Now that we're using LLVM 2.5, we can stop always running the CFGSimplification pass. The pass was originally added as a workaround for a LLVM 2.4 bug where debug info would reference labels that have been optimized away.

module nested4;

void func(void delegate() dg) {
  auto v = (){
    dg();
  };
}

void main()
{
    func({});
}