raise unchecked warning when captured wildcard is assigned (IDEA-167393)

java/java-psi-api/src/com/intellij/codeInsight/daemon/impl/analysis/JavaGenericsUtil.java

@@ -202,6 +202,10 @@ public class JavaGenericsUtil {
       return false;
     }
 
+    if (rType instanceof PsiCapturedWildcardType) {
+      return isRawToGeneric(lType, ((PsiCapturedWildcardType)rType).getUpperBound());
+    }
+
     if (!(lType instanceof PsiClassType) || !(rType instanceof PsiClassType)) return false;
 
     PsiClassType.ClassResolveResult lResolveResult = ((PsiClassType)lType).resolveGenerics();

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/UncheckedWarningWhenCastingFromCapturedWildcard.java

@@ -0,0 +1,6 @@
+class X {
+  void f(Class<? extends Class> aClass) throws ClassNotFoundException {
+    Class<String> classOfString = <warning descr="Unchecked assignment: 'capture<? extends java.lang.Class>' to 'java.lang.Class<java.lang.String>'">aClass.cast(Long.class)</warning>;
+    System.out.println(classOfString);
+  }
+}

java/java-tests/testSrc/com/intellij/codeInsight/daemon/GenericsHighlightingTest.java

@@ -626,4 +626,8 @@ public class GenericsHighlightingTest extends LightDaemonAnalyzerTestCase {
   public void testAvoidDblSubstitutionDuringErasureOfParameterTypesOfMethodSignature() throws Exception {
     doTest(LanguageLevel.JDK_1_7, JavaSdkVersion.JDK_1_8, false);
   }
+
+  public void testUncheckedWarningWhenCastingFromCapturedWildcard() throws Exception {
+    doTest(LanguageLevel.JDK_1_7, JavaSdkVersion.JDK_1_8, true);
+  }
 }