1 files changed, 63 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/parser/expr-closure-warn.js b/js/src/jit-test/tests/parser/expr-closure-warn.js
new file mode 100644
index 000000000..faadd8eb6
--- /dev/null
+++ b/js/src/jit-test/tests/parser/expr-closure-warn.js
@@ -0,0 +1,63 @@
+// Expression closure should be warned once and only once.
+
+var release_or_beta = getBuildConfiguration().release_or_beta;
+
+function testWarn(code) {
+  if (release_or_beta) {
+    // Warning for expression closure is non-release-only (not Release/Beta).
+    testPass(code);
+    return;
+  }
+
+  enableLastWarning();
+  var g = newGlobal();
+  g.code = code;
+  g.eval('eval(code)');
+  var warning = getLastWarning();
+  assertEq(warning !== null, true, "warning should be caught for " + code);
+  assertEq(warning.name, "Warning");
+
+  clearLastWarning();
+  g.eval('eval(code)');
+  warning = getLastWarning();
+  assertEq(warning, null, "warning should not be caught for 2nd ocurrence");
+
+  clearLastWarning();
+  g = newGlobal();
+  g.code = code;
+  g.eval('Reflect.parse(code);');
+  warning = getLastWarning();
+  assertEq(warning !== null, true, "warning should be caught for " + code);
+  assertEq(warning.name, "Warning");
+
+  clearLastWarning();
+  g.eval('Reflect.parse(code);');
+  warning = getLastWarning();
+  assertEq(warning, null, "warning should not be caught for 2nd ocurrence");
+  disableLastWarning();
+}
+
+function testPass(code) {
+  enableLastWarning();
+  var g = newGlobal();
+  g.code = code;
+  g.eval('eval(code)');
+  var warning = getLastWarning();
+  assertEq(warning, null, "warning should not be caught for " + code);
+
+  clearLastWarning();
+  g = newGlobal();
+  g.code = code;
+  g.eval('Reflect.parse(code);');
+  warning = getLastWarning();
+  assertEq(warning, null, "warning should not be caught for " + code);
+  disableLastWarning();
+}
+
+testWarn("function f() 1");
+testWarn("(function() 1)");
+testWarn("({ get x() 1 })");
+testWarn("({ set x(v) 1 })");
+
+testPass("function f() { 1 }");
+testPass("() => 1");