Declare final

src/de.hpi.swa.trufflesqueak/src/de/hpi/swa/trufflesqueak/nodes/plugins/ffi/PrimExternalCallNode.java

@@ -132,7 +132,7 @@ private Object doExternalCall(final MaterializedFrame frame) {
             // (AbstractSendNode.executeVoid). Pop the return value and return it.
             final Object returnValue = FrameAccess.getStackValue(frame, FrameAccess.getStackPointer(frame) - 1, FrameAccess.getNumArguments(frame));
             FrameAccess.setStackPointer(frame, FrameAccess.getStackPointer(frame) - 1);
-            long failReason = interpreterProxy.failed();
+            final long failReason = interpreterProxy.failed();
             if (failReason != 0) {
                 throw PrimitiveFailed.andTransferToInterpreter((int) failReason);
             }