1 files changed, 17 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/auto-regress/bug1783507.js b/js/src/jit-test/tests/auto-regress/bug1783507.js
new file mode 100644
index 0000000000..a7a4fd7f57
--- /dev/null
+++ b/js/src/jit-test/tests/auto-regress/bug1783507.js
@@ -0,0 +1,17 @@
+function main(x) {
+  var ta = new Int32Array(10);
+
+  for (var i = 0; i < 100; ++i) {
+    // MCompare::Compare_UIntPtr with result only used on bailout.
+    var r = 0 in ta;
+
+    // Path only entered through bailout condition.
+    if (x) {
+      // |r| must be recovered on bailout here.
+      x(r);
+    }
+  }
+}
+
+main();
+main(() => {});