Take imported from object descriptor into account in pseudocode

So #KT-15566 Fixed

compiler/frontend/src/org/jetbrains/kotlin/cfg/pseudocode/PseudocodeUtil.java

@@ -30,6 +30,7 @@ import org.jetbrains.kotlin.psi.KtElement;
 import org.jetbrains.kotlin.psi.KtExpression;
 import org.jetbrains.kotlin.resolve.BindingContext;
 import org.jetbrains.kotlin.resolve.BindingTrace;
+import org.jetbrains.kotlin.resolve.PropertyImportedFromObject;
 import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall;
 import org.jetbrains.kotlin.resolve.calls.resolvedCallUtil.ResolvedCallUtilKt;
 import org.jetbrains.kotlin.types.KotlinType;
@@ -98,7 +99,12 @@ public class PseudocodeUtil {
     ) {
         if (instruction instanceof AccessValueInstruction) {
             KtElement element = ((AccessValueInstruction) instruction).getElement();
-            return element instanceof KtDeclaration ? null : extractVariableDescriptorIfAny(instruction, bindingContext);
+            if (element instanceof KtDeclaration) return null;
+            VariableDescriptor descriptor = extractVariableDescriptorIfAny(instruction, bindingContext);
+            if (descriptor instanceof PropertyImportedFromObject) {
+                return ((PropertyImportedFromObject) descriptor).getCallableFromObject();
+            }
+            return descriptor;
         }
         return null;
     }

compiler/testData/diagnostics/tests/controlFlowAnalysis/fieldAsClassDelegate.kt

@@ -0,0 +1,35 @@
+// See KT-15566
+
+import DefaultHttpClient.client
+
+interface HttpClient
+
+class HttpClientImpl : HttpClient
+
+// Below we should have initialization error for both (!) delegates
+
+object DefaultHttpClient : HttpClient by <!UNINITIALIZED_VARIABLE!>client<!> {
+    val client = HttpClientImpl()
+}
+
+object DefaultHttpClientWithGetter : HttpClient by client {
+    val client get() = HttpClientImpl()
+}
+
+object DefaultHttpClientWithFun : HttpClient by fClient() {
+}
+
+private fun fClient() = HttpClientImpl()
+
+private fun <T> lazy(init: () -> T): kotlin.<!UNRESOLVED_REFERENCE!>Lazy<!><T> {
+    init()
+    null!!
+}
+
+object DefaultHttpClientWithBy : HttpClient by client {
+    val client by lazy { HttpClientImpl() }
+}
+
+object DefaultFqHttpClient : HttpClient by DefaultFqHttpClient.<!UNINITIALIZED_VARIABLE!>client<!> {
+    val client = HttpClientImpl()
+}

compiler/testData/diagnostics/tests/controlFlowAnalysis/fieldAsClassDelegate.txt

@@ -0,0 +1,56 @@
+package
+
+private fun fClient(): HttpClientImpl
+private fun </*0*/ T> lazy(/*0*/ init: () -> T): [ERROR : kotlin.Lazy<T>]<T>
+
+public object DefaultFqHttpClient : HttpClient {
+    private constructor DefaultFqHttpClient()
+    public final val client: HttpClientImpl
+    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 object DefaultHttpClient : HttpClient {
+    private constructor DefaultHttpClient()
+    public final val client: HttpClientImpl
+    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 object DefaultHttpClientWithBy : HttpClient {
+    private constructor DefaultHttpClientWithBy()
+    public final val client: [ERROR : <ERROR FUNCTION RETURN TYPE>]
+    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 object DefaultHttpClientWithFun : HttpClient {
+    private constructor DefaultHttpClientWithFun()
+    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 object DefaultHttpClientWithGetter : HttpClient {
+    private constructor DefaultHttpClientWithGetter()
+    public final val client: HttpClientImpl
+    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 interface HttpClient {
+    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 HttpClientImpl : HttpClient {
+    public constructor HttpClientImpl()
+    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/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -3748,6 +3748,12 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("fieldAsClassDelegate.kt")
+            public void testFieldAsClassDelegate() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/controlFlowAnalysis/fieldAsClassDelegate.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("infiniteLoops.kt")
             public void testInfiniteLoops() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/controlFlowAnalysis/infiniteLoops.kt");