Fix let implement quickfix label for object expressions

Fixes #KT-11782

idea/src/org/jetbrains/kotlin/idea/quickfix/LetImplementInterfaceFix.kt

@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.idea.util.ShortenReferences
 import org.jetbrains.kotlin.psi.KtClassOrObject
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi.KtPsiFactory
+import org.jetbrains.kotlin.psi.psiUtil.isObjectLiteral
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.TypeUtils
 import org.jetbrains.kotlin.types.typeUtil.isInterface
@@ -52,7 +53,8 @@ class LetImplementInterfaceFix(
         expectedTypeNameSourceCode = IdeDescriptorRenderers.SOURCE_CODE.renderType(expectedTypeNotNullable)
 
         val verb = if (expressionType.isInterface()) "extend" else "implement"
-        prefix = "Let '${expressionType.renderShort()}' $verb"
+        val typeDescription = if (element.isObjectLiteral()) "the anonymous object" else "'${expressionType.renderShort()}'"
+        prefix = "Let $typeDescription $verb"
 
         validExpectedType = with (expectedType) {
             isInterface() &&
@@ -72,4 +74,4 @@ class LetImplementInterfaceFix(
         val entryElement = element.addSuperTypeListEntry(superTypeEntry)
         ShortenReferences.DEFAULT.process(entryElement)
     }
-}
+}

idea/testData/quickfix/typeMismatch/letObjectImplementAdditionalInterface.kt

@@ -0,0 +1,11 @@
+// "Let the anonymous object implement interface 'A'" "true"
+package let.implement
+
+fun bar() {
+    foo(<caret>object {})
+}
+
+fun foo(a: A) {
+}
+
+interface A

idea/testData/quickfix/typeMismatch/letObjectImplementAdditionalInterface.kt.after

@@ -0,0 +1,11 @@
+// "Let the anonymous object implement interface 'A'" "true"
+package let.implement
+
+fun bar() {
+    foo(<caret>object : A {})
+}
+
+fun foo(a: A) {
+}
+
+interface A

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixTestGenerated.java

@@ -7405,6 +7405,12 @@ public class QuickFixTestGenerated extends AbstractQuickFixTest {
             doTest(fileName);
         }
 
+        @TestMetadata("letObjectImplementAdditionalInterface.kt")
+        public void testLetObjectImplementAdditionalInterface() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/quickfix/typeMismatch/letObjectImplementAdditionalInterface.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("letStringImplementInterface.kt")
         public void testLetStringImplementInterface() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/quickfix/typeMismatch/letStringImplementInterface.kt");