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sub w(&$){&{$_[1]}while&{$_[0]}}sub d(&){$_[0]}
# then, instead of while (foo) { bar },
w{foo}d{bar};

sub l(&){{&{$_[0]};redo}}sub w{$_[0]||last}
# then, instead of while (foo) { bar },
l{w foo;bar};