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From: Tim Bunce on 5 Mar 2010 10:26
I encountered a core dump running PL/Perl installcheck with a very
recent git HEAD of PostgreSQL and a not quite so recent git HEAD of perl.

The cause is a subtle difference between SvTYPE(sv) == SVt_RV and
SvROK(sv). The former is checking a low-level implementation detail
while the later is directly checking "does this sv contains a reference".

The attached patch fixes the problem by changing the SvTYPE check to use
SvROK instead. Although I only tripped over one case, the patch changes
all four uses of SvTYPE(sv) == SVt_RV. The remaining uses of SvTYPE are ok.

Tim.

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