1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/parser/for-each-warn.js b/js/src/jit-test/tests/parser/for-each-warn.js
new file mode 100644
index 000000000..2b20c6174
--- /dev/null
+++ b/js/src/jit-test/tests/parser/for-each-warn.js
@@ -0,0 +1,36 @@
+// for-each should be warned once and only once.
+
+function testWarn(code) {
+  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();
+}
+
+testWarn("for each (var x in {}) {}");
+testWarn("for each (x in {}) {}");
+testWarn("for each (let y in {}) {}");
+testWarn("for each (const y in {}) {}");
+testWarn("for each ([x, y] in {}) {}");