Where I immediately run into the limitations of PHP

boris_repl_ughhhhhh.txt

[1] boris> require 'vendor/autoload.php';
[2] boris> use Respect\Validation\Validator as v;
PHP Parse error:  syntax error, unexpected 'use' (T_USE) in /Users/coj/bin/boris/lib/Boris/EvalWorker.php(103) : eval()'d code on line 1
PHP Stack trace:
PHP   1. {main}() /Users/coj/bin/boris/bin/boris:0
PHP   2. Boris\Boris->start() /Users/coj/bin/boris/bin/boris:9
PHP   3. Boris\EvalWorker->start() /Users/coj/bin/boris/lib/Boris/Boris.php:95

Parse error: syntax error, unexpected 'use' (T_USE) in /Users/coj/bin/boris/lib/Boris/EvalWorker.php(103) : eval()'d code on line 1

Call Stack:
    0.0012     229784   1. {main}() /Users/coj/bin/boris/bin/boris:0
    0.0024     264216   2. Boris\Boris->start() /Users/coj/bin/boris/bin/boris:9
    0.0046     304704   3. Boris\EvalWorker->start() /Users/coj/bin/boris/lib/Boris/Boris.php:95

 → bool(false)
[3] boris>

The problem here being that I can't do something basic in this REPL program because PHP just won't let me.