Avoid using incompatible pointer type for old_warn
#101
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See #98 (comment): Newer compilers may have
-Werror=incompatible-pointer-types
by default.PL_curcop->cop_warnings
previously had typeSV *
, thenSTRLEN *
, and nowchar *
as of Perl 5.37.6. Sinceold_warn
is only used to temporarily hold the value fromPL_curcop->cop_warnings
without dereferencing it,old_warn
can instead be declared asvoid *
regardless of Perl 5 version.