% perl -MO=Deparse -e 'print abc'
     print abc $_;
% perl -MO=Deparse -e 'print(abc)'
     print abc $_;

# when you said 'indirect object' I thought this was
# what you thought was going on....
% perl -MO=Deparse -e 'print abc def'
     print 'def'->abc;
% perl -MO=Deparse -e 'print(abc def)'
     print 'def'->abc;

% perl -MO=Deparse -e 'open abc; print abc def'
     open abc;
     print abc 'def';
% perl -MO=Deparse -e 'open abc; print(abc def)'
     open abc;
     print abc 'def';

% perl -MO=Deparse -e 'print abc:: def'
     print abc 'def';
% perl -MO=Deparse -e 'print(abc:: def)'
     print abc 'def';

% perl -MO=Deparse -e 'print abc:: ()'
     print abc ();
% perl -MO=Deparse -e 'print(abc:: ())'
     print abc ();

% perl -MO=Deparse -e 'print abc::def ()'
     print abc::def ();
% perl -MO=Deparse -e 'print(abc::def ())'
     print abc::def ();