Prohibit let in lexical bindings

test/test262/test262.status

 # Copyright 2011 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
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 #     * Redistributions of source code must retain the above copyright
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@@ skipping 111 matching lines @@
   'language/block-scope/syntax/redeclaration-in-block/attempt-to-redeclare-var-with-function-declaration': [PASS, FAIL_SLOPPY],
   'language/statements/let/block-local-closure-set-before-initialization': [PASS, FAIL_SLOPPY],
 
   # https://code.google.com/p/v8/issues/detail?id=4405
   'language/block-scope/leave/outermost-binding-updated-in-catch-block-nested-block-let-declaration-unseen-outside-of-block': [PASS, FAIL],
 
   # https://code.google.com/p/v8/issues/detail?id=3305
   # This times out in sloppy mode because sloppy const assignment does not throw.
   'language/statements/const/syntax/const-invalid-assignment-next-expression-for': [PASS, FAIL, TIMEOUT],
 
-  # https://code.google.com/p/v8/issues/detail?id=4403
-  'language/statements/let/syntax/identifier-let-disallowed-as-boundname': [PASS, FAIL_SLOPPY],
-
   # Number/Boolean.prototype is a plain object in ES6
   # https://code.google.com/p/v8/issues/detail?id=4001
   'built-ins/Boolean/prototype/S15.6.3.1_A1': [FAIL],
   'built-ins/Boolean/prototype/S15.6.4_A1': [FAIL],
   'built-ins/Boolean/prototype/toString/S15.6.4.2_A1_T1': [FAIL],
   'built-ins/Boolean/prototype/toString/S15.6.4.2_A1_T2': [FAIL],
   'built-ins/Boolean/prototype/valueOf/S15.6.4.3_A1_T1': [FAIL],
   'built-ins/Boolean/prototype/valueOf/S15.6.4.3_A1_T2': [FAIL],
   'built-ins/Number/15.7.4-1': [FAIL],
   'built-ins/Number/prototype/S15.7.3.1_A2_*': [FAIL],
@@ skipping 616 matching lines @@
 
   # BUG(3251225): Tests that timeout with --nocrankshaft.
   'built-ins/decodeURI/S15.1.3.1_A2.4_T1': [SKIP],
   'built-ins/decodeURI/S15.1.3.1_A2.5_T1': [SKIP],
   'built-ins/decodeURIComponent/S15.1.3.2_A2.4_T1': [SKIP],
   'built-ins/decodeURIComponent/S15.1.3.2_A2.5_T1': [SKIP],
   'built-ins/encodeURI/S15.1.3.3_A2.3_T1': [SKIP],
   'built-ins/encodeURIComponent/S15.1.3.4_A2.3_T1': [SKIP],
 }],  # 'arch == arm or arch == mipsel or arch == mips or arch == arm64'
 ]