isBuiltinType

class C;
union U;
struct S;
interface I;

static assert( isBuiltinType!void);
static assert( isBuiltinType!string);
static assert( isBuiltinType!(int[]));
static assert( isBuiltinType!(C[string]));
static assert( isBuiltinType!(typeof(null)));
static assert(!isBuiltinType!C);
static assert(!isBuiltinType!U);
static assert(!isBuiltinType!S);
static assert(!isBuiltinType!I);
static assert(!isBuiltinType!(void delegate(int)));