public function justEcho($value = null)
    {
        is_null($value) and $value = '';
        $fqn = ltrim($this->function_name->fullyQualifiedName(), '\\');

        $this->assertPrintable($value, 'provided to justEcho');

        \Patchwork\redefine($fqn, function () use ($value) {
            echo $value;
        });

        $this->assertRedefined($fqn);
    }