&URL{
			Scheme: "http",
			Host:   "[fe80::1%en01-._~]:8080",
			Path:   "/",
		},
		"http://[fe80::1%25en01-._~]:8080/",
	},
	// alternate escapings of path survive round trip
	{
		"http://rest.rsc.io/foo%2fbar/baz%2Fquux?alt=media",
		&URL{
			Scheme:   "http",
			Host:     "rest.rsc.io",
			Path:     "/foo/bar/baz/quux",
			RawPath:  "/foo%2fbar/baz%2Fquux",

				wantJSON, _ := Marshal(tt.out)
				t.Fatalf("%s: Decode:\n\tgot:  %#+v\n\twant: %#+v\n\n\tgotJSON:  %s\n\twantJSON: %s", tt.Where, got, tt.out, gotJSON, wantJSON)
			}

			// Check round trip also decodes correctly.
			if tt.err == nil {
				enc, err := Marshal(v.Interface())
				if err != nil {
					t.Fatalf("%s: Marshal error after roundtrip: %v", tt.Where, err)
				}

	// Before index worked on reflect.Values, interface values
	// were always implicitly promoted to the underlying value,
	// except that nil interfaces were promoted to the zero reflect.Value.
	// Eliminating a round trip to interface{} and back to reflect.Value
	// eliminated this promotion, breaking these cases.
	tests := []struct {
		text string
		out  string
	}{
		{`{{index .Nil 1}}`, "ERROR: index of untyped nil"},

//	    out, err := hex.DecodeString(enc)
//	    if err != nil {
//	      t.Fatalf("%v: decode: %v", in, err)
//	    }
//	    if !bytes.Equal(in, out) {
//	      t.Fatalf("%v: not equal after round trip: %v", in, out)
//	    }
//	  })
//	}
//
// A fuzz test maintains a seed corpus, or a set of inputs which are run by
// default, and can seed input generation. Seed inputs may be registered by

// testing.
var errRequestCanceled = http2errRequestCanceled
var errRequestCanceledConn = errors.New("net/http: request canceled while waiting for connection") // TODO: unify?

// errRequestDone is used to cancel the round trip Context after a request is successfully done.
// It should not be seen by the user.
var errRequestDone = errors.New("net/http: request completed")

func nop() {}

// testHooks. Always non-nil.
var (