I was reading through the documentation, and it looks like "mixin" should be a keyword, but it is not listed on the keywords page.

http://www.angelcode.com/angelscript/sdk/docs/manual/doc_script_mixin.html

http://www.angelcode.com/angelscript/sdk/docs/manual/doc_reserved_keywords.html

You're right. I've forgotten to update the list of reserved keywords in the documentation. I'll have it updated for the next release.

Thanks for pointing it out.