SQL::Translator triggered a subtle piece of wrongness, whereby it

SQL::Translator triggered a subtle piece of wrongness, whereby it
managed to cause a proxy constant subroutine in the symbol table to
be upgraded to a GV at precisely the point where it was being
considered as a possible IO handle name. The core's user-space visible
behaviour certainly was buggy - I believe this patch to be the correct
fix. However, it seems to be very hard to write a test for it.

p4raw-id: //depot/perl@32172