Better user error if User extends a Spec with parameters?

[mwachs5]

If I (erroneously) extend a Spec in this way:

package mytest

class MySpec(foo: Int) extends AnyFunSpec {
...

}

Then invoke scalatest with:
-s mytest.MySpec

I get a RUN ABORTED message, with no other information.

Am I missing some flag that would say something more descriptive like "RUN ABORTED: Couldn't build constructor" or "RUN ABORTED: Scalatest can't pass constructor parameters to something that extends a Spec"?

[cheeseng]

@mwachs5 Sorry for the really late response, but hopefully this open PR shall improve the mentioned problem:

#2269

Cheers.