Rustc does not stop on error.

``` rust
fn main() {
    println!("Hello, world!");
    let
}
```

It outputs

```
src/main.rs:4:1: 4:2 error: unexpected token: `<eof>`
src/main.rs:4 }
              ^
src/main.rs:4:1: 4:2 error: unexpected token: `<eof>`
src/main.rs:4 }
              ^
```

again and again. It does not stop.

```
rustc 1.8.0-nightly (57c357d89 2016-02-16)
```
