Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

163 files changed, 3551 insertions, 0 deletions

diff --git a/js/src/tests/test262/language/block-scope/browser.js b/js/src/tests/test262/language/block-scope/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/browser.js
diff --git a/js/src/tests/test262/language/block-scope/leave/browser.js b/js/src/tests/test262/language/block-scope/leave/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/browser.js
diff --git a/js/src/tests/test262/language/block-scope/leave/finally-block-let-declaration-only-shadows-outer-parameter-value-1.js b/js/src/tests/test262/language/block-scope/leave/finally-block-let-declaration-only-shadows-outer-parameter-value-1.js
new file mode 100644
index 0000000000..71df11fcf4
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/finally-block-let-declaration-only-shadows-outer-parameter-value-1.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    finally block let declaration only shadows outer parameter value 1
+---*/
+try {
+  (function(x) {
+    try {
+      let x = 'inner';
+      throw 0;
+    } finally {
+      assert.sameValue(x, 'outer');
+    }
+  })('outer');
+} catch (e) {}
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/finally-block-let-declaration-only-shadows-outer-parameter-value-2.js b/js/src/tests/test262/language/block-scope/leave/finally-block-let-declaration-only-shadows-outer-parameter-value-2.js
new file mode 100644
index 0000000000..39ddaaca24
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/finally-block-let-declaration-only-shadows-outer-parameter-value-2.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    finally block let declaration only shadows outer parameter value 2
+---*/
+(function(x) {
+  try {
+    let x = 'middle';
+    {
+      let x = 'inner';
+      throw 0;
+    }
+  } catch(e) {
+
+  } finally {
+    assert.sameValue(x, 'outer');
+  }
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/for-loop-block-let-declaration-only-shadows-outer-parameter-value-1.js b/js/src/tests/test262/language/block-scope/leave/for-loop-block-let-declaration-only-shadows-outer-parameter-value-1.js
new file mode 100644
index 0000000000..67982b3ee2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/for-loop-block-let-declaration-only-shadows-outer-parameter-value-1.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    for loop block let declaration only shadows outer parameter value 1
+---*/
+(function(x) {
+  for (var i = 0; i < 10; ++i) {
+    let x = 'inner' + i;
+    continue;
+  }
+  assert.sameValue(x, 'outer');
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/for-loop-block-let-declaration-only-shadows-outer-parameter-value-2.js b/js/src/tests/test262/language/block-scope/leave/for-loop-block-let-declaration-only-shadows-outer-parameter-value-2.js
new file mode 100644
index 0000000000..48af214652
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/for-loop-block-let-declaration-only-shadows-outer-parameter-value-2.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    for loop block let declaration only shadows outer parameter value 2
+---*/
+(function(x) {
+  label: for (var i = 0; i < 10; ++i) {
+    let x = 'middle' + i;
+    for (var j = 0; j < 10; ++j) {
+      let x = 'inner' + j;
+      continue label;
+    }
+  }
+  assert.sameValue(x, 'outer');
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/nested-block-let-declaration-only-shadows-outer-parameter-value-1.js b/js/src/tests/test262/language/block-scope/leave/nested-block-let-declaration-only-shadows-outer-parameter-value-1.js
new file mode 100644
index 0000000000..59dc979b90
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/nested-block-let-declaration-only-shadows-outer-parameter-value-1.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    nested block let declaration only shadows outer parameter value 1
+---*/
+(function(x) {
+  label: {
+    let x = 'inner';
+    break label;
+  }
+  assert.sameValue(x, 'outer');
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/nested-block-let-declaration-only-shadows-outer-parameter-value-2.js b/js/src/tests/test262/language/block-scope/leave/nested-block-let-declaration-only-shadows-outer-parameter-value-2.js
new file mode 100644
index 0000000000..9a1829989a
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/nested-block-let-declaration-only-shadows-outer-parameter-value-2.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    nested block let declaration only shadows outer parameter value 2
+---*/
+(function(x) {
+  label: {
+    let x = 'middle';
+    {
+      let x = 'inner';
+      break label;
+    }
+  }
+  assert.sameValue(x, 'outer');
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/outermost-binding-updated-in-catch-block-nested-block-let-declaration-unseen-outside-of-block.js b/js/src/tests/test262/language/block-scope/leave/outermost-binding-updated-in-catch-block-nested-block-let-declaration-unseen-outside-of-block.js
new file mode 100644
index 0000000000..4a2dd81b07
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/outermost-binding-updated-in-catch-block-nested-block-let-declaration-unseen-outside-of-block.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    outermost binding updated in catch block; nested block let declaration unseen outside of block
+---*/
+var caught = false;
+try {
+  {
+    let xx = 18;
+    throw 25;
+  }
+} catch (e) {
+  caught = true;
+  assert.sameValue(e, 25);
+  (function () {
+    try {
+      // NOTE: This checks that the block scope containing xx has been
+      // removed from the context chain.
+      assert.sameValue(xx, undefined);
+      eval('xx');
+      assert(false);  // should not reach here
+    } catch (e2) {
+      assert(e2 instanceof ReferenceError);
+    }
+  })();
+}
+assert(caught);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/shell.js b/js/src/tests/test262/language/block-scope/leave/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/shell.js
diff --git a/js/src/tests/test262/language/block-scope/leave/try-block-let-declaration-only-shadows-outer-parameter-value-1.js b/js/src/tests/test262/language/block-scope/leave/try-block-let-declaration-only-shadows-outer-parameter-value-1.js
new file mode 100644
index 0000000000..80a14d7677
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/try-block-let-declaration-only-shadows-outer-parameter-value-1.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    try block let declaration only shadows outer parameter value 1
+---*/
+(function(x) {
+  try {
+    let x = 'inner';
+    throw 0;
+  } catch (e) {
+    assert.sameValue(x, 'outer');
+  }
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/try-block-let-declaration-only-shadows-outer-parameter-value-2.js b/js/src/tests/test262/language/block-scope/leave/try-block-let-declaration-only-shadows-outer-parameter-value-2.js
new file mode 100644
index 0000000000..7d0cb8c0f8
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/try-block-let-declaration-only-shadows-outer-parameter-value-2.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    try block let declaration only shadows outer parameter value 2
+---*/
+(function(x) {
+  try {
+    let x = 'middle';
+    {
+      let x = 'inner';
+      throw 0;
+    }
+  } catch (e) {
+    assert.sameValue(x, 'outer');
+  }
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/verify-context-in-finally-block.js b/js/src/tests/test262/language/block-scope/leave/verify-context-in-finally-block.js
new file mode 100644
index 0000000000..5bbfaaf087
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/verify-context-in-finally-block.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    verify context in finally block 1
+---*/
+function f() {}
+
+(function(x) {
+  try {
+    let x = 'inner';
+    throw 0;
+  } catch(e) {
+
+  } finally {
+    f();
+    assert.sameValue(x, 'outer');
+  }
+})('outer');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/verify-context-in-for-loop-block.js b/js/src/tests/test262/language/block-scope/leave/verify-context-in-for-loop-block.js
new file mode 100644
index 0000000000..17590b18cb
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/verify-context-in-for-loop-block.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    verify context in for loop block 2
+---*/
+function f() {}
+
+(function(x) {
+  for (var i = 0; i < 10; ++i) {
+    let x = 'inner';
+    continue;
+  }
+  f();
+  assert.sameValue(x, 'outer');
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/verify-context-in-labelled-block.js b/js/src/tests/test262/language/block-scope/leave/verify-context-in-labelled-block.js
new file mode 100644
index 0000000000..32474daf50
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/verify-context-in-labelled-block.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    verify context in labelled block 1
+---*/
+function f() {}
+
+(function(x) {
+  label: {
+    let x = 'inner';
+    break label;
+  }
+  f();  // The context could be restored from the stack after the call.
+  assert.sameValue(x, 'outer');
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/verify-context-in-try-block.js b/js/src/tests/test262/language/block-scope/leave/verify-context-in-try-block.js
new file mode 100644
index 0000000000..5b458d4a64
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/verify-context-in-try-block.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    verify context in try block 1
+---*/
+function f() {}
+
+(function(x) {
+  try {
+    let x = 'inner';
+    throw 0;
+  } catch (e) {
+    f();
+    assert.sameValue(x, 'outer');
+  }
+})('outer');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/x-after-break-to-label.js b/js/src/tests/test262/language/block-scope/leave/x-after-break-to-label.js
new file mode 100644
index 0000000000..257e2441ac
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/x-after-break-to-label.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    x after break to label
+---*/
+{
+  let x = 2;
+  L: {
+    let x = 3;
+    assert.sameValue(x, 3);
+    break L;
+    assert(false);
+  }
+  assert.sameValue(x, 2);
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/leave/x-before-continue.js b/js/src/tests/test262/language/block-scope/leave/x-before-continue.js
new file mode 100644
index 0000000000..b8114ec475
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/leave/x-before-continue.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    x before continue
+---*/
+do {
+  let x = 4;
+  assert.sameValue(x, 4);
+  {
+    let x = 5;
+    assert.sameValue(x, 5);
+    continue;
+    assert(false);
+  }
+} while (false);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/return-from/block-const.js b/js/src/tests/test262/language/block-scope/return-from/block-const.js
new file mode 100644
index 0000000000..d9b77b768b
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/return-from/block-const.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    return from block
+---*/
+function fn() {
+  const u = 3;
+  {
+    const v = 6;
+    return u + v;
+  }
+}
+assert.sameValue(fn(), 9);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/return-from/block-let.js b/js/src/tests/test262/language/block-scope/return-from/block-let.js
new file mode 100644
index 0000000000..736d829d8b
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/return-from/block-let.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    return from block
+---*/
+function fn() {
+  let x = 3;
+  {
+    let y = 6;
+    return x + y;
+  }
+}
+assert.sameValue(fn(), 9);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/return-from/browser.js b/js/src/tests/test262/language/block-scope/return-from/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/return-from/browser.js
diff --git a/js/src/tests/test262/language/block-scope/return-from/shell.js b/js/src/tests/test262/language/block-scope/return-from/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/return-from/shell.js
diff --git a/js/src/tests/test262/language/block-scope/shadowing/browser.js b/js/src/tests/test262/language/block-scope/shadowing/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/browser.js
diff --git a/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-catch-parameter.js b/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-catch-parameter.js
new file mode 100644
index 0000000000..77bfd22f4a
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-catch-parameter.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    catch parameter shadowing catch parameter
+---*/
+function fn() {
+  var c = 1;
+  try {
+    throw 'stuff3';
+  } catch (c) {
+    try {
+      throw 'stuff4';
+    } catch(c) {
+      assert.sameValue(c,'stuff4');
+      // catch parameter shadowing catch parameter
+      c = 3;
+      assert.sameValue(c, 3);
+    }
+    assert.sameValue(c, 'stuff3');
+  }
+  assert.sameValue(c, 1);
+}
+fn(1);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-function-parameter-name.js b/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-function-parameter-name.js
new file mode 100644
index 0000000000..30f54026fa
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-function-parameter-name.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    catch parameter shadowing function parameter name
+---*/
+function fn(a) {
+  try {
+    throw 'stuff1';
+  } catch (a) {
+    assert.sameValue(a, 'stuff1');
+    // catch parameter shadowing function parameter name
+    a = 2;
+    assert.sameValue(a, 2);
+  }
+}
+fn(1);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-let-declaration.js b/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-let-declaration.js
new file mode 100644
index 0000000000..215fcf758b
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-let-declaration.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    catch parameter shadowing let declaration
+---*/
+{
+  let a = 3;
+  try {
+    throw 'stuff2';
+  } catch (a) {
+    assert.sameValue(a, 'stuff2');
+    // catch parameter shadowing let declaration
+    a = 4;
+    assert.sameValue(a, 4);
+  }
+  assert.sameValue(a, 3);
+}
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-var-variable.js b/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-var-variable.js
new file mode 100644
index 0000000000..f12b667704
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/catch-parameter-shadowing-var-variable.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    catch parameter shadowing var variable
+---*/
+function fn() {
+  var a = 1;
+  try {
+    throw 'stuff3';
+  } catch (a) {
+    // catch parameter shadowing var variable
+    assert.sameValue(a, 'stuff3');
+  }
+  assert.sameValue(a, 1);
+}
+fn();
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/const-declaration-shadowing-catch-parameter.js b/js/src/tests/test262/language/block-scope/shadowing/const-declaration-shadowing-catch-parameter.js
new file mode 100644
index 0000000000..963ed3302e
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/const-declaration-shadowing-catch-parameter.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    const declaration shadowing catch parameter
+---*/
+function fn() {
+  var a = 1;
+  try {
+    throw 'stuff3';
+  } catch (a) {
+    {
+      // const declaration shadowing catch parameter
+      const a = 3;
+      assert.sameValue(a, 3);
+    }
+    assert.sameValue(a, 'stuff3');
+  }
+  assert.sameValue(a, 1);
+}
+fn();
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/const-declarations-shadowing-parameter-name-let-const-and-var-variables.js b/js/src/tests/test262/language/block-scope/shadowing/const-declarations-shadowing-parameter-name-let-const-and-var-variables.js
new file mode 100644
index 0000000000..fa31e802cb
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/const-declarations-shadowing-parameter-name-let-const-and-var-variables.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    const declarations shadowing parameter name, let, const and var variables
+---*/
+function fn(a) {
+  let b = 1;
+  var c = 1;
+  const d = 1;
+  {
+    const a = 2;
+    const b = 2;
+    const c = 2;
+    const d = 2;
+    assert.sameValue(a, 2);
+    assert.sameValue(b, 2);
+    assert.sameValue(c, 2);
+    assert.sameValue(d, 2);
+  }
+
+  assert.sameValue(a, 1);
+  assert.sameValue(b, 1);
+  assert.sameValue(c, 1);
+  assert.sameValue(d, 1);
+}
+fn(1);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/dynamic-lookup-from-closure.js b/js/src/tests/test262/language/block-scope/shadowing/dynamic-lookup-from-closure.js
new file mode 100644
index 0000000000..0f69d01cfe
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/dynamic-lookup-from-closure.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    dynamic lookup from closure
+---*/
+function fn(one) {
+  var x = one + 1;
+  let y = one + 2;
+  const u = one + 4;
+  {
+    let z = one + 3;
+    const v = one + 5;
+    function f() {
+      assert.sameValue(one, 1);
+      assert.sameValue(x, 2);
+      assert.sameValue(y, 3);
+      assert.sameValue(z, 4);
+      assert.sameValue(u, 5);
+      assert.sameValue(v, 6);
+    }
+
+    f();
+  }
+}
+fn(1);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/dynamic-lookup-in-and-through-block-contexts.js b/js/src/tests/test262/language/block-scope/shadowing/dynamic-lookup-in-and-through-block-contexts.js
new file mode 100644
index 0000000000..038e71b55b
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/dynamic-lookup-in-and-through-block-contexts.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    dynamic lookup in and through block contexts
+---*/
+function fn(one) {
+  var x = one + 1;
+  let y = one + 2;
+  const u = one + 4;
+  {
+    let z = one + 3;
+    const v = one + 5;
+    assert.sameValue(one, 1);
+    assert.sameValue(x, 2);
+    assert.sameValue(y, 3);
+    assert.sameValue(z, 4);
+    assert.sameValue(u, 5);
+    assert.sameValue(v, 6);
+  }
+}
+
+fn(1);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/hoisting-var-declarations-out-of-blocks.js b/js/src/tests/test262/language/block-scope/shadowing/hoisting-var-declarations-out-of-blocks.js
new file mode 100644
index 0000000000..de270a9f74
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/hoisting-var-declarations-out-of-blocks.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    hoisting var declarations out of blocks
+---*/
+function fn() {
+  {
+    var x = 1;
+    var y;
+  }
+  assert.sameValue(x, 1);
+  assert.sameValue(y, undefined);
+}
+fn();
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/let-declaration-shadowing-catch-parameter.js b/js/src/tests/test262/language/block-scope/shadowing/let-declaration-shadowing-catch-parameter.js
new file mode 100644
index 0000000000..cbe153281f
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/let-declaration-shadowing-catch-parameter.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    let declaration shadowing catch parameter
+---*/
+try {
+  throw 'stuff1';
+} catch (a) {
+  {
+    // let declaration shadowing catch parameter
+    let a = 3;
+    assert.sameValue(a, 3);
+  }
+  assert.sameValue(a, 'stuff1');
+}
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/let-declarations-shadowing-parameter-name-let-const-and-var.js b/js/src/tests/test262/language/block-scope/shadowing/let-declarations-shadowing-parameter-name-let-const-and-var.js
new file mode 100644
index 0000000000..3f1a781bf8
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/let-declarations-shadowing-parameter-name-let-const-and-var.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    let declarations shadowing parameter name, let, const and var
+---*/
+function fn(a) {
+  let b = 1;
+  var c = 1;
+  const d = 1;
+  {
+    let a = 2;
+    let b = 2;
+    let c = 2;
+    let d = 2;
+    assert.sameValue(a, 2);
+    assert.sameValue(b, 2);
+    assert.sameValue(c, 2);
+    assert.sameValue(d, 2);
+  }
+}
+fn(1);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/lookup-from-closure.js b/js/src/tests/test262/language/block-scope/shadowing/lookup-from-closure.js
new file mode 100644
index 0000000000..38139e812c
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/lookup-from-closure.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    lookup from closure
+---*/
+function f5(one) {
+  var x = one + 1;
+  let y = one + 2;
+  const u = one + 4;
+  {
+    let z = one + 3;
+    const v = one + 5;
+    function f() {
+      assert.sameValue(one, 1);
+      assert.sameValue(x, 2);
+      assert.sameValue(y, 3);
+      assert.sameValue(z, 4);
+      assert.sameValue(u, 5);
+      assert.sameValue(v, 6);
+    }
+
+    f();
+  }
+}
+f5(1);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/lookup-in-and-through-block-contexts.js b/js/src/tests/test262/language/block-scope/shadowing/lookup-in-and-through-block-contexts.js
new file mode 100644
index 0000000000..3700de243d
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/lookup-in-and-through-block-contexts.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    lookup in and through block contexts
+---*/
+function fn(one) {
+  var x = one + 1;
+  let y = one + 2;
+  const u = one + 4;
+  {
+    let z = one + 3;
+    const v = one + 5;
+    assert.sameValue(one, 1);
+    assert.sameValue(x, 2);
+    assert.sameValue(y, 3);
+    assert.sameValue(z, 4);
+    assert.sameValue(u, 5);
+    assert.sameValue(v, 6);
+  }
+}
+
+fn(1);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/parameter-name-shadowing-catch-parameter.js b/js/src/tests/test262/language/block-scope/shadowing/parameter-name-shadowing-catch-parameter.js
new file mode 100644
index 0000000000..1ec2063cee
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/parameter-name-shadowing-catch-parameter.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    parameter name shadowing catch parameter
+---*/
+function fn() {
+  var c = 1;
+  try {
+    throw 'stuff3';
+  } catch (c) {
+    (function(c) {
+      // parameter name shadowing catch parameter
+      c = 3;
+      assert.sameValue(c, 3);
+    })();
+    assert.sameValue(c, 'stuff3');
+  }
+  assert.sameValue(c, 1);
+}
+fn();
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/parameter-name-shadowing-parameter-name-let-const-and-var.js b/js/src/tests/test262/language/block-scope/shadowing/parameter-name-shadowing-parameter-name-let-const-and-var.js
new file mode 100644
index 0000000000..e8194ce346
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/parameter-name-shadowing-parameter-name-let-const-and-var.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    parameter name shadowing parameter name, let, const and var
+---*/
+function fn(a) {
+  let b = 1;
+  var c = 1;
+  const d = 1;
+
+  (function(a, b, c, d) {
+    a = 2;
+    b = 2;
+    c = 2;
+    d = 2;
+
+    assert.sameValue(a, 2);
+    assert.sameValue(b, 2);
+    assert.sameValue(c, 2);
+    assert.sameValue(d, 2);
+  })(1, 1);
+
+  assert.sameValue(a, 1);
+  assert.sameValue(b, 1);
+  assert.sameValue(c, 1);
+  assert.sameValue(d, 1);
+}
+
+fn(1);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/shadowing/shell.js b/js/src/tests/test262/language/block-scope/shadowing/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shadowing/shell.js
diff --git a/js/src/tests/test262/language/block-scope/shell.js b/js/src/tests/test262/language/block-scope/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/shell.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/browser.js b/js/src/tests/test262/language/block-scope/syntax/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/browser.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/acquire-properties-from-array.js b/js/src/tests/test262/language/block-scope/syntax/for-in/acquire-properties-from-array.js
new file mode 100644
index 0000000000..66a0be39dd
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/acquire-properties-from-array.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    for-in to acquire properties from array
+---*/
+function props(x) {
+  var array = [];
+  for (let p in x) array.push(p);
+  return array;
+}
+var subject;
+
+subject = props([]);
+assert.sameValue(subject.length, 0, "[]: length");
+assert.sameValue(subject[0], undefined, "[]: first property");
+assert.sameValue(subject[1], undefined, "[]: second property");
+assert.sameValue(subject[2], undefined, "[]: third property");
+assert.sameValue(subject[3], undefined, "[]: fourth property");
+
+subject = props([1]);
+assert.sameValue(subject.length, 1, "[1]: length");
+assert.sameValue(subject[0], "0", "[1]: first property");
+assert.sameValue(subject[1], undefined, "[1]: second property");
+assert.sameValue(subject[2], undefined, "[1]: third property");
+assert.sameValue(subject[3], undefined, "[1]: fourth property");
+
+subject = props([1, 2]);
+assert.sameValue(subject.length, 2, "[1, 2]: length");
+assert.sameValue(subject[0], "0", "[1, 2]: first property");
+assert.sameValue(subject[1], "1", "[1, 2]: second property");
+assert.sameValue(subject[2], undefined, "[1, 2]: third property");
+assert.sameValue(subject[3], undefined, "[1, 2]: fourth property");
+
+subject = props([1, 2, 3]);
+assert.sameValue(subject.length, 3, "[1, 2, 3]: length");
+assert.sameValue(subject[0], "0", "[1, 2, 3]: first property");
+assert.sameValue(subject[1], "1", "[1, 2, 3]: second property");
+assert.sameValue(subject[2], "2", "[1, 2, 3]: third property");
+assert.sameValue(subject[3], undefined, "[1, 2, 3]: fourth property");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/acquire-properties-from-object.js b/js/src/tests/test262/language/block-scope/syntax/for-in/acquire-properties-from-object.js
new file mode 100644
index 0000000000..9016fb3b1d
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/acquire-properties-from-object.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    for-in to acquire properties from object
+---*/
+function props(x) {
+  var array = [];
+  for (let p in x) array.push(p);
+  return array;
+}
+var subject;
+
+subject = props({});
+assert.sameValue(subject.length, 0, "{}: length");
+assert.sameValue(subject[0], undefined, "{}: first property");
+assert.sameValue(subject[1], undefined, "{}: second property");
+assert.sameValue(subject[2], undefined, "{}: third property");
+assert.sameValue(subject[3], undefined, "{}: fourth property");
+
+subject = props({x:1});
+assert.sameValue(subject.length, 1, "{x:1}: length");
+assert.sameValue(subject[0], "x", "{x:1}: first property");
+assert.sameValue(subject[1], undefined, "{x:1}: second property");
+assert.sameValue(subject[2], undefined, "{x:1}: third property");
+assert.sameValue(subject[3], undefined, "{x:1}: fourth property");
+
+subject = props({x:1, y:2});
+assert.sameValue(subject.length, 2, "{x:1, y:2}: length");
+assert.sameValue(subject[0], "x", "{x:1, y:2}: first property");
+assert.sameValue(subject[1], "y", "{x:1, y:2}: second property");
+assert.sameValue(subject[2], undefined, "{x:1, y:2}: third property");
+assert.sameValue(subject[3], undefined, "{x:1, y:2}: fourth property");
+
+subject = props({x:1, y:2, zoom:3});
+assert.sameValue(subject.length, 3, "{x:1, y:2, zoom:3}: length");
+assert.sameValue(subject[0], "x", "{x:1, y:2, zoom:3}: first property");
+assert.sameValue(subject[1], "y", "{x:1, y:2, zoom:3}: second property");
+assert.sameValue(subject[2], "zoom", "{x:1, y:2, zoom:3}: third property");
+assert.sameValue(subject[3], undefined, "{x:1, y:2, zoom:3}: fourth property");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/browser.js b/js/src/tests/test262/language/block-scope/syntax/for-in/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/browser.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-initialization-assignment.js b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-initialization-assignment.js
new file mode 100644
index 0000000000..6eb679df1e
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-initialization-assignment.js
@@ -0,0 +1,16 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    for declaration:
+    disallow initialization assignment
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+for (let x = 3 in {}) { }
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings-with-and-without-initializer.js b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings-with-and-without-initializer.js
new file mode 100644
index 0000000000..67383a0210
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings-with-and-without-initializer.js
@@ -0,0 +1,16 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    for declaration:
+    disallow multiple lexical bindings, with and without initializer
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+for (let x = 3, y in {}) { }
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings-with-initializer.js b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings-with-initializer.js
new file mode 100644
index 0000000000..36c2e9c22a
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings-with-initializer.js
@@ -0,0 +1,16 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    for declaration:
+    disallow multiple lexical bindings, with initializer
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+for (let x = 3, y = 4 in {}) { }
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings-without-and-with-initializer.js b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings-without-and-with-initializer.js
new file mode 100644
index 0000000000..84f9c83688
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings-without-and-with-initializer.js
@@ -0,0 +1,16 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    for declaration:
+    disallow multiple lexical bindings, without and with initializer
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+for (let x, y = 4 in {}) { }
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings.js b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings.js
new file mode 100644
index 0000000000..550974ced8
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/disallow-multiple-lexical-bindings.js
@@ -0,0 +1,16 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    for declaration:
+    disallow multiple lexical bindings
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+for (let x, y in {}) { }
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/mixed-values-in-iteration.js b/js/src/tests/test262/language/block-scope/syntax/for-in/mixed-values-in-iteration.js
new file mode 100644
index 0000000000..85f2c0bf4e
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/mixed-values-in-iteration.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    Mixed values in iteration
+---*/
+function fn(x) {
+  let a = [];
+  for (let p in x) {
+    a.push(function () { return p; });
+  }
+  let k = 0;
+  for (let q in x) {
+    assert.sameValue(q, a[k]());
+    ++k;
+  }
+}
+fn({a : [0], b : 1, c : {v : 1}, get d() {}, set e(x) {}});
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/for-in/shell.js b/js/src/tests/test262/language/block-scope/syntax/for-in/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/for-in/shell.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/function-declarations/browser.js b/js/src/tests/test262/language/block-scope/syntax/function-declarations/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/function-declarations/browser.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-case-expression-statement-list.js b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-case-expression-statement-list.js
new file mode 100644
index 0000000000..0d4a759993
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-case-expression-statement-list.js
@@ -0,0 +1,12 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    function declarations in statement position in strict mode:
+    case Expression : StatementList
+---*/
+switch (true) { case true: function g() {} }
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-default-statement-list.js b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-default-statement-list.js
new file mode 100644
index 0000000000..cb656254c0
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-default-statement-list.js
@@ -0,0 +1,12 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    function declarations in statement position in strict mode:
+    default : StatementList
+---*/
+switch (true) { default: function g() {} }
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-do-statement-while-expression.js b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-do-statement-while-expression.js
new file mode 100644
index 0000000000..7e21f7ff75
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-do-statement-while-expression.js
@@ -0,0 +1,16 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    function declarations in statement position:
+    do Statement while ( Expression )
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+do function g() {} while (false)
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-for-statement.js b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-for-statement.js
new file mode 100644
index 0000000000..f69e43ff18
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-for-statement.js
@@ -0,0 +1,16 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    function declarations in statement position:
+    for ( ;;) Statement
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+for (;false;) function g() {}
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-if-expression-statement-else-statement-strict.js b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-if-expression-statement-else-statement-strict.js
new file mode 100644
index 0000000000..548fffc8fb
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-if-expression-statement-else-statement-strict.js
@@ -0,0 +1,18 @@
+// |reftest| error:SyntaxError
+'use strict';
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    function declarations in statement position in strict mode:
+    if ( Expression ) Statement else Statement
+negative:
+  phase: parse
+  type: SyntaxError
+flags: [onlyStrict]
+---*/
+
+$DONOTEVALUATE();
+if (true) {} else function g() {}
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-if-expression-statement-strict.js b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-if-expression-statement-strict.js
new file mode 100644
index 0000000000..63d057e96d
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-if-expression-statement-strict.js
@@ -0,0 +1,18 @@
+// |reftest| error:SyntaxError
+'use strict';
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    function declarations in statement position in strict mode:
+    if ( Expression ) Statement
+negative:
+  phase: parse
+  type: SyntaxError
+flags: [onlyStrict]
+---*/
+
+$DONOTEVALUATE();
+if (true) function g() {}
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-while-expression-statement.js b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-while-expression-statement.js
new file mode 100644
index 0000000000..69063f05f3
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/function-declarations/in-statement-position-while-expression-statement.js
@@ -0,0 +1,16 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    function declarations in statement position:
+    while ( Expression ) Statement
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+while (false) function g() {}
+
diff --git a/js/src/tests/test262/language/block-scope/syntax/function-declarations/shell.js b/js/src/tests/test262/language/block-scope/syntax/function-declarations/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/function-declarations/shell.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/allowed-to-declare-function-with-function-declaration.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/allowed-to-declare-function-with-function-declaration.js
new file mode 100644
index 0000000000..a690fce961
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/allowed-to-declare-function-with-function-declaration.js
@@ -0,0 +1,12 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    redeclaration outermost:
+    allowed to declare function with function declaration
+---*/
+function f() {}
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/allowed-to-redeclare-function-declaration-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/allowed-to-redeclare-function-declaration-with-var.js
new file mode 100644
index 0000000000..0a935e2eed
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/allowed-to-redeclare-function-declaration-with-var.js
@@ -0,0 +1,12 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    redeclaration outermost:
+    allowed to redeclare function declaration with var
+---*/
+function f() {} var f;
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/allowed-to-redeclare-var-with-function-declaration.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/allowed-to-redeclare-var-with-function-declaration.js
new file mode 100644
index 0000000000..84dc183b7f
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/allowed-to-redeclare-var-with-function-declaration.js
@@ -0,0 +1,12 @@
+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    redeclaration outermost:
+    allowed to redeclare var with function declaration
+---*/
+var f; function f() {}
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/browser.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/browser.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/shell.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration-global/shell.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..30e9060835
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-function-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (AsyncFunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {} async function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..f0090c5c2c
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-function-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (AsyncFunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration, async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {} async function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..fd0003513b
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-function-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (AsyncFunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {} class f {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..2d2da8c965
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-function-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (AsyncFunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {} const f = 0 }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-function.js
new file mode 100644
index 0000000000..63838a6d0d
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-async-function-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (AsyncFunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {} function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..7c6ddaf799
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-function-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (AsyncFunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators, async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {} function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..60bf796a9c
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-function-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (AsyncFunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {} let f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..df21e890e6
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-function-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/block-attempt-to-redeclare-async-function-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (AsyncFunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {} var f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..3c23f35b63
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-generator-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (AsyncGeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions, async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {} async function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..a5a05f0cef
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-generator-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (AsyncGeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {} async function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..762c243df1
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-generator-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (AsyncGeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {} class f {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..3063589f2c
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-generator-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (AsyncGeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {} const f = 0 }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-function.js
new file mode 100644
index 0000000000..fe967de833
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-async-generator-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (AsyncGeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {} function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..4309c5c10d
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-generator-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (AsyncGeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators, async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {} function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..8704f96a24
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-async-generator-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (AsyncGeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {} let f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..50011a54f4
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/async-generator-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/block-attempt-to-redeclare-async-generator-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (AsyncGeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {} var f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/browser.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/browser.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..af383c677c
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-class-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (ClassDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {} async function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..89127b7a0e
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-class-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (ClassDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {} async function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..d7750c679d
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-class-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (ClassDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {} class f {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..2a170d5ba9
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-class-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (ClassDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {} const f = 0 }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-function.js
new file mode 100644
index 0000000000..6d18ab875d
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-function.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-class-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (ClassDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {} function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..8707b6397e
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-class-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (ClassDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {} function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..0d497ceada
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-class-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (ClassDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {} let f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..bff3e380a6
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/class-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/block-attempt-to-redeclare-class-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (ClassDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {} var f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..be6f6d7470
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-const-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (LexicalDeclaration (const) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; async function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..72c84df655
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-const-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (LexicalDeclaration (const) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; async function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..9bfda25bfc
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-const-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (LexicalDeclaration (const) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; class f {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..7735c597b1
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-const-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (LexicalDeclaration (const) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; const f = 0 }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-function.js
new file mode 100644
index 0000000000..6bf53adcdc
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-function.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-const-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (LexicalDeclaration (const) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..68a8db29c8
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-const-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (LexicalDeclaration (const) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..d531c94df7
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-const-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (LexicalDeclaration (const) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; let f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..ffd66089ae
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/const-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/block-attempt-to-redeclare-const-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (LexicalDeclaration (const) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; var f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..5ce0b8096f
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,26 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/fn-block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (VariableDeclaration in BlockStatement inside a function)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+function x() {
+  { async function f() {}; var f; }
+}
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..13a398f6fe
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,26 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/fn-block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (VariableDeclaration in BlockStatement inside a function)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+function x() {
+  { async function* f() {}; var f; }
+}
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..3504d76bfb
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,25 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/fn-block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (VariableDeclaration in BlockStatement inside a function)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+function x() {
+  { class f {}; var f; }
+}
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..b6fc7ff7bc
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,25 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/fn-block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (VariableDeclaration in BlockStatement inside a function)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+function x() {
+  { const f = 0; var f; }
+}
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-function.js
new file mode 100644
index 0000000000..00d1a1427d
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-function.js
@@ -0,0 +1,25 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/fn-block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (VariableDeclaration in BlockStatement inside a function)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+function x() {
+  { function f() {}; var f; }
+}
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..54e206c3aa
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,26 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/fn-block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (VariableDeclaration in BlockStatement inside a function)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+function x() {
+  { function* f() {}; var f; }
+}
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..f75f2d3d92
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,25 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/fn-block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (VariableDeclaration in BlockStatement inside a function)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+function x() {
+  { let f; var f; }
+}
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..2ad1fd58eb
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/fn-scope-var-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,20 @@
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/fn-block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (VariableDeclaration in BlockStatement inside a function)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+---*/
+
+
+function x() {
+  { var f; var f }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-declaration-attempt-to-redeclare-with-var-declaration-nested-in-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-declaration-attempt-to-redeclare-with-var-declaration-nested-in-function.js
new file mode 100644
index 0000000000..3c72d3aeb1
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-declaration-attempt-to-redeclare-with-var-declaration-nested-in-function.js
@@ -0,0 +1,32 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2018 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-block-static-semantics-early-errors
+description: >
+  Redeclaration with VariableDeclaration (FunctionDeclaration in BlockStatement)
+info: |
+  13.2.1 Static Semantics: Early Errors
+
+  It is a Syntax Error if any element of the LexicallyDeclaredNames of
+  StatementList also occurs in the VarDeclaredNames of StatementList.
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+function g() {
+    // Create an outer block-statement.
+    {
+        // A lexically declared function declaration.
+        function f() {}
+
+        // An inner block-statement with a variable-declared name.
+        {
+            var f;
+        }
+    }
+}
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..e96e49fcb5
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-function-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (FunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {} async function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..ffd109e6d0
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-function-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (FunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {} async function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..6bdeb6dceb
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-function-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (FunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {} class f {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..6f0622cf5a
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-function-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (FunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {} const f = 0 }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-function-strict.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-function-strict.js
new file mode 100644
index 0000000000..de89b4b02b
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-function-strict.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+'use strict';
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-function-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (FunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated, onlyStrict]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {} function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..e1fe7d8417
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-function-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (FunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {} function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..793027ea79
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-function-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (FunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {} let f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..a6b0fdc033
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/function-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/block-attempt-to-redeclare-function-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (FunctionDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {} var f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..602f2e33a4
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-generator-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (GeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions, generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {} async function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..c73e8355d4
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-generator-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (GeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration, generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {} async function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..a3f3322da9
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-generator-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (GeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {} class f {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..6e918b52a8
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-generator-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (GeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {} const f = 0 }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-function.js
new file mode 100644
index 0000000000..12495cfc56
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-generator-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (GeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {} function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..72597b350c
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-generator-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (GeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {} function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..3099228f20
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-generator-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (GeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {} let f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..57b9ad552f
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/generator-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/block-attempt-to-redeclare-generator-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (GeneratorDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {} var f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..9251a7886e
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,40 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ { var f; } async function f() {}; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..38a095ef55
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,40 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ { var f; } async function* f() {}; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..8d31296d14
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,39 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ { var f; } class f {}; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..a3023384ad
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,39 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ { var f; } const f = 0; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-function.js
new file mode 100644
index 0000000000..8bcb39e45e
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-function.js
@@ -0,0 +1,39 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-inner-block-var-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ { var f; } function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..e20a966469
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,40 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ { var f; } function* f() {}; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..85b7fe4059
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,39 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ { var f; } let f; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..2920168bc9
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,34 @@
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/block-attempt-to-redeclare-inner-block-var-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+---*/
+
+
+{ { var f; } var f }
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-async-function.js
new file mode 100644
index 0000000000..136d49a177
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-async-function.js
@@ -0,0 +1,40 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration-after.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {}; { var f; } }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-async-generator.js
new file mode 100644
index 0000000000..df37d53238
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-async-generator.js
@@ -0,0 +1,40 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration-after.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {}; { var f; } }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-class.js
new file mode 100644
index 0000000000..33de9aeb71
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-class.js
@@ -0,0 +1,39 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration-after.template
+/*---
+description: redeclaration with ClassDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {}; { var f; } }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-const.js
new file mode 100644
index 0000000000..5c9984bd42
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-const.js
@@ -0,0 +1,39 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration-after.template
+/*---
+description: redeclaration with const-LexicalDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; { var f; } }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-function.js
new file mode 100644
index 0000000000..e66637fcab
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-function.js
@@ -0,0 +1,39 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-inner-block-var-declaration-after.template
+/*---
+description: redeclaration with FunctionDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {} { var f; } }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-generator.js
new file mode 100644
index 0000000000..0ea32cdcca
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-generator.js
@@ -0,0 +1,40 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration-after.template
+/*---
+description: redeclaration with GeneratorDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {}; { var f; } }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-let.js
new file mode 100644
index 0000000000..42e8ad738f
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/inner-block-var-redeclaration-attempt-after-let.js
@@ -0,0 +1,39 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-inner-block-var-declaration-after.template
+/*---
+description: redeclaration with let-LexicalDeclaration (VariableDeclaration in a BlockStatement inside a BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+    Static Semantics: VarDeclaredNames
+
+    Block : { }
+
+    1. Return a new empty List.
+
+    StatementList : StatementList StatementListItem
+
+    1. Let names be VarDeclaredNames of StatementList.
+    2. Append to names the elements of the VarDeclaredNames of StatementListItem.
+    3. Return names.
+
+    StatementListItem : Declaration
+
+    1. Return a new empty List.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; { var f; } }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..fb96dc7bb1
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-let-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (LexicalDeclaration (let) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; async function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..a995140cdd
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-let-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (LexicalDeclaration (let) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; async function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..135a5bed29
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-let-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (LexicalDeclaration (let) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; class f {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..892a392c97
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-let-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (LexicalDeclaration (let) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; const f = 0 }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-function.js
new file mode 100644
index 0000000000..333ad27641
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-function.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-let-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (LexicalDeclaration (let) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..04edfcad88
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-let-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (LexicalDeclaration (let) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..b5fca41af8
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-let-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (LexicalDeclaration (let) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if the LexicallyDeclaredNames of StatementList contains
+    any duplicate entries.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; let f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..6392dbe7e3
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/let-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/block-attempt-to-redeclare-let-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (LexicalDeclaration (let) in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; var f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/shell.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/shell.js
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-async-function.js
new file mode 100644
index 0000000000..eb00396e65
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-async-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ var f; async function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-async-generator.js
new file mode 100644
index 0000000000..6dab6dafdd
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-async-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ var f; async function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-class.js
new file mode 100644
index 0000000000..654bd6b30c
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-class.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with ClassDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ var f; class f {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-const.js
new file mode 100644
index 0000000000..60bbde7e91
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-const.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with const-LexicalDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ var f; const f = 0 }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-function.js
new file mode 100644
index 0000000000..71354827e1
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-function.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with FunctionDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ var f; function f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-generator.js
new file mode 100644
index 0000000000..9646700107
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with GeneratorDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ var f; function* f() {} }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-let.js
new file mode 100644
index 0000000000..210531fa16
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-let.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with let-LexicalDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ var f; let f }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-var.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-var.js
new file mode 100644
index 0000000000..d020ff2b3d
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-name-redeclaration-attempt-with-var.js
@@ -0,0 +1,18 @@
+// This file was procedurally generated from the following sources:
+// - src/declarations/var.case
+// - src/declarations/redeclare-allow-var/block-attempt-to-redeclare-var-declaration.template
+/*---
+description: redeclaration with VariableDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+---*/
+
+
+{ var f; var f }
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-async-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-async-function.js
new file mode 100644
index 0000000000..e109c7ef21
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-async-function.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-function.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration-after.template
+/*---
+description: redeclaration with AsyncFunctionDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-functions]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function f() {}; var f; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-async-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-async-generator.js
new file mode 100644
index 0000000000..44dd1f42b5
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-async-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/async-generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration-after.template
+/*---
+description: redeclaration with AsyncGeneratorDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [async-iteration]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ async function* f() {}; var f; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-class.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-class.js
new file mode 100644
index 0000000000..73545ef577
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-class.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/class.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration-after.template
+/*---
+description: redeclaration with ClassDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ class f {}; var f; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-const.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-const.js
new file mode 100644
index 0000000000..79a377240e
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-const.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/const.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration-after.template
+/*---
+description: redeclaration with const-LexicalDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ const f = 0; var f; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-function.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-function.js
new file mode 100644
index 0000000000..ea49a0be89
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-function.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/function.case
+// - src/declarations/redeclare-allow-sloppy-function/block-attempt-to-redeclare-var-declaration-after.template
+/*---
+description: redeclaration with FunctionDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function f() {}; var f; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-generator.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-generator.js
new file mode 100644
index 0000000000..3a9d0015a1
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-generator.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/generator.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration-after.template
+/*---
+description: redeclaration with GeneratorDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+features: [generators]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ function* f() {}; var f; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-let.js b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-let.js
new file mode 100644
index 0000000000..a8b415ff28
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/redeclaration/var-redeclaration-attempt-after-let.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/declarations/let.case
+// - src/declarations/redeclare/block-attempt-to-redeclare-var-declaration-after.template
+/*---
+description: redeclaration with let-LexicalDeclaration (VariableDeclaration in BlockStatement)
+esid: sec-block-static-semantics-early-errors
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    Block : { StatementList }
+
+    It is a Syntax Error if any element of the LexicallyDeclaredNames of
+    StatementList also occurs in the VarDeclaredNames of StatementList.
+
+---*/
+
+
+$DONOTEVALUATE();
+
+{ let f; var f; }
diff --git a/js/src/tests/test262/language/block-scope/syntax/shell.js b/js/src/tests/test262/language/block-scope/syntax/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/block-scope/syntax/shell.js