Can't name identifier the "flip table" emoticon.

```
fn _╯°□°╯︵┻━┻() {}
```

errors with:

```
table.rs:3:3: 3:4 error: unknown start of token: 9583
table.rs:3 fn _╯°□°╯︵┻━┻() {}
              ^
```

However, I put an underscore before the unicode, so "9583" shouldn't even be considered the start of the token. Note that the span is wrong too.
