new inference: wildcard parametrization for lambda with formal params: assignability check for complete parametrization only

java/java-psi-impl/src/com/intellij/psi/impl/source/resolve/graphInference/FunctionalInterfaceParameterizationUtil.java

@@ -118,14 +118,10 @@ public class FunctionalInterfaceParameterizationUtil {
         return null;
       }
 
-      if (!TypeConversionUtil.containsWildcards(parameterization)) {
+      if (!TypeConversionUtil.containsWildcards(parameterization) && psiClassType.isAssignableFrom(parameterization)) {
         return parameterization;
       }
 
-      if (!psiClassType.isAssignableFrom(parameterization)) {
-        return null;
-      }
-
       return getNonWildcardParameterization((PsiClassType)psiClassType);
     }
     return null;

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/wildcardParametrization/LambdaFormalParamTypesParametrization.java

@@ -0,0 +1,10 @@
+import java.util.function.Function;
+
+class Test {
+
+  <U, V> void foo(Function<U, ? extends V> m) {}
+
+  {
+    foo((String e) -> e.length());
+  }
+}

java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/FunctionalTypeWildcardParameterizationTest.java

@@ -28,6 +28,10 @@ public class FunctionalTypeWildcardParameterizationTest extends LightDaemonAnaly
     doTest();
   }
 
+  public void testLambdaFormalParamTypesParametrization() throws Exception {
+    doTest();
+  }
+
   private void doTest() {
     IdeaTestUtil.setTestVersion(JavaSdkVersion.JDK_1_8, getModule(), getTestRootDisposable());
     doTestNewInference(BASE_PATH + "/" + getTestName(false) + ".java", false, false);