irule editor

I think you're missing a closing brace.

 when HTTP_REQUEST {
   if { [HTTP::host] contains "visitor-stg.cummins.com" } {
     HTTP::redirect "https://loginstage.cummins.com/oamfed/idp/initiatesso?providerid=Visitor"
   } elseif {  [HTTP::uri] starts_with "/visitor.cummins.com" } {
     pool visitor-stg
   }
 }

This parses correctly.