Add m-esr52 at 52.6.0

21 files changed, 781 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/truthiness/equal-null.js b/js/src/jit-test/tests/truthiness/equal-null.js
new file mode 100644
index 000000000..2b7d58286
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/equal-null.js
@@ -0,0 +1,37 @@
+function f(v, value)
+{
+  var b = v == null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, false);
+f({}, false);
+f(null, true);
+f(null, true);
+f(undefined, true);
+f(undefined, true);
+f(objectEmulatingUndefined(), true);
+f(objectEmulatingUndefined(), true);
+f(Object.prototype, false);
+f(Object.prototype, false);
+
+function g(v, value)
+{
+  var b = v == null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, false);
+g({}, false);
+
+function h(v, value)
+{
+  var b = v == null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), true);
+h(objectEmulatingUndefined(), true);
diff --git a/js/src/jit-test/tests/truthiness/equal-undefined.js b/js/src/jit-test/tests/truthiness/equal-undefined.js
new file mode 100644
index 000000000..5d76f93a1
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/equal-undefined.js
@@ -0,0 +1,37 @@
+function f(v, value)
+{
+  var b = v == undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, false);
+f({}, false);
+f(null, true);
+f(null, true);
+f(undefined, true);
+f(undefined, true);
+f(objectEmulatingUndefined(), true);
+f(objectEmulatingUndefined(), true);
+f(Object.prototype, false);
+f(Object.prototype, false);
+
+function g(v, value)
+{
+  var b = v == undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, false);
+g({}, false);
+
+function h(v, value)
+{
+  var b = v == undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), true);
+h(objectEmulatingUndefined(), true);
diff --git a/js/src/jit-test/tests/truthiness/if-equal-null.js b/js/src/jit-test/tests/truthiness/if-equal-null.js
new file mode 100644
index 000000000..f487ea349
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/if-equal-null.js
@@ -0,0 +1,46 @@
+var counterF = 0;
+
+function f(v, value)
+{
+  if (v == null)
+    counterF++;
+  assertEq(counterF, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, 0);
+f({}, 0);
+f(null, 1);
+f(null, 2);
+f(undefined, 3);
+f(undefined, 4);
+f(objectEmulatingUndefined(), 5);
+f(objectEmulatingUndefined(), 6);
+f(Object.prototype, 6);
+f(Object.prototype, 6);
+
+var counterG = 0;
+
+function g(v, value)
+{
+  if (v == null)
+    counterG++;
+  assertEq(counterG, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, 0);
+g({}, 0);
+
+var counterH = 0;
+
+function h(v, value)
+{
+  if (v == null)
+    counterH++;
+  assertEq(counterH, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), 1);
+h(objectEmulatingUndefined(), 2);
diff --git a/js/src/jit-test/tests/truthiness/if-equal-undefined.js b/js/src/jit-test/tests/truthiness/if-equal-undefined.js
new file mode 100644
index 000000000..fd7d2abe4
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/if-equal-undefined.js
@@ -0,0 +1,46 @@
+var counterF = 0;
+
+function f(v, value)
+{
+  if (v == undefined)
+    counterF++;
+  assertEq(counterF, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, 0);
+f({}, 0);
+f(null, 1);
+f(null, 2);
+f(undefined, 3);
+f(undefined, 4);
+f(objectEmulatingUndefined(), 5);
+f(objectEmulatingUndefined(), 6);
+f(Object.prototype, 6);
+f(Object.prototype, 6);
+
+var counterG = 0;
+
+function g(v, value)
+{
+  if (v == undefined)
+    counterG++;
+  assertEq(counterG, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, 0);
+g({}, 0);
+
+var counterH = 0;
+
+function h(v, value)
+{
+  if (v == undefined)
+    counterH++;
+  assertEq(counterH, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), 1);
+h(objectEmulatingUndefined(), 2);
diff --git a/js/src/jit-test/tests/truthiness/if-not-equal-null.js b/js/src/jit-test/tests/truthiness/if-not-equal-null.js
new file mode 100644
index 000000000..a31aa78ee
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/if-not-equal-null.js
@@ -0,0 +1,46 @@
+var counterF = 0;
+
+function f(v, value)
+{
+  if (v != null)
+    counterF++;
+  assertEq(counterF, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, 1);
+f({}, 2);
+f(null, 2);
+f(null, 2);
+f(undefined, 2);
+f(undefined, 2);
+f(objectEmulatingUndefined(), 2);
+f(objectEmulatingUndefined(), 2);
+f(Object.prototype, 3);
+f(Object.prototype, 4);
+
+var counterG = 0;
+
+function g(v, value)
+{
+  if (v != null)
+    counterG++;
+  assertEq(counterG, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, 1);
+g({}, 2);
+
+var counterH = 0;
+
+function h(v, value)
+{
+  if (v != null)
+    counterH++;
+  assertEq(counterH, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), 0);
+h(objectEmulatingUndefined(), 0);
diff --git a/js/src/jit-test/tests/truthiness/if-not-equal-undefined.js b/js/src/jit-test/tests/truthiness/if-not-equal-undefined.js
new file mode 100644
index 000000000..583959d36
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/if-not-equal-undefined.js
@@ -0,0 +1,46 @@
+var counterF = 0;
+
+function f(v, value)
+{
+  if (v != undefined)
+    counterF++;
+  assertEq(counterF, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, 1);
+f({}, 2);
+f(null, 2);
+f(null, 2);
+f(undefined, 2);
+f(undefined, 2);
+f(objectEmulatingUndefined(), 2);
+f(objectEmulatingUndefined(), 2);
+f(Object.prototype, 3);
+f(Object.prototype, 4);
+
+var counterG = 0;
+
+function g(v, value)
+{
+  if (v != undefined)
+    counterG++;
+  assertEq(counterG, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, 1);
+g({}, 2);
+
+var counterH = 0;
+
+function h(v, value)
+{
+  if (v != undefined)
+    counterH++;
+  assertEq(counterH, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), 0);
+h(objectEmulatingUndefined(), 0);
diff --git a/js/src/jit-test/tests/truthiness/if-strict-equal-null.js b/js/src/jit-test/tests/truthiness/if-strict-equal-null.js
new file mode 100644
index 000000000..1c9e829fe
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/if-strict-equal-null.js
@@ -0,0 +1,46 @@
+var counterF = 0;
+
+function f(v, value)
+{
+  if (v === null)
+    counterF++;
+  assertEq(counterF, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, 0);
+f({}, 0);
+f(null, 1);
+f(null, 2);
+f(undefined, 2);
+f(undefined, 2);
+f(objectEmulatingUndefined(), 2);
+f(objectEmulatingUndefined(), 2);
+f(Object.prototype, 2);
+f(Object.prototype, 2);
+
+var counterG = 0;
+
+function g(v, value)
+{
+  if (v === null)
+    counterG++;
+  assertEq(counterG, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, 0);
+g({}, 0);
+
+var counterH = 0;
+
+function h(v, value)
+{
+  if (v === null)
+    counterH++;
+  assertEq(counterH, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), 0);
+h(objectEmulatingUndefined(), 0);
diff --git a/js/src/jit-test/tests/truthiness/if-strict-equal-undefined.js b/js/src/jit-test/tests/truthiness/if-strict-equal-undefined.js
new file mode 100644
index 000000000..04ea4ee52
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/if-strict-equal-undefined.js
@@ -0,0 +1,46 @@
+var counterF = 0;
+
+function f(v, value)
+{
+  if (v === undefined)
+    counterF++;
+  assertEq(counterF, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, 0);
+f({}, 0);
+f(null, 0);
+f(null, 0);
+f(undefined, 1);
+f(undefined, 2);
+f(objectEmulatingUndefined(), 2);
+f(objectEmulatingUndefined(), 2);
+f(Object.prototype, 2);
+f(Object.prototype, 2);
+
+var counterG = 0;
+
+function g(v, value)
+{
+  if (v === undefined)
+    counterG++;
+  assertEq(counterG, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, 0);
+g({}, 0);
+
+var counterH = 0;
+
+function h(v, value)
+{
+  if (v === undefined)
+    counterH++;
+  assertEq(counterH, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), 0);
+h(objectEmulatingUndefined(), 0);
diff --git a/js/src/jit-test/tests/truthiness/if-strict-not-equal-null.js b/js/src/jit-test/tests/truthiness/if-strict-not-equal-null.js
new file mode 100644
index 000000000..6facef816
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/if-strict-not-equal-null.js
@@ -0,0 +1,46 @@
+var counterF = 0;
+
+function f(v, value)
+{
+  if (v !== null)
+    counterF++;
+  assertEq(counterF, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, 1);
+f({}, 2);
+f(null, 2);
+f(null, 2);
+f(undefined, 3);
+f(undefined, 4);
+f(objectEmulatingUndefined(), 5);
+f(objectEmulatingUndefined(), 6);
+f(Object.prototype, 7);
+f(Object.prototype, 8);
+
+var counterG = 0;
+
+function g(v, value)
+{
+  if (v !== null)
+    counterG++;
+  assertEq(counterG, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, 1);
+g({}, 2);
+
+var counterH = 0;
+
+function h(v, value)
+{
+  if (v !== null)
+    counterH++;
+  assertEq(counterH, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), 1);
+h(objectEmulatingUndefined(), 2);
diff --git a/js/src/jit-test/tests/truthiness/if-strict-not-equal-undefined.js b/js/src/jit-test/tests/truthiness/if-strict-not-equal-undefined.js
new file mode 100644
index 000000000..d75caae48
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/if-strict-not-equal-undefined.js
@@ -0,0 +1,46 @@
+var counterF = 0;
+
+function f(v, value)
+{
+  if (v !== undefined)
+    counterF++;
+  assertEq(counterF, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, 1);
+f({}, 2);
+f(null, 3);
+f(null, 4);
+f(undefined, 4);
+f(undefined, 4);
+f(objectEmulatingUndefined(), 5);
+f(objectEmulatingUndefined(), 6);
+f(Object.prototype, 7);
+f(Object.prototype, 8);
+
+var counterG = 0;
+
+function g(v, value)
+{
+  if (v !== undefined)
+    counterG++;
+  assertEq(counterG, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, 1);
+g({}, 2);
+
+var counterH = 0;
+
+function h(v, value)
+{
+  if (v !== undefined)
+    counterH++;
+  assertEq(counterH, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), 1);
+h(objectEmulatingUndefined(), 2);
diff --git a/js/src/jit-test/tests/truthiness/if.js b/js/src/jit-test/tests/truthiness/if.js
new file mode 100644
index 000000000..347f9c838
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/if.js
@@ -0,0 +1,24 @@
+function t1(v)
+{
+  if (v)
+    return 1;
+  return 0;
+}
+
+assertEq(t1(objectEmulatingUndefined()), 0);
+assertEq(t1(objectEmulatingUndefined()), 0);
+assertEq(t1(objectEmulatingUndefined()), 0);
+
+function t2(v)
+{
+  if (v)
+    return 1;
+  return 0;
+}
+
+assertEq(t2(17), 1);
+assertEq(t2(0), 0);
+assertEq(t2(-0), 0);
+assertEq(t2(objectEmulatingUndefined()), 0);
+assertEq(t2(objectEmulatingUndefined()), 0);
+assertEq(t2(objectEmulatingUndefined()), 0);
diff --git a/js/src/jit-test/tests/truthiness/not-equal-null.js b/js/src/jit-test/tests/truthiness/not-equal-null.js
new file mode 100644
index 000000000..ffb62e1d6
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/not-equal-null.js
@@ -0,0 +1,37 @@
+function f(v, value)
+{
+  var b = v != null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, true);
+f({}, true);
+f(null, false);
+f(null, false);
+f(undefined, false);
+f(undefined, false);
+f(objectEmulatingUndefined(), false);
+f(objectEmulatingUndefined(), false);
+f(Object.prototype, true);
+f(Object.prototype, true);
+
+function g(v, value)
+{
+  var b = v != null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, true);
+g({}, true);
+
+function h(v, value)
+{
+  var b = v != null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), false);
+h(objectEmulatingUndefined(), false);
diff --git a/js/src/jit-test/tests/truthiness/not-equal-undefined.js b/js/src/jit-test/tests/truthiness/not-equal-undefined.js
new file mode 100644
index 000000000..a913a67f2
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/not-equal-undefined.js
@@ -0,0 +1,37 @@
+function f(v, value)
+{
+  var b = v != undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, true);
+f({}, true);
+f(null, false);
+f(null, false);
+f(undefined, false);
+f(undefined, false);
+f(objectEmulatingUndefined(), false);
+f(objectEmulatingUndefined(), false);
+f(Object.prototype, true);
+f(Object.prototype, true);
+
+function g(v, value)
+{
+  var b = v != undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, true);
+g({}, true);
+
+function h(v, value)
+{
+  var b = v != undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), false);
+h(objectEmulatingUndefined(), false);
diff --git a/js/src/jit-test/tests/truthiness/not.js b/js/src/jit-test/tests/truthiness/not.js
new file mode 100644
index 000000000..4adccdaff
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/not.js
@@ -0,0 +1,24 @@
+function t1(v)
+{
+  if (!v)
+    return 1;
+  return 0;
+}
+
+assertEq(t1(objectEmulatingUndefined()), 1);
+assertEq(t1(objectEmulatingUndefined()), 1);
+assertEq(t1(objectEmulatingUndefined()), 1);
+
+function t2(v)
+{
+  if (!v)
+    return 1;
+  return 0;
+}
+
+assertEq(t2(17), 0);
+assertEq(t2(0), 1);
+assertEq(t2(-0), 1);
+assertEq(t2(objectEmulatingUndefined()), 1);
+assertEq(t2(objectEmulatingUndefined()), 1);
+assertEq(t2(objectEmulatingUndefined()), 1);
diff --git a/js/src/jit-test/tests/truthiness/obj-obj-equal.js b/js/src/jit-test/tests/truthiness/obj-obj-equal.js
new file mode 100644
index 000000000..77c6683f1
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/obj-obj-equal.js
@@ -0,0 +1,23 @@
+function f(v1, v2, value)
+{
+  var b = v1 == v2;
+  assertEq(b, value,
+           "failed: " + v1 + ", " + v2 + ": " + value);
+}
+
+var obj = {};
+var emul = objectEmulatingUndefined();
+
+f(obj, obj, true);
+f(obj, obj, true);
+f(emul, obj, false);
+f(emul, obj, false);
+f(obj, emul, false);
+f(obj, emul, false);
+f(Object.prototype, obj, false);
+f(Object.prototype, obj, false);
+f(emul, emul, true);
+f(objectEmulatingUndefined(), emul, false);
+f(objectEmulatingUndefined(), emul, false);
+f(emul, objectEmulatingUndefined(), false);
+f(emul, objectEmulatingUndefined(), false);
diff --git a/js/src/jit-test/tests/truthiness/obj-obj-not-equal.js b/js/src/jit-test/tests/truthiness/obj-obj-not-equal.js
new file mode 100644
index 000000000..f1b2d7c19
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/obj-obj-not-equal.js
@@ -0,0 +1,23 @@
+function f(v1, v2, value)
+{
+  var b = v1 != v2;
+  assertEq(b, value,
+           "failed: " + v1 + ", " + v2 + ": " + value);
+}
+
+var obj = {};
+var emul = objectEmulatingUndefined();
+
+f(obj, obj, false);
+f(obj, obj, false);
+f(emul, obj, true);
+f(emul, obj, true);
+f(obj, emul, true);
+f(obj, emul, true);
+f(Object.prototype, obj, true);
+f(Object.prototype, obj, true);
+f(emul, emul, false);
+f(objectEmulatingUndefined(), emul, true);
+f(objectEmulatingUndefined(), emul, true);
+f(emul, objectEmulatingUndefined(), true);
+f(emul, objectEmulatingUndefined(), true);
diff --git a/js/src/jit-test/tests/truthiness/strict-equal-null.js b/js/src/jit-test/tests/truthiness/strict-equal-null.js
new file mode 100644
index 000000000..00062d16d
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/strict-equal-null.js
@@ -0,0 +1,37 @@
+function f(v, value)
+{
+  var b = v === null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, false);
+f({}, false);
+f(null, true);
+f(null, true);
+f(undefined, false);
+f(undefined, false);
+f(objectEmulatingUndefined(), false);
+f(objectEmulatingUndefined(), false);
+f(Object.prototype, false);
+f(Object.prototype, false);
+
+function g(v, value)
+{
+  var b = v === null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, false);
+g({}, false);
+
+function h(v, value)
+{
+  var b = v === null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), false);
+h(objectEmulatingUndefined(), false);
diff --git a/js/src/jit-test/tests/truthiness/strict-equal-undefined.js b/js/src/jit-test/tests/truthiness/strict-equal-undefined.js
new file mode 100644
index 000000000..2535cd06f
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/strict-equal-undefined.js
@@ -0,0 +1,37 @@
+function f(v, value)
+{
+  var b = v === undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, false);
+f({}, false);
+f(null, false);
+f(null, false);
+f(undefined, true);
+f(undefined, true);
+f(objectEmulatingUndefined(), false);
+f(objectEmulatingUndefined(), false);
+f(Object.prototype, false);
+f(Object.prototype, false);
+
+function g(v, value)
+{
+  var b = v === undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, false);
+g({}, false);
+
+function h(v, value)
+{
+  var b = v === undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), false);
+h(objectEmulatingUndefined(), false);
diff --git a/js/src/jit-test/tests/truthiness/strict-not-equal-null.js b/js/src/jit-test/tests/truthiness/strict-not-equal-null.js
new file mode 100644
index 000000000..9352ae99d
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/strict-not-equal-null.js
@@ -0,0 +1,37 @@
+function f(v, value)
+{
+  var b = v !== null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, true);
+f({}, true);
+f(null, false);
+f(null, false);
+f(undefined, true);
+f(undefined, true);
+f(objectEmulatingUndefined(), true);
+f(objectEmulatingUndefined(), true);
+f(Object.prototype, true);
+f(Object.prototype, true);
+
+function g(v, value)
+{
+  var b = v !== null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, true);
+g({}, true);
+
+function h(v, value)
+{
+  var b = v !== null;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), true);
+h(objectEmulatingUndefined(), true);
diff --git a/js/src/jit-test/tests/truthiness/strict-not-equal-undefined.js b/js/src/jit-test/tests/truthiness/strict-not-equal-undefined.js
new file mode 100644
index 000000000..21790b23e
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/strict-not-equal-undefined.js
@@ -0,0 +1,37 @@
+function f(v, value)
+{
+  var b = v !== undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+f({}, true);
+f({}, true);
+f(null, true);
+f(null, true);
+f(undefined, false);
+f(undefined, false);
+f(objectEmulatingUndefined(), true);
+f(objectEmulatingUndefined(), true);
+f(Object.prototype, true);
+f(Object.prototype, true);
+
+function g(v, value)
+{
+  var b = v !== undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+g({}, true);
+g({}, true);
+
+function h(v, value)
+{
+  var b = v !== undefined;
+  assertEq(b, value,
+           "failed: " + v + " " + value);
+}
+
+h(objectEmulatingUndefined(), true);
+h(objectEmulatingUndefined(), true);
diff --git a/js/src/jit-test/tests/truthiness/typeof.js b/js/src/jit-test/tests/truthiness/typeof.js
new file mode 100644
index 000000000..4b295b318
--- /dev/null
+++ b/js/src/jit-test/tests/truthiness/typeof.js
@@ -0,0 +1,23 @@
+function t1(v)
+{
+  return typeof v;
+}
+
+assertEq(t1(objectEmulatingUndefined()), "undefined");
+assertEq(t1(objectEmulatingUndefined()), "undefined");
+assertEq(t1(objectEmulatingUndefined()), "undefined");
+
+function t2(v)
+{
+  return typeof v;
+}
+
+assertEq(t2(17), "number");
+assertEq(t2(0), "number");
+assertEq(t2(-0), "number");
+assertEq(t2(function(){}), "function");
+assertEq(t2({}), "object");
+assertEq(t2(null), "object");
+assertEq(t2(objectEmulatingUndefined()), "undefined");
+assertEq(t2(objectEmulatingUndefined()), "undefined");
+assertEq(t2(objectEmulatingUndefined()), "undefined");