[ExpressionLanguage] Add linter #16323
Description
In our project there is possibility write own custom rules. And currently no way check if this rules written correctly. Currently we are using workaround for it, but I think that should be linter.
$error = '';
set_error_handler(function($errno, $errstr) use (&$error) {
$error = $errstr;
});
$expressionLanguage->compile($extendedPattern, array('title'));
restore_error_handler();
if ($error) {
$errorElement
->with('categoryExtended.extendedPattern')
->addViolation($error)
->end();
}