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9.2 Function names

The rules for function naming and function-argument naming are the same as for other variables; see the section on variables for more information on valid identifiers. For example,

real foo(real mu, real sigma);

declares a function named foo with two argument variables of types real and real. The arguments are named mu and sigma, but that is not part of the declaration. Two user-defined functions may not have the same name even if they have different sequences of argument types.