Match types when slurping

I couldn't work out how to match types when slurping with `__`:

```
block = quote
begin
north
east
south
west
end
end
```
Untyped slurping works:
```
symbols = @match block begin
begin
s__
end => s
end
```
but I wanted to match only `Symbols`, so I tried this but didn't work:
```
symbols = @match block begin
begin
s__Symbol
end => s
end
```