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9.3 Diversion numbers

The current diversion is tracked by the builtin divnum:

— Builtin: divnum

Expands to the number of the current diversion. 

     Initial divnum
     =>Initial 0
     divert(`1')
     Diversion one: divnum
     divert(`2')
     Diversion two: divnum
     ^D
     =>
     =>Diversion one: 1
     =>
     =>Diversion two: 2