Replace custom placeholder in Validation message (Laravel)

validator.php

<?php

// When I create a validation rule, I can set my one replacer which helps replace different special placeholders
// For example if validator message is "Problem with :some", then my replacer will handle it
Validator::extend('testrule', function($attribute, $value, $parameters, $validator) {

    $validator->addReplacer('testrule', function($message, $attribute, $rule, $parameters){
        return str_replace(":some", "whatever", $message);
    });

    return $value == "test";
});

What about passing the value to the message. Instead of
return str_replace(":some", "whatever", $message);
I want to do something like:
return str_replace(":some", $someValue , $message);

Any ideas?
Thanks