Odd local variable behaviour when defined in var x=y=null; format within main()

[waynecd]

I would expect both x and y to be declared as local variables but y is declared as a global variable.
From what I've read both x and y should be local variables available only within the function they are declared in.
If "var x,y;" format is used they are declared as local variables as expected.

Just curious if anyone has any insight about this.

debugClear();
function preMain(){
    setPriceStudy(true);
}

function main(){
    var x=y=null;
    var a,b;
    x=1;
    y=2;
    a=3;
    b=4;
    testIt();
}
function testIt(){
    //debugPrintln("13: x: "+x);//returns undefined variable error as expected
    debugPrintln("14: y: "+y);//returns "14: y: 2"
    //I would expect an undefined variable error for y also
    //debugPrintln("17: a: "+a);//returns undefined variable error as expected
    //debugPrintln("17: b: "+b);//returns undefined variable error as expected
} 

Wayne

[waynecd]

Turns out that it is not odd at all, just poor syntax.

the correct syntax is:

//

var x=null, y=null;