Function loan_clean_price_at_oas_with 

pub(crate) fn loan_clean_price_at_oas_with<R: Scalar>(
    loan: &CallableLoan,
    view: &PricingView<'_, R>,
    oas: R,
) -> Result<R, PricingError>

A callable loan’s clean price per 100 of its outstanding at a continuous oas, as clean_price_at_oas_with reads a callable bond’s.