KT-11765 Analyze code in anonymous initializer of inteface

#KT-11765 Fixed

compiler/frontend/src/org/jetbrains/kotlin/resolve/BodyResolver.java

@@ -525,20 +525,17 @@ public class BodyResolver {
             @NotNull ClassDescriptorWithResolutionScopes classDescriptor
     ) {
         LexicalScope scopeForInitializers = classDescriptor.getScopeForInitializerResolution();
-        if (!classDescriptor.getConstructors().isEmpty()) {
-            KtExpression body = anonymousInitializer.getBody();
-            if (body != null) {
-                PreliminaryDeclarationVisitor.Companion.createForDeclaration(
-                        (KtDeclaration) anonymousInitializer.getParent().getParent(), trace);
-                expressionTypingServices.getTypeInfo(
-                        scopeForInitializers, body, NO_EXPECTED_TYPE, outerDataFlowInfo, trace, /*isStatement = */true
-                );
-            }
-            processModifiersOnInitializer(anonymousInitializer, scopeForInitializers);
+        KtExpression body = anonymousInitializer.getBody();
+        if (body != null) {
+            PreliminaryDeclarationVisitor.Companion.createForDeclaration(
+                    (KtDeclaration) anonymousInitializer.getParent().getParent(), trace);
+            expressionTypingServices.getTypeInfo(
+                    scopeForInitializers, body, NO_EXPECTED_TYPE, outerDataFlowInfo, trace, /*isStatement = */true
+            );
         }
-        else {
+        processModifiersOnInitializer(anonymousInitializer, scopeForInitializers);
+        if (classDescriptor.getConstructors().isEmpty()) {
             trace.report(ANONYMOUS_INITIALIZER_IN_INTERFACE.on(anonymousInitializer));
-            processModifiersOnInitializer(anonymousInitializer, scopeForInitializers);
         }
     }
 

idea/testData/checker/regression/InitializerInInterface.kt

@@ -0,0 +1,6 @@
+interface I {
+    <error>init {
+        val c = 1
+        val g = c
+    }</error>
+}

idea/tests/org/jetbrains/kotlin/checkers/PsiCheckerTestGenerated.java

@@ -526,6 +526,12 @@ public class PsiCheckerTestGenerated extends AbstractPsiCheckerTest {
             doTest(fileName);
         }
 
+        @TestMetadata("InitializerInInterface.kt")
+        public void testInitializerInInterface() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/checker/regression/InitializerInInterface.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("InterfaceDeclarationAsExpression.kt")
         public void testInterfaceDeclarationAsExpression() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/checker/regression/InterfaceDeclarationAsExpression.kt");