Smart completion works in initializer of variable with unknown type (the same as ordinary completion)

#KT-8691 Fixed

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

@@ -110,12 +110,7 @@ class SmartCompletion(
         val asTypePositionResult = buildForAsTypePosition()
         if (asTypePositionResult != null) return asTypePositionResult
 
-        val expressionWithType = if (receiver != null) {
-            expression.getParent() as? JetExpression ?: return null
-        }
-        else {
-            expression
-        }
+        val expressionWithType = expression.toExpressionWithType()
 
         var originalExpectedInfos = calcExpectedInfos(expressionWithType) ?: return null
         originalExpectedInfos = originalExpectedInfos.filterNot { it.fuzzyType?.type?.isError ?: false }
@@ -207,7 +202,9 @@ class SmartCompletion(
             if (originalDeclaration != null) {
                 val originalDescriptor = originalDeclaration.resolveToDescriptor() as? CallableDescriptor
                 val returnType = originalDescriptor?.getReturnType()
-                return if (returnType != null) listOf(ExpectedInfo(returnType, declaration.getName(), null)) else null
+                if (returnType != null && !returnType.isError) {
+                    return listOf(ExpectedInfo(returnType, declaration.getName(), null))
+                }
             }
         }
 

idea/idea-completion/testData/smart/ImplicitlyTypedValInitializerUnknownType.kt

@@ -0,0 +1,9 @@
+class C
+
+fun foo(p1: String, p2: Int) {
+    val v = <caret>
+}
+
+// EXIST: p1
+// EXIST: p2
+// ABSENT: C

idea/idea-completion/testData/weighers/smart/NoExpectedType.kt

@@ -0,0 +1,13 @@
+interface I {
+    fun takeXxx(): Int = 0
+    fun takeYyy(): Int = 0
+    fun takeZzz(): Int = 0
+}
+
+fun foo(i: I) {
+    val yyy = i.take<caret>
+}
+
+// ORDER: takeYyy
+// ORDER: takeXxx
+// ORDER: takeZzz

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmSmartCompletionTestGenerated.java

@@ -179,6 +179,12 @@ public class JvmSmartCompletionTestGenerated extends AbstractJvmSmartCompletionT
         doTest(fileName);
     }
 
+    @TestMetadata("ImplicitlyTypedValInitializerUnknownType.kt")
+    public void testImplicitlyTypedValInitializerUnknownType() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/smart/ImplicitlyTypedValInitializerUnknownType.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("InClassObject.kt")
     public void testInClassObject() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/smart/InClassObject.kt");

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/weighers/SmartCompletionWeigherTestGenerated.java

@@ -185,6 +185,12 @@ public class SmartCompletionWeigherTestGenerated extends AbstractSmartCompletion
         doTest(fileName);
     }
 
+    @TestMetadata("NoExpectedType.kt")
+    public void testNoExpectedType() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/weighers/smart/NoExpectedType.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("NoNameSimilarityForQualifier.kt")
     public void testNoNameSimilarityForQualifier() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/weighers/smart/NoNameSimilarityForQualifier.kt");