Report unmet trait requirements

#KT-3006 Fixed

core/descriptors/src/org/jetbrains/jet/lang/resolve/DescriptorUtils.java

@@ -226,7 +226,7 @@ public class DescriptorUtils {
         return false;
     }
 
-    public static boolean isEnumClass(@NotNull DeclarationDescriptor descriptor) {
+    public static boolean isEnumClass(@Nullable DeclarationDescriptor descriptor) {
         return isKindOf(descriptor, ClassKind.ENUM_CLASS);
     }
 

core/descriptors/src/org/jetbrains/jet/lang/types/lang/KotlinBuiltIns.java

@@ -822,6 +822,10 @@ public class KotlinBuiltIns {
         return fqNames.any.equals(fqName) || fqNames.nothing.equals(fqName);
     }
 
+    public boolean isAny(@NotNull ClassDescriptor descriptor) {
+        return fqNames.any.equals(DescriptorUtils.getFqName(descriptor));
+    }
+
     public boolean isNothing(@NotNull JetType type) {
         return isNothingOrNullableNothing(type)
                && !type.isNullable();