need a compiler warning

[wildfiction]

In the code below:

function preMain() {
    _init = true;
}

var _init = true;

function main() {
    if(_init) {
        // If sym is renamed sym1 then we hit the final debug()
        // function at the bottom
        var sym = getSymbol().split(" ");
        if(sym[0] != "ES") {
            debugPrintln("symbol is ES");
        }
        else {
            debugPrintln("symbol is not ES");
        }
        
        _init = false;
    }
    
    debugPrintln("before test function");
    var ff = close(0, sym("nq #f"));
    debugPrintln("after test function");
} 

the final print statement isn't hit because sym() blows up because I've used a var called sym ealier on.

Not sure if this is intended functionality or not. If it is intended functionality then it would be useful if the pre-compiler or syntax checker could make sure that certain keywords weren't used in a context which they shouldn't be used such as here. Or perhaps generate a meaningful message to help track down such erroneous coding.