Function abi_stable::prefix_type::panic_on_missing_field_val

pub fn panic_on_missing_field_val(
    field_index: Option<usize>, 
    field: PTField, 
    expected: &'static PTStructLayout, 
    actual: &'static PTStructLayout
) -> !

Used to panic with an error message informing the user that a field is expected to be on expected when it's not.