debuggin types in records

I ran across the rather self-explanatory error

   operator domain: XEventTypes.key_xevtinfo
   operand:         {child:word, event:word, event_pt:Geometry.point,
                     keycode:int, mbut_state:XProtTypes.mbutton_state,
                     mod_state:XProtTypes.modkey_state, root:word,
                     root_pt:Geometry.point, same_screen:bool,
                     time:Word32.word}

The problem is that I _think_ the error is due to the fact that I've  
got the type of one of the entries wrong.  Naturally I think I've got  
it right, and clearly I am wrong  :-)

Is there some way to turn up some debugging flags so I would know  
which one ?

Any good stratgey for figuring this out ?

Thanks

Brian


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