Separate Log for Robot Page Access

[Wohbah]

To record robots in another log I have a boolean $is_robot.  The variable is
set correctly.  But I can't use it.  (nginx version 0.765-1)

Why can I do
if ( ... ) { ... access_log  off; ... }
but not
if ( ... ) { ... access_log  /var/log/nginx/robots.log; ... }

When a robot visits, it gets error 500.  No web page.  Must I duplicate
every location to change access_log settings?  Here is the topmost one:


        location / {
          access_log  /var/log/nginx/access.log;
          
          ...much stuff I do not like duplicating, several lines...

          if ( $is_robot ~ T ) {
            access_log  /var/log/nginx/robots.log;
          }
          try_files /maintenance.html $uri.html @phptry ;
        }


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