#436 TRY must be used on single Semaphore

[Rainer Müller]

The grammar of OpenPEARL allows a listOfNames after TRY.
PEARL90 allowed only a single semaphore.

The result value does give any information which semaphore was already in the locked state.

Conclusion:

• The compiler must reject more than one semaphore after TRY.
• The language report allowed already only a single semaphore.