[perl #40218] [BUG] - get_*_global opcodes throw exceptions

[Matt Diephouse]

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So sayeth the docs for the get_*_hll global opcodes:

If the global doesn't exist, $1 is set to null.

However, the current implementation throws an exception if the global
doesn't exist instead of returning null. It was decided in
#parrotsketch on 15 Aug 2006 that returning null is the right thing
to do.

This is a fairly substantial change, requiring changes to tests and
compilers.

--
Matt Diephouse