Here's the code to handle the mustBeBoolean case. It also handles the possible stack inconsistency I mentioned earlier.
Note that this changeset requires the earlier one, of course.

Have fun!
Hans-Martin

Doug Way wrote:

> One other nice thing to fix at some point would be the PC highlighting for NonBoolean receiver errors. For example, if you Do this in a workspace:
>
> nil ifTrue: [x _ 'asdfas' asSortedCollection].
>
> The NonBoolean receiver debugger comes up, but the #asSortedCollection method is currently highlighted, when it seems that #ifTrue: should be highlighted instead.
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