I think that what you want is eval BLOCK but all this is a little vague.

You would do something like:

   eval
   {
      # do something that might raise a fatal error
   };

    if ( $@ )
    {
       # do something to report the error
       # $@ contains the error message or error object
    }
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However it might be useful if you gave us a bit more of a clue as to what it was you were trying to do.

/J\