diff --git a/java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightVisitorImpl.java b/java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightVisitorImpl.java
index e390d435707c..2186e43d17f1 100644
--- a/java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightVisitorImpl.java
+++ b/java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightVisitorImpl.java
@@ -1234,11 +1234,19 @@ public class HighlightVisitorImpl extends JavaElementVisitor implements Highligh
     }
     if (!myHolder.hasErrorResults()) {
       final PsiType functionalInterfaceType = expression.getFunctionalInterfaceType();
-      if (functionalInterfaceType != null && LambdaUtil.dependsOnTypeParams(functionalInterfaceType, functionalInterfaceType, expression)) {
-        HighlightInfo result1 =
-          HighlightInfo.newHighlightInfo(HighlightInfoType.ERROR).range(expression).descriptionAndTooltip("Cyclic inference").create();
-        myHolder.add(result1); //todo[ann] append not inferred type params info
-      } else {
+      if (functionalInterfaceType != null) {
+        final boolean notFunctional = !LambdaUtil.isFunctionalType(functionalInterfaceType);
+        if (notFunctional) {
+          myHolder.add(HighlightInfo.newHighlightInfo(HighlightInfoType.ERROR).range(expression)
+                         .descriptionAndTooltip(functionalInterfaceType.getPresentableText() + " is not a functional interface").create());
+        }
+        else if (LambdaUtil.dependsOnTypeParams(functionalInterfaceType, functionalInterfaceType, expression)) {
+          HighlightInfo result1 =
+            HighlightInfo.newHighlightInfo(HighlightInfoType.ERROR).range(expression).descriptionAndTooltip("Cyclic inference").create();
+          myHolder.add(result1); //todo[ann] append not inferred type params info
+        }
+      }
+      if (!myHolder.hasErrorResults()) {
         final PsiElement referenceNameElement = expression.getReferenceNameElement();
         if (referenceNameElement instanceof PsiKeyword) {
           if (!PsiMethodReferenceUtil.isValidQualifier(expression)) {
diff --git a/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/methodRef/Assignability.java b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/methodRef/Assignability.java
index a5dbcd07db18..de25cbcb6d90 100644
--- a/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/methodRef/Assignability.java
+++ b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/methodRef/Assignability.java
@@ -38,5 +38,5 @@ class Test2 {
 
     void foo(Integer i) {}
 
-    <error descr="Incompatible types. Found: '<method reference>', required: 'java.lang.Object'">Object o = Test2::foo;</error>
+    Object o = <error descr="Object is not a functional interface">Test2::foo</error>;
 }
\ No newline at end of file
diff --git a/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/methodRef/InvalidFunctionalTypeInReturnStmt.java b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/methodRef/InvalidFunctionalTypeInReturnStmt.java
new file mode 100644
index 000000000000..6beccd20be4e
--- /dev/null
+++ b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/methodRef/InvalidFunctionalTypeInReturnStmt.java
@@ -0,0 +1,8 @@
+class Java8 {
+  public void test() {
+  }
+
+  private int m() {
+    return <error descr="int is not a functional interface">Java8::test</error>;
+  }
+}
\ No newline at end of file
diff --git a/java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/MethodRefHighlightingTest.java b/java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/MethodRefHighlightingTest.java
index b5c69c1358f9..fbf8036e8e35 100644
--- a/java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/MethodRefHighlightingTest.java
+++ b/java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/MethodRefHighlightingTest.java
@@ -102,6 +102,9 @@ public class MethodRefHighlightingTest extends LightDaemonAnalyzerTestCase {
   public void testQualifiersInStaticContext() throws Exception {
     doTest();
   }
+  public void testInvalidFunctionalTypeInReturnStmt() throws Exception {
+    doTest();
+  }
 
   private void doTest() {
     doTest(false);
diff --git a/platform/lang-impl/src/com/intellij/codeInspection/ex/GlobalInspectionContextImpl.java b/platform/lang-impl/src/com/intellij/codeInspection/ex/GlobalInspectionContextImpl.java
index 68ace93bf894..8551542c42ad 100644
--- a/platform/lang-impl/src/com/intellij/codeInspection/ex/GlobalInspectionContextImpl.java
+++ b/platform/lang-impl/src/com/intellij/codeInspection/ex/GlobalInspectionContextImpl.java
@@ -649,7 +649,7 @@ public class GlobalInspectionContextImpl extends GlobalInspectionContextBase imp
           }
         });
 
-        ApplicationManager.getApplication().invokeLater(new Runnable() {
+        Runnable runnable = new Runnable() {
           @Override
           public void run() {
             if (!FileModificationService.getInstance().preparePsiElementsForWrite(results.keySet())) return;
@@ -673,7 +673,12 @@ public class GlobalInspectionContextImpl extends GlobalInspectionContextBase imp
               }
             }, commandName, null);
           }
-        });
+        };
+        if (ApplicationManager.getApplication().isUnitTestMode()) {
+          runnable.run();
+        } else {
+          ApplicationManager.getApplication().invokeLater(runnable);
+        }
       }
 
     });
diff --git a/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/assignment/NestedAssignmentInspection.java b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/assignment/NestedAssignmentInspection.java
index e28f3238282e..d8a2fe116114 100644
--- a/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/assignment/NestedAssignmentInspection.java
+++ b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/assignment/NestedAssignmentInspection.java
@@ -15,10 +15,7 @@
  */
 package com.siyeh.ig.assignment;
 
-import com.intellij.psi.PsiAssignmentExpression;
-import com.intellij.psi.PsiElement;
-import com.intellij.psi.PsiExpressionListStatement;
-import com.intellij.psi.PsiExpressionStatement;
+import com.intellij.psi.*;
 import com.siyeh.InspectionGadgetsBundle;
 import com.siyeh.ig.BaseInspection;
 import com.siyeh.ig.BaseInspectionVisitor;
@@ -57,6 +54,7 @@ public class NestedAssignmentInspection extends BaseInspection {
       }
       final PsiElement grandparent = parent.getParent();
       if (parent instanceof PsiExpressionStatement ||
+          parent instanceof PsiLambdaExpression ||
           grandparent instanceof PsiExpressionListStatement) {
         return;
       }
diff --git a/plugins/InspectionGadgets/testsrc/com/siyeh/ig/assignment/NestedAssignmentInspectionTest.java b/plugins/InspectionGadgets/testsrc/com/siyeh/ig/assignment/NestedAssignmentInspectionTest.java
new file mode 100644
index 000000000000..61474dbebf9c
--- /dev/null
+++ b/plugins/InspectionGadgets/testsrc/com/siyeh/ig/assignment/NestedAssignmentInspectionTest.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.siyeh.ig.assignment;
+
+import com.intellij.codeInspection.InspectionProfileEntry;
+import com.siyeh.ig.LightInspectionTestCase;
+
+public class NestedAssignmentInspectionTest extends LightInspectionTestCase {
+
+  public void testLambda() throws Exception {
+    doTest("class Test {" +
+           " {" +
+           "    int[] array = new int[1];" +
+           "    Runnable r = () -> array[0] = 0;" +
+           " }" +
+           "}");
+  }
+
+  @Override
+  protected InspectionProfileEntry getInspection() {
+    return new NestedAssignmentInspection();
+  }
+}
\ No newline at end of file