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% perl -wle 'sub foo { 1 for @_ } print 2 if defined foo()' % perl -wle 'sub foo { 1 for @_ } print 2 if defined foo(3)' ... 2 % perl -wle 'sub foo { 1 for @_ } print 2 if foo(3) eq ""' 2
% perl -wle 'sub foo { 43 for @_ } print 2 if defined foo()' Useless use of a constant in void context at -e line 1.
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