1 files changed, 14 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/bug1782558-veclen.js b/js/src/jit-test/tests/bug1782558-veclen.js
new file mode 100644
index 0000000000..a8f1a48ea9
--- /dev/null
+++ b/js/src/jit-test/tests/bug1782558-veclen.js
@@ -0,0 +1,14 @@
+// |jit-test| skip-if: getBuildConfiguration()["pointer-byte-size"] > 4 || getBuildConfiguration()["android"]
+
+// On 64-bit, this will allocate 2G temporary strings for keys while
+// stringifying the Array, which takes a rather long time and doesn't have the
+// potential of the problematic overflowing anyway.
+
+try {
+    let x = [];
+    x.length = Math.pow(2, 32) - 1;
+    x + 1;
+    assertEq(true, false, "overflow expected");
+} catch (e) {
+    assertEq((e + "").includes("InternalError: allocation size overflow"), true);
+}