src/Pure/Thy/sessions.scala

--- a/src/Pure/Thy/sessions.scala	Fri Aug 05 21:29:25 2022 +0200
+++ b/src/Pure/Thy/sessions.scala	Fri Aug 05 22:49:25 2022 +0200
@@ -126,6 +126,9 @@
         case Nil => this
         case errs => error(cat_lines(errs))
       }
+
+    def base_info(session: String): Base_Info =
+      Base_Info(sessions_structure, errors, apply(session), Nil)
   }
 
   def deps(sessions_structure: Structure,