Function declaration in CoffeeScript

I notice that in CoffeeScript, if I define a function using:

a = (c) -> c=1

I can only get the function expression:

var a;
a = function(c) {
    return c = 1;
};

But, personally I often use function declaration,for example:

function a(c) {
    return c = 1;
}

I do use the first form, but I'm wondering if there is a way in CoffeeScript generating a function declaration. If there is no such way, I would like to know why CoffeeScript avoid doing this. I don't think JSLint would holler an error for declaration, as long as the function is declared at the top of the scope.