It does more than affect precedence 

$ perl -M5.010 -e'sub f { 4,5,6 } say scalar( my $y = f )'
6

$ perl -M5.010 -e'sub f { 4,5,6 } say scalar( my ($y) = f )'
3

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See Re^2: my within brackets above

In reply to Re^2: my within brackets by ikegami
in thread my within brackets by Bod

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