Use .. to identify autoscoped constructors

[JaroslavTulach]

Pull Request Description

Fixes #9275.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• All code follows the
  Scala,
  Java,
  style guides.
• All code has been tested:
  • Unit tests have been written where possible.

[hubertp]

Not to start language wars but... it's easy to write ... or .. by accident. Maybe something like ?Just instead of ..Just would work better?

[JaroslavTulach]

Not to start language wars but...

The syntax discussion is the right place to express such opinions.

[JaroslavTulach]

@jdunkerley, you wanted me to test:

from Standard.Base import all

main =
    a = 5
    a..7

which yields Method .. of type Integer could not be found. error.