corrects alias u3dq (u3nt -> u3nq)
# define u3do(txt_c, arg) u3v_do(txt_c, arg)
# define u3dc(txt_c, a, b) u3v_do(txt_c, u3nc(a, b))
# define u3dt(txt_c, a, b, c) u3v_do(txt_c, u3nt(a, b, c))
-# define u3dq(txt_c, a, b, c, d) u3v_do(txt_c, u3nt(a, b, c, d))
+# define u3dq(txt_c, a, b, c, d) u3v_do(txt_c, u3nq(a, b, c, d))
/* u3to(), u3of(): offset/pointer conversion.
*/
