1 files changed, 78 insertions, 0 deletions
diff --git a/js/src/tests/non262/lexical-environment/block-scoped-functions-deprecated-redecl.js b/js/src/tests/non262/lexical-environment/block-scoped-functions-deprecated-redecl.js
new file mode 100644
index 0000000000..af32be5d3d
--- /dev/null
+++ b/js/src/tests/non262/lexical-environment/block-scoped-functions-deprecated-redecl.js
@@ -0,0 +1,78 @@
+{
+  assertEq(f(), 4);
+  function f() { return 3; }
+  assertEq(f(), 4);
+  function f() { return 4; }
+  assertEq(f(), 4);
+}
+
+// Annex B still works.
+assertEq(f(), 4);
+
+// The same thing with labels.
+{
+  assertEq(f(), 4);
+  function f() { return 3; }
+  assertEq(f(), 4);
+  l: function f() { return 4; }
+  assertEq(f(), 4);
+}
+
+// Annex B still works.
+assertEq(f(), 4);
+
+function test() {
+  {
+    assertEq(f(), 2);
+    function f() { return 1; }
+    assertEq(f(), 2);
+    function f() { return 2; }
+    assertEq(f(), 2);
+  }
+
+  // Annex B still works.
+  assertEq(f(), 2);
+}
+
+test();
+
+var log = '';
+
+try {
+  // Strict mode still cannot redeclare.
+  eval(`"use strict";
+  {
+    function f() { }
+    function f() { }
+  }`);
+} catch (e) {
+  assertEq(e instanceof SyntaxError, true);
+  log += 'e';
+}
+
+try {
+  // Redeclaring an explicitly 'let'-declared binding doesn't work.
+  eval(`{
+    let x = 42;
+    function x() {}
+  }`);
+} catch (e) {
+  assertEq(e instanceof SyntaxError, true);
+  log += 'e';
+}
+
+try {
+  // Redeclaring an explicitly 'const'-declared binding doesn't work.
+  eval(`{
+    const x = 42;
+    function x() {}
+  }`);
+} catch (e) {
+  assertEq(e instanceof SyntaxError, true);
+  log += 'e';
+}
+
+assertEq(log, 'eee');
+
+if ('reportCompare' in this)
+  reportCompare(true, true);