Fixed unparenthesized comma-sequences in for(;;) variable initializer expressions...

Fixed unparenthesized comma-sequences in for(;;) variable initializer expressions inside blocks.

E. g.

    (ps (lambda (y)
          (for ((x (let ((x0 (foo y)))
                     (bar x0))))
               () ()
            (xyzzy x))))

was producing

    (function (y) {
        var x0;
        for (var x = x0 = foo(y), bar(x0); ; ) {
            xyzzy(x);
        };
    });

A JavaScript parser would then treat the comma as the separator in
VariableDeclarationListNoIn production, so bar(x0) would be occuring
in the position of an Identifier, which is a syntax error (see
ECMA-262 ed. 5.1, ss. 12.6.3, 12.2).