1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/recover-rest-osr.js b/js/src/jit-test/tests/ion/recover-rest-osr.js
new file mode 100644
index 0000000000..a8f88cd5f7
--- /dev/null
+++ b/js/src/jit-test/tests/ion/recover-rest-osr.js
@@ -0,0 +1,28 @@
+setJitCompilerOption("baseline.warmup.trigger", 0);
+setJitCompilerOption("ion.warmup.trigger", 120);
+gczeal(0);
+
+with ({}) {}
+
+function bar(...rest) {
+  // |rest| can be recovered, even if this is inlined into an OSR script.
+  assertRecoveredOnBailout(rest, true);
+  return rest[0];
+}
+
+function foo(n, ...rest) {
+  // |rest| for an OSR script can't be recovered.
+  assertRecoveredOnBailout(rest, false);
+  var sum = 0;
+  for (var i = 0; i < n; i++) {
+    sum += bar(i);
+  }
+  trialInline();
+  return sum;
+}
+
+// Trigger trial-inlining of bar into foo.
+foo(110);
+
+// OSR-compile foo.
+assertEq(foo(1000), 499500);