Not really addressing your question but it's a nice idea to label inner
blocks like this:
DECLARE
   x   NUMBER;
BEGIN
   NULL;

   IF x = 1
   THEN
     -- inner pl/sql block begins here
     <<error_trap>>
      BEGIN
         NULL;
      -- inner exception block
      EXCEPTION
         WHEN OTHERS
         THEN
            NULL;
      END error_trap;
   END IF;

   NULL;
EXCEPTION
   WHEN OTHERS
   THEN
      NULL;
END;

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