[Issue 6167] New: RefCounted and lazy/delegate

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6167

           Summary: RefCounted and lazy/delegate
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: jsancio at gmail.com


--- Comment #0 from Jose Garcia <jsancio at gmail.com> 2011-06-16 15:57:31 PDT ---
I am not sure what is going but this maybe a dmd bug so filing here. The
following program:


import std.typecons;
import std.exception;

struct Struct
{
   this(int dummy) { refCount = RefCounted!Impl(Impl(dummy)); }
   ~this() {}

   RefCounted!Impl refCount;

   struct Impl { int dummy; }

   Struct fun(bool now)
   {
      if(now) throw new Exception("");
      return Struct(1);
   }
}

void lazyFun(lazy Struct exp)
{
   try { exp(); } catch(Exception e) {}
}

void delegateFun(Struct delegate() exp)
{
   try { exp(); } catch(Exception e) {}
}

void main()
{
   auto var = Struct(1);

   try { auto result = var.fun(true); } catch(Exception e) {}

   delegateFun({ return var.fun(true); }); // segfaults
   lazyFun(var.fun(true)); // segfaults
   assertThrown(var.fun(true)); // segfaults
}

Produces the following nonsensical output:
_RefCounted at 95F9410: initialized with (Impl _param_0)
RefCounted!(Impl)@B74B8E40: decrement refcount to 157258767
RefCounted!(Impl)@B74B8E40: decrement refcount to 157258766
RefCounted!(Impl)@95F940E: decrement refcount to 65535

Notice the value of the refcount!

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