1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/tests/non262/PrivateName/illegal-in-class-context.js b/js/src/tests/non262/PrivateName/illegal-in-class-context.js
new file mode 100644
index 0000000000..85b34563ec
--- /dev/null
+++ b/js/src/tests/non262/PrivateName/illegal-in-class-context.js
@@ -0,0 +1,32 @@
+// |reftest| skip-if(!xulRuntime.shell)
+
+assertThrowsInstanceOf(() => eval(`class A { #x; #x; }`), SyntaxError);
+
+// No computed private fields
+assertThrowsInstanceOf(
+    () => eval(`var x = "foo"; class A { #[x] = 20; }`), SyntaxError);
+
+function assertThrowsWithMessage(f, msg) {
+    var fullmsg;
+    try {
+        f();
+    } catch (exc) {
+        if (exc.message.normalize() === msg.normalize())
+            return;
+
+        fullmsg = `Assertion failed: expected message '${msg}', got '${exc.message}'`;
+    }
+
+    if (fullmsg === undefined)
+        fullmsg = `Assertion failed: expected exception, no exception thrown`;
+
+    throw new Error(fullmsg);
+}
+
+assertThrowsWithMessage(() => eval(`class A { #x; h(o) { return !#x; }}`),
+    "invalid use of private name in unary expression without object reference");
+assertThrowsWithMessage(() => eval(`class A { #x; h(o) { return 1 + #x in o; }}`),
+    "invalid use of private name due to operator precedence");
+
+
+if (typeof reportCompare === 'function') reportCompare(0, 0);