<code>
void main()
{
  bit b;
  char[] s1 = b ? "foo" : "foo"; // ok
  char[] s2 = b ? null : null; // ok
  char[] s3 = b ? null : "foo"; // error
  char[] s4 = b ? "foo" : null; // error
}
</code>

str.d(6): cannot convert string literal to void*
str.d(6): cannot implicitly convert expression b ? null : cast(void*)("foo") of type void* to char
[]
str.d(7): cannot convert string literal to void*
str.d(7): cannot implicitly convert expression b ? cast(void*)("foo") : null of type void* to char
[]

// DMD 0.113