1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/realms/bug1385890-c50.js b/js/src/jit-test/tests/realms/bug1385890-c50.js
new file mode 100644
index 0000000000..34dc346c93
--- /dev/null
+++ b/js/src/jit-test/tests/realms/bug1385890-c50.js
@@ -0,0 +1,20 @@
+// |jit-test| skip-if: !this.hasOwnProperty("ReadableStream")
+// See <https://bugzilla.mozilla.org/show_bug.cgi?id=1385890#c50>.
+
+let otherGlobal = newGlobal();
+function getFreshInstances(type, otherType = type) {
+    stream = new ReadableStream({
+        start(c) {
+            controller = c;
+        },
+        type
+    });
+}
+getFreshInstances();
+let [branch1, branch2] = otherGlobal.ReadableStream.prototype.tee.call(stream);
+cancelPromise1 = ReadableStream.prototype.cancel.call(branch1, {
+    name: "cancel 1"
+});
+cancelPromise2 = ReadableStream.prototype.cancel.call(branch2, {
+    name: "cancel 2"
+});