Do not remove import to component functions

idea/src/org/jetbrains/jet/plugin/editor/importOptimizer/JetImportOptimizer.java

@@ -23,6 +23,7 @@ import com.intellij.psi.*;
 import com.intellij.psi.util.PsiTreeUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.jet.lang.descriptors.CallableDescriptor;
 import org.jetbrains.jet.lang.descriptors.FunctionDescriptor;
 import org.jetbrains.jet.lang.psi.*;
 import org.jetbrains.jet.lang.resolve.BindingContext;
@@ -193,15 +194,32 @@ public class JetImportOptimizer implements ImportOptimizer {
                 ResolveSession resolveSession = WholeProjectAnalyzerFacade.getLazyResolveSessionForFile((JetFile) expression.getContainingFile());
                 BindingContext context = ResolveSessionUtils.resolveToExpression(resolveSession, expression);
                 ResolvedCall<FunctionDescriptor> resolvedCall = context.get(BindingContext.LOOP_RANGE_ITERATOR_RESOLVED_CALL, expression.getLoopRange());
-                if (resolvedCall != null) {
-                    FunctionDescriptor iteratorDescriptor = resolvedCall.getResultingDescriptor();
-                    FqNameUnsafe name = DescriptorUtils.getFQName(iteratorDescriptor);
-                    assert name.isSafe();
-                    usedQualifiedNames.add(name.toSafe());
-                }
+                addResolvedCallFqName(resolvedCall);
 
                 super.visitForExpression(expression);
             }
+
+            @Override
+            public void visitMultiDeclaration(JetMultiDeclaration declaration) {
+                ResolveSession resolveSession = WholeProjectAnalyzerFacade.getLazyResolveSessionForFile((JetFile) declaration.getContainingFile());
+                BindingContext context = ResolveSessionUtils.resolveToExpression(resolveSession, declaration);
+                List<JetMultiDeclarationEntry> entries = declaration.getEntries();
+                for (JetMultiDeclarationEntry entry : entries) {
+                    ResolvedCall<FunctionDescriptor> resolvedCall = context.get(BindingContext.COMPONENT_RESOLVED_CALL, entry);
+                    addResolvedCallFqName(resolvedCall);
+                }
+
+                super.visitMultiDeclaration(declaration);
+            }
+
+            private void addResolvedCallFqName(@Nullable ResolvedCall resolvedCall) {
+                if (resolvedCall != null) {
+                    CallableDescriptor resultingDescriptor = resolvedCall.getResultingDescriptor();
+                    FqNameUnsafe name = DescriptorUtils.getFQName(resultingDescriptor);
+                    assert name.isSafe(): "FqName for resulting descriptor should be safe " + resultingDescriptor.getName();
+                    usedQualifiedNames.add(name.toSafe());
+                }
+            }
         });
 
         return usedQualifiedNames;

idea/testData/editor/optimizeImports/multifile/ComponentFunction/ComponentFunction_after.kt

@@ -0,0 +1,7 @@
+import test1.MyClass
+import test1.component1
+import test1.component2
+
+fun foo() {
+    val (a, b) = MyClass()
+}

idea/testData/editor/optimizeImports/multifile/ComponentFunction/main.kt

@@ -0,0 +1,7 @@
+import test1.MyClass
+import test1.component1
+import test1.component2
+
+fun foo() {
+    val (a, b) = MyClass()
+}

idea/testData/editor/optimizeImports/multifile/ComponentFunction/myClass.kt

@@ -0,0 +1,7 @@
+package test1
+
+public class MyClass {
+}
+
+public fun MyClass.component1() = 1
+public fun MyClass.component2() = 2

idea/tests/org/jetbrains/jet/plugin/importOptimizer/OptimizeImportsMultiFileTest.java

@@ -46,6 +46,10 @@ public class OptimizeImportsMultiFileTest extends CodeInsightTestCase {
         doTest(getTestName(false) + "/main.kt", getTestName(false) + "/myClass.kt");
     }
 
+    public void testComponentFunction() throws Exception {
+        doTest(getTestName(false) + "/main.kt", getTestName(false) + "/myClass.kt");
+    }
+
     public void doTest(String... fileNames) throws Exception {
         configureByFiles(null, fileNames);
         invokeFormatFile();