The Singleton class defines a singleton, ie. a word or phrase which may only be mentioned once in the documentation. It is used to ensure that only one Intro introduces a given Class or other Intro.
If a Singleton is created for a the same name as an already existing Singleton, error messages are omitted for both of them.
Constructs a Singleton to name, which is located at file, line.
Returns the File where this Singleton was defined.
Returns the line number where this Singleton was defined.
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