mark_safe and ValidationError params

[Andrew Pinkham]

I'm currently running Django 1.7.4. Provided the following clean function on a 
form:

    def clean_slug(self):
        new_slug = self.cleaned_data['slug'].lower()
        if new_slug == 'invalid_value':
            raise ValidationError(
                # _ is ugettext 
                mark_safe(_('SlugField may not be '
                          '"%(slug_value)s" '
                          'for URL reasons.')),
                params={
                    'slug_value':
                        mark_safe('<code>invalid_value</code>')})
        return new_slug


I expect the HTML error output to read:

    <li>SlugField may not be &quot<code>create_list</code>&quot; for URL 
reasons.</li>

Instead, the HTML output is: 

    <li>SlugField may not be &quot;&lt;code&gt;create_list&lt;/code&gt;&quot; 
for URL reasons.</li>

Meaning, the user sees the <code> tags as opposed to having them output as HTML.

The problem occurs when I remove the call to ugettext as well, and while I 
expect to only need to apply mark_safe to the value in params, I apply the 
function to all of the text above.

Am I doing something silly? How do I properly apply mark_safe to text passed to 
params of exceptions? What is the best-practice here?

Thanks,
Andrew

PS
I promise to add a code to my ValidationError before committing.

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