Improve error message for unexpected EOF

[jruderman]

fn x() { }
fn y() {
fn z() { }

Result:

a.rs:3:9:3:10: error: unexpected token: <eof>

Expected: something like of "missing } after function body which begins on line 2".

[emberian]

This has been fixed, kinda:

foo.rs:3:9: 3:10 error: file ended with unbalanced delimiters
foo.rs:3 fn z() { }
                  ^

[emberian]

@catamorphism can this be closed?