I'm upgrading our product from VC6 to the VC7 compiler and
came across the C1001 error:

fatal error C1001: INTERNAL COMPILER ERROR (compiler
file 'f:\vs70builds\3077\vc\Compiler\CxxFE\sl\P1
\C\toil.c', line 6931)

I've managed to reliably reproduce it using the few lines
of code below that does not use any of my own product code:

#import "c:\windows\system32\dxtmsft.dll" no_namespace

int main()
{
  float f;
  int i;

  IDXTRevealTrans *rev;
  //... initialise rev ...
  i = rev->Transition;    // int works
  i = (rev->Transition);  // int works
  f = rev->Duration;      // float works
  f = (rev->Duration);    // float fails!

  return 0;
}

Adding brackets around a the float property fails whilst
the int is fine with or without brackets.  Unfortunately I
cannot get away without using the brackets in the
particular bit of code in my product.  The only way I can
work around it is to use a temporary float variable as a
go-between.

Can someone give me an explanation or proper fix?