Got it! Using ->can() wrapped in eval{} does the trick nicely: 
package Util::Stuff::abc;
sub attrib1 { 1  }
sub attrib2 { 10 }
...

eval {
if ($symref->can('attrib1')) {
   ... $symref->attrib1 is OK ...
}};

[download]
Thanks to GrandFather and moritz.

In reply to Re^2: Testing package membership by FreakyGreenLeaky
in thread Testing package membership by FreakyGreenLeaky

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