case pack(0, ARNG_4H, ARNG_4S):
			immh, width = 2, 16
		case pack(1, ARNG_8H, ARNG_4S):
			immh, width = 2, 16
		case pack(0, ARNG_2S, ARNG_2D):
			immh, width = 4, 32
		case pack(1, ARNG_4S, ARNG_2D):
			immh, width = 4, 32
		default:
			c.ctxt.Diag("operand mismatch: %v\n", p)
		}
		if !(0 <= shift && shift <= int(width-1)) {
			c.ctxt.Diag("shift amount out of range: %v\n", p)
		}

	428:  {region: 0x99, script: 0x5b, flags: 0x0},
	429:  {region: 0x166, script: 0x5b, flags: 0x0},
	430:  {region: 0xdc, script: 0x22, flags: 0x0},
	431:  {region: 0x166, script: 0x5b, flags: 0x0},
	432:  {region: 0x166, script: 0x5, flags: 0x0},
	433:  {region: 0x49, script: 0x5b, flags: 0x0},
	434:  {region: 0x166, script: 0x5, flags: 0x0},
	435:  {region: 0x166, script: 0x5b, flags: 0x0},

	case 43: /* data cache instructions: op (Ra+[Rb]), [th|l] */
		/* TH field for dcbt/dcbtst: */
		/* 0 = Block access - program will soon access EA. */
		/* 8-15 = Stream access - sequence of access (data stream). See section 4.3.2 of the ISA for details. */
		/* 16 = Block access - program will soon make a transient access to EA. */
		/* 17 = Block access - program will not access EA for a long time. */

		/* L field for dcbf: */

	w.Header().Set("Content-Length", "1")
	w.Header().Set("Content-Encoding", "ascii")
	w.Header().Set("X-Content-Type-Options", "scratch and sniff")
	w.Header().Set("Other", "foo")
	Error(w, "oops", 432)

	h := w.Header()
	for _, hdr := range []string{"Content-Length", "Content-Encoding"} {
		if v, ok := h[hdr]; ok {
			t.Errorf("%s: %q, want not present", hdr, v)
		}
	}