I think you're right! 
lanx:/tmp$ perl -MO=Deparse,-p,-q -e 'print "${X()} ${X()}\n"'
print((((${X();} . ' ') . ${X();}) . "\n"));
    
lanx:/tmp$ perl -MO=Deparse,-p,-q -e 'print "${X()}${X()}\n"'
print(((${X();} . ${X();}) . "\n"));

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Cheers Rolf

In reply to Re^2: Order of evaluation/interpolation of references (alias vs copy) by LanX
in thread Order of evaluation/interpolation of references by Anonymous Monk

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