diff --git a/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/IDEA78402.java b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/IDEA78402.java
new file mode 100644
index 000000000000..ed8d259ab462
--- /dev/null
+++ b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/IDEA78402.java
@@ -0,0 +1,18 @@
+import java.util.Collection;
+import java.util.List;
+
+class Reference<T> {}
+
+class Bug {
+  private static <T> void foo(List<T> x, Reference<String> y) {
+    System.out.println(x);
+  }
+
+  private static <T> void foo(Collection<T> x, Reference<T> y) {
+    System.out.println(x);
+  }
+
+  public static void bazz(List<String> bar) {
+    foo<error descr="Ambiguous method call: both 'Bug.foo(List<String>, Reference<String>)' and 'Bug.foo(Collection<String>, Reference<String>)' match">(bar, null)</error>;
+  }
+}
\ No newline at end of file
diff --git a/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting8/IDEA78402.java b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting8/IDEA78402.java
new file mode 100644
index 000000000000..ed8d259ab462
--- /dev/null
+++ b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting8/IDEA78402.java
@@ -0,0 +1,18 @@
+import java.util.Collection;
+import java.util.List;
+
+class Reference<T> {}
+
+class Bug {
+  private static <T> void foo(List<T> x, Reference<String> y) {
+    System.out.println(x);
+  }
+
+  private static <T> void foo(Collection<T> x, Reference<T> y) {
+    System.out.println(x);
+  }
+
+  public static void bazz(List<String> bar) {
+    foo<error descr="Ambiguous method call: both 'Bug.foo(List<String>, Reference<String>)' and 'Bug.foo(Collection<String>, Reference<String>)' match">(bar, null)</error>;
+  }
+}
\ No newline at end of file
diff --git a/java/java-tests/testSrc/com/intellij/codeInsight/daemon/GenericsHighlightingTest.java b/java/java-tests/testSrc/com/intellij/codeInsight/daemon/GenericsHighlightingTest.java
index f6be0686d239..688e83b5b198 100644
--- a/java/java-tests/testSrc/com/intellij/codeInsight/daemon/GenericsHighlightingTest.java
+++ b/java/java-tests/testSrc/com/intellij/codeInsight/daemon/GenericsHighlightingTest.java
@@ -371,6 +371,7 @@ public class GenericsHighlightingTest extends LightDaemonAnalyzerTestCase {
   public void testIDEA126697() { doTest(LanguageLevel.JDK_1_7, JavaSdkVersion.JDK_1_7, true); }
   public void testIDEA126633() { doTest(LanguageLevel.JDK_1_7, JavaSdkVersion.JDK_1_7, false); }
   public void testIDEA124363() { doTest(LanguageLevel.JDK_1_7, JavaSdkVersion.JDK_1_7, false); }
+  public void testIDEA78402() { doTest(LanguageLevel.JDK_1_7, JavaSdkVersion.JDK_1_7, false); }
   //jdk should propagate LL 1.4 but actually it provides LL 1.7?!
   public void testCastObjectToIntJdk14() { doTest(LanguageLevel.JDK_1_7, JavaSdkVersion.JDK_1_4, false); }
 
diff --git a/java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/GenericsHighlighting8Test.java b/java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/GenericsHighlighting8Test.java
index 8f9167d83a21..d23dfea6daf0 100644
--- a/java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/GenericsHighlighting8Test.java
+++ b/java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/GenericsHighlighting8Test.java
@@ -759,6 +759,8 @@ public class GenericsHighlighting8Test extends LightDaemonAnalyzerTestCase {
     doTest();
   }
 
+  public void testIDEA78402() { doTest(); }
+
   private void doTest() {
     doTest(false);
   }