bors[bot] cebb995d21
Merge #3425
3425: Fix a bug for single dollar sign macro r=matklad a=edwin0cheng

This PR fixed a bug to allow the following valid `macro_rules!` :

```rust
macro_rules! m {
    ($) => ($)
}
```

Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>
2020-03-03 17:07:27 +00:00
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