[svn r5] Initial commit. Most things are very rough.

test/c.d

@@ -0,0 +1,10 @@
+module c;
+
+void main()
+{
+    ushort a = 0xFFF0;
+    ushort b = 0x0FFF;
+    auto t = a & b;
+    a &= b;
+    assert(t == a);
+}