class parameter wrongly treated as soft keyword 'inline'

Example from dotr built from master:
```scala
scala> class C(x: String)
// defined class C

scala> class C(inline: String)
1 |class C(inline: String)
  |              ^
  |              an identifier expected, but ':' found
```

inline as I understand is soft keyword only allowed in inlined methods, here it should be treated as normal identifier?
