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sub r  { $_[0] } # no-op?
sub rr :lvalue { $_[0] } # no-op?
...

$_ = 1;
print rr(++$_) + rr(++$_)++;

use v5.16;
no v5.17;
...

$_ = 1;
say ++rr(++$_) + ++rr(r(rr(++$_)++));