--- a/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/TruffleTypes.java	Tue May 26 20:04:07 2015 +0200
+++ b/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/TruffleTypes.java	Tue May 26 20:04:08 2015 +0200
@@ -44,6 +44,8 @@
  */
 public final class TruffleTypes {
 
+    public static final String EXPECT_ERROR_CLASS_NAME = "com.oracle.truffle.api.dsl.test.ExpectError";
+
     private final DeclaredType node;
     private final ArrayType nodeArray;
     private final TypeMirror unexpectedValueException;
@@ -94,7 +96,7 @@
         nodeFactory = getRequired(context, NodeFactory.class);
         nodeFactoryBase = getRequired(context, NodeFactoryBase.class);
         dslMetadata = getRequired(context, DSLMetadata.class);
-        expectError = (TypeElement) getRequired(context, ExpectError.class).asElement();
+        expectError = getOptional(context, EXPECT_ERROR_CLASS_NAME);
         generateNodeFactory = getRequired(context, GenerateNodeFactory.class);
     }
 
@@ -158,6 +160,10 @@
         return (DeclaredType) type;
     }
 
+    private static TypeElement getOptional(ProcessorContext context, String name) {
+        return context.getEnvironment().getElementUtils().getTypeElement(name);
+    }
+
     public TypeMirror getInvalidAssumption() {
         return invalidAssumption;
     }