Add m-esr52 at 52.6.0

1 files changed, 18 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/parser/bug-888002-3.js b/js/src/jit-test/tests/parser/bug-888002-3.js
new file mode 100644
index 000000000..964ae2e1b
--- /dev/null
+++ b/js/src/jit-test/tests/parser/bug-888002-3.js
@@ -0,0 +1,18 @@
+// Constant folding doesn't affect strict delete either.
+// In particular, it doesn't affect whether |delete x| is a strict error.
+
+load(libdir + "asserts.js");
+
+(function (x) {
+    "use strict";
+
+    // These senseless delete-expressions are legal even in strict mode.
+    // Per ES5.1 11.4.1 step 2, each one does nothing and returns true.
+    assertEq(delete (1 ? x : x), true);
+    assertEq(delete (0 || x), true);
+    assertEq(delete (1 && x), true);
+
+    // Plain `delete x` is a SyntaxError though.
+    assertThrowsInstanceOf(() => eval('delete x'), SyntaxError);
+    assertThrowsInstanceOf(() => Function('"use strict"; delete x'), SyntaxError);
+}());