Scoped local variables

Jason House jason.james.house at gmail.com
Fri Dec 7 14:03:19 PST 2007


Frank Benoit Wrote:

> It is a bug. I can reproduce it on linux/dmd.
> Would you mind to file a bug report?

Before I'd do, I'd like to know if the following things make a difference:

1. Tango vs. Phobos
2. Latest D 1.x vs. latest D 2.x


> 
> 
> Jason House schrieb:
> > Denton Cockburn Wrote:
> > 
> >> On Fri, 07 Dec 2007 09:52:07 -0500, Jason House wrote:
> >>
> >>> I'm having my code crash when I add in scope variables.  While it works
> >>> in some cases, it doesn't in others.  I've whittled down my current
> >>> problem to code that looks like:
> >>>
> >>> unittest{
> >>>   scope T t = new T();
> >>> }
> >>>
> >>> "T" has a bunch of arrays that it allocates and fills when it's
> >>> constructed.  I'm currently confused how this code would cause a crash. 
> >>> Any insights would be much appreciated.
> >> Need more information.
> >> What's the message given when it crashes?
> > 
> > It's a windows error:
> > housebot-0.7 has encountered a problem and needs to close.  We are sorry for the inconvenience. If you were in the middle of something, the information you were working on might be lost.
> > 
> > 
> >> Is the cause of the crash the fact that it's scoped?  
> > 
> > As best as I can tell.
> > 
> >> Have you tried without scope?
> > 
> > Yes, it works flawlessly without the scope.
> > 
> >> Are you sure it's not in the constructor of T?
> > 
> > I am now.  I stripped it down to an empty constructor and removed all member variables.
> > 
> > Since posting, I've reduced this down to a simple example.  This example sometimes crashes dmd itself instead of producing a crashing executable. I'm using dmd 1.018 with Tango 0.99.  Now that I know it's dmd and not me, I may try upgrading the version of dmd that I use.
> > 
> > version=crash;
> > //version=work1;
> > //version=work2;
> > //version=work3;
> > 
> > interface I{
> > }
> > 
> > class C : public I{
> > }
> > 
> > unittest{
> >         version(crash) scope I def = new C;
> >         version(work1) scope C def = new C;
> >         version(work2)       I def = new C;
> >         version(work3)       C def = new C;
> > }
> > 
> > int main(){
> >         return 0;
> > }



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