jscript: Fixed list literal length calculation.

dlls/jscript/parser.y

@@ -738,7 +738,8 @@ PrimaryExpression
 
 /* ECMA-262 3rd Edition    11.1.4 */
 ArrayLiteral
-        : '[' Elision_opt ']'   { $$ = new_array_literal_expression(ctx, NULL, $2); }
+        : '[' ']'               { $$ = new_array_literal_expression(ctx, NULL, 0); }
+        | '[' Elision_opt ']'   { $$ = new_array_literal_expression(ctx, NULL, $2+1); }
         | '[' ElementList ']'   { $$ = new_array_literal_expression(ctx, $2, 0); }
         | '[' ElementList ',' Elision_opt ']'
                                 { $$ = new_array_literal_expression(ctx, $2, $4+1); }

dlls/jscript/tests/lang.js

@@ -615,6 +615,9 @@ ok(tmp["6"] === true, "tmp[6] !== true");
 ok(tmp[2] === 1, "tmp[2] !== 1");
 
 ok([1,].length === 2, "[1,].length !== 2");
+ok([,,].length === 3, "[,,].length !== 3");
+ok([,].length === 2, "[].length != 2");
+ok([].length === 0, "[].length != 0");
 
 tmp = 0;
 while(tmp < 4) {