Add warning about calling sv_setsv on temp SVs

diff --git a/pod/perlguts.pod b/pod/perlguts.pod
index 5e8f077..07509bc 100644 (file)
--- a/pod/perlguts.pod
+++ b/pod/perlguts.pod
@@ -2008,6 +2008,9 @@ Note that C<sv_setref_pv> copies the pointer while this copies the string.
 =item sv_setsv
 
 Copies the contents of the source SV C<ssv> into the destination SV C<dsv>.
+(B<NOTE:> If C<ssv> has the C<SVs_TEMP> bit set, C<sv_setsv> may simply steal
+the string from C<ssv> and give it to C<dsv>, leaving C<ssv> empty.
+Caveat caller.)
 
        void    sv_setsv _((SV* dsv, SV* ssv));