Why can't I use a Javascript function before its definition inside a try block?

As discussed here, function definitions can be used before they're defined. But as soon as a section of code is wrapped in a try block, this ceases to be the case.

This displays "Hello world":

hello();
function hello() { alert("Hello world"); }

But this displays "ReferenceError: hello is not defined":

try {
  hello();
  function hello() { alert("Hello world"); }
} catch (err) {
  alert(err);
}

So there is clearly something "special" about a try block with respect to function declarations. Is there any way to get around this behavior?