Function interp_show_class 

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

Display information about an S4 class.

Shows class details from the registry including slots and inheritance.

@param Class character string naming the class @return NULL, invisibly