In order for PL/I (and many other languages) to work correctly,
you must not damage the runtime environment they establish. When
interlanguage calls are involved, this means that:
- Any routine that registers an exception handler should deregister
that handler before returning to PL/I.
- Out-of-block GOTOs are permitted only if the source and target
blocks are coded in the same language and any intervening blocks
are coded in the same language.
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