Access Violation in callback from sort

[Steven Schveighoffer]

On Wed, 02 May 2012 11:27:57 -0400, Jabb <jj.jabbaloo at gmail.com> wrote:

> Just got the TDPL book and it's a great read! I learn best when typing  
> out the code myself, so I decided to make a single VisualD project and  
> put the different exercises in separate modules. I am having problems  
> with sort in std.algorithms - well, actually it appears to be a closure  
> problem when sort calls my delegate.

There shouldn't be any closure here, sort is not storing the delegate  
pointer.

> Here's a sample of the problem - in main.d I have
>
> //------------------
> module main;
> import std.algorithm;
> void main() {
> 	uint[string] counts = [ "a":4, "b":5, "c":3, "d":1 ];
> 	string[] keys = counts.keys;
>
> 	sort!((a, b) { return counts[a] > counts[b]; })(keys);
> }
> //------------------
>
> Alone this works just fine. But if I add another file called myalgs.d,  
> and put the following in it:
>
> //------------------
> module myalgs;
> import std.algorithm;
> //------------------
>
> Then I get the following exception:
>
> object.Error: Access Violation
> ----------------
> C:\D\dmd2\windows\bin\..\..\src\phobos\std\algorithm.d(7112):  
> mainmain__T8sortImplS14main9__lambda3VE3std9algorithm12SwapStrategy0TAAyaZsortImpl
> ----------------
>
> Steping through the code it appears that the Access Violation occurs  
> when accessing counts[a].
>
> I am using DMD32 v2.059; my compilation command line looks like:
> dmd -g -debug -X -Xf"$(IntDir)\$(TargetName).json"  
> -deps="$(OutDir)\$(ProjectName).dep"  
> -of"$(OutDir)\$(ProjectName).exe_cv" -map  
> "$(INTDIR)\$(SAFEPROJECTNAME).map" -L/NOMAP

I can't see any errors, I think this is worthy of a bug report, it's nice  
and small and self-contained.

http://d.puremagic.com/issues

-Steve