1 files changed, 24 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..3012e4bfe9
--- /dev/null
+++ b/js/src/tests/non262/PrivateName/illegal-in-class-context.js
@@ -0,0 +1,24 @@
+// |reftest| skip-if(!xulRuntime.shell)
+
+// Are private fields enabled?
+let privateFields = false;
+try {
+  Function('class C { #x; }');
+  privateFields = true;
+} catch (exc) {
+  assertEq(exc instanceof SyntaxError, true);
+}
+
+if (!privateFields) {
+  assertThrowsInstanceOf(() => eval(`class A { #x }`), SyntaxError);
+  assertThrowsInstanceOf(() => eval(`class A { #x=10 }`), SyntaxError);
+} else {
+  assertThrowsInstanceOf(() => eval(`class A { #x; #x; }`), SyntaxError);
+}
+
+// No computed private fields
+assertThrowsInstanceOf(
+    () => eval(`var x = "foo"; class A { #[x] = 20; }`), SyntaxError);
+
+
+if (typeof reportCompare === 'function') reportCompare(0, 0);