diff --git a/test/runtime/samples/bitmask-overflow/_config.js b/test/runtime/samples/bitmask-overflow/_config.js
new file mode 100644
index 0000000000..7d550da056
--- /dev/null
+++ b/test/runtime/samples/bitmask-overflow/_config.js
@@ -0,0 +1,97 @@
+export default {
+	html: `
+		<p>0</p>
+		<p>1</p>
+		<p>2</p>
+		<p>3</p>
+		<p>4</p>
+		<p>5</p>
+		<p>6</p>
+		<p>7</p>
+		<p>8</p>
+		<p>9</p>
+		<p>10</p>
+		<p>11</p>
+		<p>12</p>
+		<p>13</p>
+		<p>14</p>
+		<p>15</p>
+		<p>16</p>
+		<p>17</p>
+		<p>18</p>
+		<p>19</p>
+		<p>20</p>
+		<p>21</p>
+		<p>22</p>
+		<p>23</p>
+		<p>24</p>
+		<p>25</p>
+		<p>26</p>
+		<p>27</p>
+		<p>28</p>
+		<p>29</p>
+		<p>30</p>
+		<p>31</p>
+		<p>32</p>
+		<p>33</p>
+		<p>34</p>
+		<p>35</p>
+		<p>36</p>
+		<p>37</p>
+		<p>38</p>
+		<p>39</p>
+		<p>40</p>
+	`,
+
+	test({ assert, component, target }) {
+		component._0 = 'a';
+		component._30 = 'b';
+		component._31 = 'c';
+		component._32 = 'd';
+		component._40 = 'e';
+
+		assert.htmlEqual(target.innerHTML, `
+			<p>a</p>
+			<p>1</p>
+			<p>2</p>
+			<p>3</p>
+			<p>4</p>
+			<p>5</p>
+			<p>6</p>
+			<p>7</p>
+			<p>8</p>
+			<p>9</p>
+			<p>10</p>
+			<p>11</p>
+			<p>12</p>
+			<p>13</p>
+			<p>14</p>
+			<p>15</p>
+			<p>16</p>
+			<p>17</p>
+			<p>18</p>
+			<p>19</p>
+			<p>20</p>
+			<p>21</p>
+			<p>22</p>
+			<p>23</p>
+			<p>24</p>
+			<p>25</p>
+			<p>26</p>
+			<p>27</p>
+			<p>28</p>
+			<p>29</p>
+			<p>b</p>
+			<p>c</p>
+			<p>d</p>
+			<p>33</p>
+			<p>34</p>
+			<p>35</p>
+			<p>36</p>
+			<p>37</p>
+			<p>38</p>
+			<p>39</p>
+			<p>e</p>
+		`);
+	}
+};
\ No newline at end of file
diff --git a/test/runtime/samples/bitmask-overflow/main.svelte b/test/runtime/samples/bitmask-overflow/main.svelte
new file mode 100644
index 0000000000..20216786c2
--- /dev/null
+++ b/test/runtime/samples/bitmask-overflow/main.svelte
@@ -0,0 +1,85 @@
+<script>
+	export let _0 = '0';
+	export let _1 = '1';
+	export let _2 = '2';
+	export let _3 = '3';
+	export let _4 = '4';
+	export let _5 = '5';
+	export let _6 = '6';
+	export let _7 = '7';
+	export let _8 = '8';
+	export let _9 = '9';
+	export let _10 = '10';
+	export let _11 = '11';
+	export let _12 = '12';
+	export let _13 = '13';
+	export let _14 = '14';
+	export let _15 = '15';
+	export let _16 = '16';
+	export let _17 = '17';
+	export let _18 = '18';
+	export let _19 = '19';
+	export let _20 = '20';
+	export let _21 = '21';
+	export let _22 = '22';
+	export let _23 = '23';
+	export let _24 = '24';
+	export let _25 = '25';
+	export let _26 = '26';
+	export let _27 = '27';
+	export let _28 = '28';
+	export let _29 = '29';
+	export let _30 = '30';
+	export let _31 = '31';
+	export let _32 = '32';
+	export let _33 = '33';
+	export let _34 = '34';
+	export let _35 = '35';
+	export let _36 = '36';
+	export let _37 = '37';
+	export let _38 = '38';
+	export let _39 = '39';
+	export let _40 = '40';
+</script>
+
+<p>{_0}</p>
+<p>{_1}</p>
+<p>{_2}</p>
+<p>{_3}</p>
+<p>{_4}</p>
+<p>{_5}</p>
+<p>{_6}</p>
+<p>{_7}</p>
+<p>{_8}</p>
+<p>{_9}</p>
+<p>{_10}</p>
+<p>{_11}</p>
+<p>{_12}</p>
+<p>{_13}</p>
+<p>{_14}</p>
+<p>{_15}</p>
+<p>{_16}</p>
+<p>{_17}</p>
+<p>{_18}</p>
+<p>{_19}</p>
+<p>{_20}</p>
+<p>{_21}</p>
+<p>{_22}</p>
+<p>{_23}</p>
+<p>{_24}</p>
+<p>{_25}</p>
+<p>{_26}</p>
+<p>{_27}</p>
+<p>{_28}</p>
+<p>{_29}</p>
+<p>{_30}</p>
+<p>{_31}</p>
+<p>{_32}</p>
+<p>{_33}</p>
+<p>{_34}</p>
+<p>{_35}</p>
+<p>{_36}</p>
+<p>{_37}</p>
+<p>{_38}</p>
+<p>{_39}</p>
+<p>{_40}</p>
\ No newline at end of file