`match` doesn't rebind `this`

It seems that `match` doesn't do the right thing that `switch` does with `this`:

```
foo:
  match @bar
  | foo => bar
```

compiles to:

```
  foo: (function(){
    var ref$;
    switch (ref$ = [this.bar], false) {
    case !foo(ref$[0]):
      return bar;
    }
  }())
```
