[parser] Lift template literal invalid escape restriction

test/mjsunit/harmony/template-escapes.js

Index: test/mjsunit/harmony/template-escapes.js
diff --git a/test/mjsunit/harmony/template-escapes.js b/test/mjsunit/harmony/template-escapes.js
new file mode 100644
index 0000000000000000000000000000000000000000..fcaf8ac5bfcfa79e361852c144cca13139317959
--- /dev/null
+++ b/test/mjsunit/harmony/template-escapes.js
@@ -0,0 +1,785 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-template-escapes
+
+function check({cooked, raw, exprs}) {
+  return function(strs, ...args) {
+    assertArrayEquals(cooked, strs);
+    assertArrayEquals(raw, strs.raw);
+    assertArrayEquals(exprs, args);
+  };
+}
+
+// clang-format off
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\01'
+  ],
+  'exprs': []
+})`\01`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\01',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\01${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\01'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\01`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\01',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\01${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\1'
+  ],
+  'exprs': []
+})`\1`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\1',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\1${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\1'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\1`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\1',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\1${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\xg'
+  ],
+  'exprs': []
+})`\xg`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\xg',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\xg${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\xg'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\xg`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\xg',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\xg${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\xAg'
+  ],
+  'exprs': []
+})`\xAg`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\xAg',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\xAg${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\xAg'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\xAg`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\xAg',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\xAg${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u0'
+  ],
+  'exprs': []
+})`\u0`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u0',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u0${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u0'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u0`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u0',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u0${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u0g'
+  ],
+  'exprs': []
+})`\u0g`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u0g',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u0g${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u0g'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u0g`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u0g',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u0g${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u00g'
+  ],
+  'exprs': []
+})`\u00g`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u00g',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u00g${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u00g'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u00g`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u00g',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u00g${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u000g'
+  ],
+  'exprs': []
+})`\u000g`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u000g',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u000g${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u000g'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u000g`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u000g',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u000g${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u{}'
+  ],
+  'exprs': []
+})`\u{}`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u{}',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u{}${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u{}'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u{}`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u{}',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u{}${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u{-0}'
+  ],
+  'exprs': []
+})`\u{-0}`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u{-0}',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u{-0}${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u{-0}'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u{-0}`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u{-0}',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u{-0}${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u{g}'
+  ],
+  'exprs': []
+})`\u{g}`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u{g}',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u{g}${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u{g}'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u{g}`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u{g}',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u{g}${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u{0'
+  ],
+  'exprs': []
+})`\u{0`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u{0',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u{0${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u{0'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u{0`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u{0',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u{0${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u{\\u{0}'
+  ],
+  'exprs': []
+})`\u{\u{0}`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u{\\u{0}',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u{\u{0}${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u{\\u{0}'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u{\u{0}`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u{\\u{0}',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u{\u{0}${1}right`;
+
+check({
+  'cooked': [
+    undefined
+  ],
+  'raw': [
+    '\\u{110000}'
+  ],
+  'exprs': []
+})`\u{110000}`;
+
+check({
+  'cooked': [
+    undefined,
+    'right'
+  ],
+  'raw': [
+    '\\u{110000}',
+    'right'
+  ],
+  'exprs': [
+    0
+  ]
+})`\u{110000}${0}right`;
+
+check({
+  'cooked': [
+    'left',
+    undefined
+  ],
+  'raw': [
+    'left',
+    '\\u{110000}'
+  ],
+  'exprs': [
+    0
+  ]
+})`left${0}\u{110000}`;
+
+check({
+  'cooked': [
+    'left',
+    undefined,
+    'right'
+  ],
+  'raw': [
+    'left',
+    '\\u{110000}',
+    'right'
+  ],
+  'exprs': [
+    0,
+    1
+  ]
+})`left${0}\u{110000}${1}right`;