Function builtin_register_s3_method 

fn builtin_register_s3_method(
    args: &[RValue],
    _named: &[(String, RValue)],
    ctx: &BuiltinContext<'_>,
) -> Result<RValue, RError>

registerS3method — register an S3 method in a namespace. @param genname character: generic function name @param class character: class name @param method function: the method @param envir environment: where to register @namespace base