Include function arguments in the demo as declared variables and update acorn

[PlNG]

Just a tweak to the example.

ast.traverseTopDown(
    'VarDecl(x)',
    function(b) {
        declared[b.x.value] = true;
    },
    'VarDeclInit(x, _)',
    function(b) {
        declared[b.x.value] = true;
    },
    'FArg(x)',
    function(b) {
        declared[b.x.value] = true;
    },
    'Var(x)',
    function(b) {
        if (!declared[b.x.value]) {
            log("Variable " + b.x.value + " is not declared.");
        }
    }
);

And requesting that acorn be updated (with a link to the commit that you're modifying somewhere before modification to make it easier to track down just what changes you're doing for future updates). Acorn now handles ECMA 3-6 where 0.4.1 didn't.

Great program, looking forward to working on it.

[lennartcl]

Thanks for the feedback @PlNG. We are working on integrating a newer Acorn. Feel free to file a pull request with demo improvements.