If CSS has a class name selector (e.g. Button) which is not qualified by a namespace, the compiler warning is on the wrong line

SDK revision 5789

Steps to reproduce:
1. Compile this program:

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768">

<fx:Style>
Button

</fx:Style>

<s:Button id="mybutton" label="hi" />
</s:Application>

Actual Results:
Error messages:

– begin –
/Users/mmoreart/Documents/runtime-gumbo.mac.product/f1/src/f1.mxml(2): Warning: The CSS type selector 'Button' was not processed, because the type was not used in the application.

xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768">
– end –

Expected Results:
Should be line 4, not line 2.