1 files changed, 15 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/bug831087.js b/js/src/jit-test/tests/ion/bug831087.js
new file mode 100644
index 000000000..fb672075d
--- /dev/null
+++ b/js/src/jit-test/tests/ion/bug831087.js
@@ -0,0 +1,15 @@
+function isNegZero(x) {
+  return x===0 && (1/x)===-Infinity;
+}
+
+try {
+    for (y = 0; y < 1; y++) {
+        x = y;
+    }
+} catch (e) {}
+
+function f() {
+    (x /= -9)
+}
+f()
+assertEq(isNegZero(this.x), true);