When looking at precedence issues, the -p (full parens) Deparse option is helpful. 
> perl -MO=Deparse,-p -e 'my($yes2) = defined $bad and -f $bad;'
((my($yes2) = defined($bad)) and (-f $bad));

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In reply to Re^2: Surprising Precedence/Context by Anonymous Monk
in thread Surprising Precedence/Context by williams

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