AMOS parser error

upon sending https://moodle.org/plugins/view.php?plugin=block_sharing_cart to AMOS for parsing, there was below error.

Error: AMOS threw exception mlang_parser_exception: Error: Expected T_CONSTANT_ENCAPSED_STRING array item value at line 4

relevant lang file area below:

$string['pluginname'] = 'Sharing Cart';

$string['sharing_cart'] = $string['pluginname'];

I think we should allow for such lang variable duplication in plugins, author is probaly thinking it might be different in future. Meanwhile, i'll advise author to simply replicate the string.