Oops, I must have misread it as Perl_warner(aTHX_ "...") when I wrote the reply.

As for packWARN, perl 5.8 uses those while 5.6 didn't, hence you're not seeing them in your 5.6.2 source tree.

In reply to Re^5: How to prevent references from stringifying? by xmath
in thread How to prevent references from stringifying? by diotalevi

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