Unintelligible error for statics in pattern position

``` rust
pub static X: uint = 1u;

fn main() {
    match 1u {
        self::X => { },
        _       => { },
    }
}
```

```
test2.rs:5:9: 5:16 error: mismatched types: expected `uint`, found an enum or structure pattern
test2.rs:5         self::X => { },
                   ^~~~~~~
```
