Comments within type parameters break highlighting

I'm not sure how exactly to fix this, but having an inline block comment that happens to be in a type parameter seems to break the syntax highlighting.

I'm converting some code, whereby I'm removing a type parameter. I've simply commented out the specific type parameter, but the comment is not highlighted correctly.

Normal one line block comments are fine:

```
def foo(x: Int) = { /* this works */ 5 }
```

But the following breaks:

```
def foo[S,/*F[_]:Foldable,*/ A](x: Int) = 5
```

I've narrowed it down to the `[` which changes the pattern, causing the highlight to not work.

Start by reproducing the two Scala snippets in Atom's language-highlighting grammar and compare the behavior of a block comment inside and outside type parameters. Trace the pattern affected by `[` and verify that the commented type parameter no longer disrupts highlighting while ordinary block comments still work.

Written by the indexing model from the issue text.