[plt-scheme] DrScheme buglet?

I am missing the yellow warning. (I did read the messages out of order.)

On Aug 31, 2007, at 12:31 PM, Robby Findler wrote:

> Did you try the current drscheme? :)
>
> On 8/31/07, Matthias Felleisen <matthias at ccs.neu.edu> wrote:
>> I second Ryan's proposal.
>>
>> On Aug 29, 2007, at 11:17 AM, Ryan Culpepper wrote:
>>
>>> On Wed, 2007-08-29 at 08:52 -0500, Robby Findler wrote:
>>>> This only happens when there are syntax errors, right? Not runtime
>>>> errors?
>>>>
>>>> I think that's just a property of the way teachpacks work in the
>>>> current world. I'm not sure it is possible to get around that.
>>>>
>>>> Roughly, what's happening underneath the hood, is that the  
>>>> teachpack
>>>> is (an invisible) part of your program and, when your program is
>>>> syntactically malformed, no part of your program is available in  
>>>> the
>>>> REPL. For example, in this program:
>>>>
>>>>   (define x 1)
>>>>   unbound-id
>>>>
>>>> You won't be able to use "x" in the REPL. But, in this one, you  
>>>> will:
>>>>
>>>>   (define x 1)
>>>>   (first empty)
>>>>
>>>> I know that's not real help, but I hope it is at least explanatory.
>>>>
>>>> And maybe this will inspire someone (Matthew?) to think of a way
>>>> to do
>>>> better, I'm not sure.
>>>
>>> Would it make sense to make that explanation part of DrScheme? That
>>> is:
>>>
>>> When a syntax error occurs, print a message to the effect of "No
>>> definitions executed due to syntax error" in the interactions
>>> window and
>>> lock the interactions editor.
>>>
>>> Or instead of locking the interactions, DrScheme could instead  
>>> display
>>> one of those yellow highlighted messages (like "definitions out of
>>> sync"
>>> is displayed now) before every interaction. That would let students
>>> use
>>> the interactions window to stumble around trying out syntaxes until
>>> they
>>> find the right one.
>>>
>>> Ryan
>>>
>>>
>>>> On 8/29/07, Todd O'Bryan <toddobryan at mac.com> wrote:
>>>>> In v371 of DrScheme, it appears that teachpacks don't "stick."
>>>>>
>>>>> When you first open a DrScheme window, even though it says that a
>>>>> teachpack is loaded, it's unavailable until you hit Run.
>>>>>
>>>>> That's not a big problem, but the teachpacks disappear if  
>>>>> there's an
>>>>> error during a Run. In other words, if students are developing a
>>>>> function, hit run, and have an error, if they drop down to the
>>>>> interactions window to experiment, the functions provided by the
>>>>> teachpack are no longer available.
>>>>>
>>>>> The workaround is to comment out offending code in the definitions
>>>>> window, but this is kind of a pain.
>>>>>
>>>>> Todd
>>>>>
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>>>>>
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>>
>>