I got an error

the "alias" directive must use captures inside location given by regular expression in /etc/nginx/sites-enabled/default:70

Quite a confusing message for me. The line in question.

alias /home/$homedir/public_html/;

which comes from

# For requests starting with a tilde, break them into three components: # 1. The username, everything after the tilde up to the first slash # 2. The file location, everything after the username up to the last slash # 3. The trailing slash(es) # Then, rewrite to go to the f~/ branch. location /~ {     if ($request_uri ~ ^/~([^/]*)(/.*[^/]|)(/*)$) {         set $homedir $1;         set $filedir $2;         set $trailingslashes $3;         rewrite ^/~([^/]*)(/|$)(.*)$ f~/$3;     } }

# Here, the user-directory components have been parsed. Use an alias to set # the file directory prefix. But if the file at the requested URI is a # directory, we jump to the ~/ branch for additional processing. location f~/ {     alias /home/$homedir/public_html/;     if (-d /home/$homedir/public_html$filedir) {         rewrite ^f~/(.*) ~/$1;     } }

# Here, the request is for a directory in a user's home directory. We check # that the request URI contained trailing slashes. If it did not, then we # add the slashes and send a redirect. This circumvents Nginx's faulty # internal slash-adding mechanism. location ~/ {     autoindex on;     alias /home/$homedir/public_html/;     if ($trailingslashes = "") {         rewrite .* /~$homedir$filedir/ redirect;     } }

(this code comes from this blog http://blog.sbf5.com/?p=6)

Any ideas what this new error means. Seems related to a "new" feature added in 0.7.40.