Function resolve_conversion_error_class_marker 

pub(crate) fn resolve_conversion_error_class_marker(
    class: Vec<String>,
    crate_classes: &[&str],
) -> Vec<String>

class with CONVERSION_ERROR_CLASS_MARKER replaced by crate_classes, in place, as the generated .miniextendr_raise_condition replaces it in R. A raising guard has no generated R to do it, so it calls this with crate_conversion_error_class.