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-rw-r--r--js/src/jit-test/tests/sharedbuf/sab-gating.js4
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diff --git a/js/src/jit-test/tests/sharedbuf/sab-gating.js b/js/src/jit-test/tests/sharedbuf/sab-gating.js
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index 0000000000..0f7cd07c8d
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+++ b/js/src/jit-test/tests/sharedbuf/sab-gating.js
@@ -0,0 +1,4 @@
+// Check gating of shared memory features in plain js (bug 1231338).
+
+assertEq(sharedMemoryEnabled(), !!this.SharedArrayBuffer);
+assertEq(sharedMemoryEnabled(), !!this.Atomics);