|drracket:language:module-language<%> : interface?|
The only language that implements this interface is DrRacket’s “Use the language declared in the source” language.
Returns the name of the language that is declared in the source, as a string.
Adds the module language to DrRacket. This is called during DrRacket’s startup.
Extends super% by overriding the put-file method to use a default name from the buffer, if the buffer contains something like (module name ...).