Using an arithmetic operations on arrays causes bus errors when compiling with DMD 2.046 on Mac OS 10.6.3.

void main ()
{
  auto vec = new double[10];

  foreach(i, ref x; vec) { x = cast(double) i; }

  vec[] *= 0.5; 
}

This compiles with no errors or warnings, and a bus error results when the resulting binary is executed.