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A function definition is an object that stores an entry point (address) of a sequence of instructions (the function) which computes a result from the parameters. There are some functions pre-defined by the intepreter. The user can define his/her own functions using some procedural statements.
The value of a function definition is equivalent to the function (address of the instruction sequence).
Note that the interpreter allows an identifier designating a RWV to be re-used as a function name but not vice versa, because the intepreter assumes all objects are RWV's initially.