--- a/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/java/ElementUtils.java	Wed Dec 31 17:35:10 2014 +0000
+++ b/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/java/ElementUtils.java	Fri Jan 02 14:31:51 2015 +0100
@@ -988,9 +988,7 @@
         }
 
         // search for any super types
-        TypeElement exceptionTypeElement = fromTypeMirror(exceptionType);
-        List<TypeElement> superTypes = getSuperTypes(exceptionTypeElement);
-        for (TypeElement typeElement : superTypes) {
+        for (TypeElement typeElement : getSuperTypes(fromTypeMirror(exceptionType))) {
             if (ElementUtils.containsType(thrownTypes, typeElement.asType())) {
                 return true;
             }
@@ -1022,11 +1020,7 @@
 
     private static boolean isRuntimeException(TypeMirror type) {
         Set<String> typeSuperSet = new HashSet<>(getQualifiedSuperTypeNames(fromTypeMirror(type)));
-        String typeName = getQualifiedName(type);
-        if (!typeSuperSet.contains(Throwable.class.getCanonicalName()) && !typeName.equals(Throwable.class.getCanonicalName())) {
-            throw new IllegalArgumentException("Given type does not extend Throwable.");
-        }
-        return typeSuperSet.contains(RuntimeException.class.getCanonicalName()) || typeName.equals(RuntimeException.class.getCanonicalName());
+        return typeSuperSet.contains(RuntimeException.class.getCanonicalName()) || getQualifiedName(type).equals(RuntimeException.class.getCanonicalName());
     }
 
     private static boolean containsType(Collection<? extends TypeMirror> collection, TypeMirror type) {