Function builtin_simple_warning 

fn builtin_simple_warning(
    args: &[RValue],
    _: &[(String, RValue)],
) -> Result<RValue, RError>

Construct a simple warning condition object.

@param message character string giving the warning message @param call the call associated with the warning (default NULL) @return a condition list with class c(“simpleWarning”, “warning”, “condition”)