Clash of class file names with characters translation

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Compiler must check for class name clashes with respect to characters translation.

Code like the following should not be compiled:

class ::: // compiles to $$colon$$colon$$colon.class

class :: {
  class colon // compiles to $$colon$$colon$$colon.class
}

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Imported From: https://issues.scala-lang.org/browse/SI-3075?orig=1
Reporter: Pavel Fatin (pavel.fatin)

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@paulp said:
Duplicate of #2806.

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Pavel Fatin (pavel.fatin) said:
The proposal is to prohibit erroneous compilation while Ticket #2806 is not solved.

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@paulp said:
Replying to [comment:2 Pavel.Fatin]:

The proposal is to prohibit erroneous compilation while Ticket #2806 is not solved.

Don't reopen tickets after I close them. I'm by far the most likely person to fix this and if you go out of your way to antagonize me I will be happy to never fix it. This is an exact duplicate of 2806, which I opened, and your proposal of "fail" is not sufficiently earth-shaking to justify adding yet more noise to the trac database.

And the fact that "2806 is not solved" is what makes this a duplicate.