[plt-scheme] displaying errors in custom language levels

> I, for one, am not able to guess what's going wrong from what you write 
> below. But if you can produce a simple tool or perhaps produce a small 
> example just using `eval' in the graphical language, I may be able to 
> spot what's going wrong.

Okay, I've attached a few files that go in a collect called 
`little-lang' -- put it in a PLTCOLLECTS-enabled directory and run 
setup-plt. Then restart DrScheme and select the "A Little Language" 
language.

> For general edification, DrScheme's red arrows and stacktrace in the bug 
> icon window in the debugging languages work by using the errortrace 
> annotations. In the non-debugging languages, they work by extracting the 
> information that mzscheme records for the stack traces (see the mz 
> manual for those details).

Okay, I'll try to digest the errortrace docs next, thanks.

> Are you talking about those errors or some other kind of errors? Syntax 
> errors, perhaps? Those work by extracting fields from the exn records.

These are the errors I'm talking about: not syntax errors, but runtime 
errors. For example, in the attached language, try executing the expression:

    > (42 fun x.x)

You'll get a runtime error with no source highlighting or red arrows.

Thanks for the help,
Dave

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