+package
+
+public fun test(): kotlin.Unit
+
+public open class A {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    public open fun test(): kotlin.Unit
+}
+
+public final enum class E : kotlin.Enum<E> {
+    enum entry EN
+
+    private constructor E()
+    public final override /*1*/ /*fake_override*/ val name: kotlin.String
+    public final override /*1*/ /*fake_override*/ val ordinal: kotlin.Int
+    protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+    public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: E): kotlin.Int
+    public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    protected/*protected and package*/ final override /*1*/ /*fake_override*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun finalize(): kotlin.Unit
+    public final override /*1*/ /*fake_override*/ /*isHiddenForResolutionEverywhereBesideSupercalls*/ fun getDeclaringClass(): java.lang.Class<E!>!
+    public final override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): E
+    public final /*synthesized*/ fun values(): kotlin.Array<E>
+}

compiler/testData/diagnostics/tests/callableReference/bound/valueOfTypeParameterType.kt

@@ -0,0 +1,3 @@
+fun <T: Any> get(t: T): () -> String {
+    return t::toString
+}

compiler/testData/diagnostics/tests/callableReference/bound/valueOfTypeParameterType.txt

@@ -0,0 +1,3 @@
+package
+
+public fun </*0*/ T : kotlin.Any> get(/*0*/ t: T): () -> kotlin.String

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -1751,11 +1751,35 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                     doTest(fileName);
                 }
 
+                @TestMetadata("innerNested.kt")
+                public void testInnerNested() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/callableReference/bound/innerNested.kt");
+                    doTest(fileName);
+                }
+
                 @TestMetadata("object.kt")
                 public void testObject() throws Exception {
                     String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/callableReference/bound/object.kt");
                     doTest(fileName);
                 }
+
+                @TestMetadata("privateToThis.kt")
+                public void testPrivateToThis() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/callableReference/bound/privateToThis.kt");
+                    doTest(fileName);
+                }
+
+                @TestMetadata("referenceToStaticMethodOnInstance.kt")
+                public void testReferenceToStaticMethodOnInstance() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/callableReference/bound/referenceToStaticMethodOnInstance.kt");
+                    doTest(fileName);
+                }
+
+                @TestMetadata("valueOfTypeParameterType.kt")
+                public void testValueOfTypeParameterType() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/callableReference/bound/valueOfTypeParameterType.kt");
+                    doTest(fileName);
+                }
             }
 
             @TestMetadata("compiler/testData/diagnostics/tests/callableReference/function")