Allow use of pointers in vectors.

test/unit/regression/vecpointer.c3

@@ -0,0 +1,29 @@
+module vecpointer @test;
+
+fn void pointer_add_sub_diff()
+{
+	int[5] a;
+	void*[<2>] x = { &a[0], &a[4] };
+	int*[<2>] y = x;
+	assert(x[0] == y[0] && x[1] == y[1]);
+	int*[2] y2;
+	y2 = y;
+	assert(y2[0] == x[0] && y2[1] == x[1]);
+	y = { null, null };
+	assert(y[0] == null && y[0] == null);
+	y = y2;
+	assert(x[0] == y[0] && x[1] == y[1]);
+	int[<2>] z = { 1, -1 };
+	y = y + z;
+	assert(y[0] == &a[1] && y[1] == &a[3]);
+	y = y - z;
+	assert(y[0] == &a[0] && y[1] == &a[4]);
+	int*[<2>] yy = { &a[1], &a[2] };
+	isz[<2>] w;
+	w = y - yy;
+	assert(w == { -1, 2 });
+	int*[<2>] zz = y - (y - yy);
+	assert(zz[0] == &a[1] && zz[1] == &a[2]);
+	int[*]*[<2>] g = int[2]*[<2>] { null, null };
+	int[*]*[<*>] g2 = int[2]*[<2>] { null, null };
+}