Bug 1102131 - Part 4: Log console warnings for deprecated let blocks. r=shu

js/src/frontend/Parser.cpp

@@ -3660,7 +3660,10 @@ Parser<ParseHandler>::letBlock(LetContext letContext)
         if (!expr)
             return null();
         MUST_MATCH_TOKEN(TOK_RC, JSMSG_CURLY_AFTER_LET);
+
         sawDeprecatedLetBlock = true;
+        if (!report(ParseWarning, pc->sc->strict, expr, JSMSG_DEPRECATED_LET_BLOCK))
+            return null();
     } else {
         MOZ_ASSERT(letContext == LetExpression);
         expr = assignExpr();

js/src/js.msg

@@ -226,6 +226,7 @@ MSG_DEF(JSMSG_CURLY_IN_COMPOUND,       0, JSEXN_SYNTAXERR, "missing } in compoun
 MSG_DEF(JSMSG_DECLARATION_AFTER_EXPORT,0, JSEXN_SYNTAXERR, "missing declaration after 'export' keyword")
 MSG_DEF(JSMSG_DECLARATION_AFTER_IMPORT,0, JSEXN_SYNTAXERR, "missing declaration after 'import' keyword")
 MSG_DEF(JSMSG_DEPRECATED_DELETE_OPERAND, 0, JSEXN_SYNTAXERR, "applying the 'delete' operator to an unqualified name is deprecated")
+MSG_DEF(JSMSG_DEPRECATED_LET_BLOCK,      0, JSEXN_NONE, "JavaScript 1.7's let blocks are deprecated")
 MSG_DEF(JSMSG_DEPRECATED_LET_EXPRESSION, 0, JSEXN_NONE, "JavaScript 1.7's let expressions are deprecated")
 MSG_DEF(JSMSG_DEPRECATED_OCTAL,        0, JSEXN_SYNTAXERR, "octal literals and octal escape sequences are deprecated")
 MSG_DEF(JSMSG_DEPRECATED_PRAGMA,       1, JSEXN_NONE, "Using //@ to indicate {0} pragmas is deprecated. Use //# instead")

js/src/vm/Xdr.h

@@ -34,7 +34,7 @@ namespace js {
  * Nightly) and without (all others).  FIXME: Bug 1066322 - Enable ES6 symbols
  * in all builds.
  */
-static const uint32_t XDR_BYTECODE_VERSION_SUBTRAHEND = 218;
+static const uint32_t XDR_BYTECODE_VERSION_SUBTRAHEND = 220;
 static_assert(XDR_BYTECODE_VERSION_SUBTRAHEND % 2 == 0, "see the comment above");
 static const uint32_t XDR_BYTECODE_VERSION =
     uint32_t(0xb973c0de - (XDR_BYTECODE_VERSION_SUBTRAHEND