[plt-scheme] DrScheme buglet?

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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> >
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>