remove_user_printerParse.remove_user_printer : string * term -> unit
Removes a user-defined pretty-printing function associated with a particular name and term-pattern.
This removes the user-defined pretty-printing function that has been associated with a particular name (the name of the code for the function) and pattern (a term).
Never fails. If there is no user-printing function in the grammar associated with the provided key, the function has no effect.
As always, there is an accompanying function
temp_remove_user_printer, which does not affect the grammar
exported to disk.