charles: "Ok, looks like ri is lying then, implying that at least a symbol is always required:

------------------------------------------------- Module#module_function
     module_function(symbol, ...)    => self
------------------------------------------------------------------------

The arity-one version would be safe as a method; the arity-zero version would not."

me: "I just checked:

    set_method_visibility(module, argc, argv, NOEX_PRIVATE);
    for (i=0; i<argc; i++) {

rdoc is indeed lying."