Hi,

I was trying to wrap my head around the Y combinator in trunk, update 
10568. Of course I got it wrong, and the debugger opened up. Notice in 
the attached image how the highlighted text - showing that code which is 
currently executing - doesn't line up with syntactic boundaries.

The topmost frame also doesn't highlight correctly, but the first 
(interesting) frame - UndefinedObject>>DoIt - does (highlighting the 
block in  "y value: [...]".

Now clearly the debugger's showing some pretty-printed text, but what's 
strange is that the first frame highlights correctly, but the subsequent 
ones don't. I had expected that if pretty printing knocked the 
highlighting out of alignment, that would be true for _all_ frames.

frank
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