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use strict;
use warnings;
...
{                   no feature 'say'; sub f {eval 1 for 0 .. 999}}
{use feature 'say'; no feature 'say'; sub g {eval 1 for 0 .. 999}}

   Rate    d    b    e    g    f    a    c
d 119/s   --  -0% -18% -23% -25% -53% -53%
...
a 252/s 112% 112%  74%  62%  59%   --  -0%
c 252/s 112% 112%  74%  63%  59%   0%   --