Function call_native_translate_error

crates/vm/src/codecs.rs:1065–1102

this is a hack, for now

(
    handler: E,
    err: PyObjectRef,
    vm: &VirtualMachine,
)

// this is a hack, for now
fn call_native_translate_error<E>(
    handler: E,
    err: PyObjectRef,
    vm: &VirtualMachine,
) -> PyResult<(PyObjectRef, usize)>
where
    for<'a> E: EncodeErrorHandler<PyEncodeContext<'a>>,
{
    // let err = err.
    let range = extract_unicode_error_range(&err, vm)?;
    let s = PyStrRef::try_from_object(vm, err.get_attr("object", vm)?)?;
    let mut ctx = PyEncodeContext {
        vm,
        encoding: "",
        data: &s,
        pos: StrSize::default(),
        exception: OnceCell::from(err.downcast().unwrap()),
    };
    let mut iter = s.as_wtf8().code_point_indices();
    let start = StrSize {
        chars: range.start,
        bytes: iter.nth(range.start).unwrap().0,
    };
    let end = StrSize {
        chars: range.end,
        bytes: if let Some(n) = range.len().checked_sub(1) {
            iter.nth(n).map_or(s.byte_len(), |(i, _)| i)
        } else {
            start.bytes
        },
    };
    let (replace, restart) = handler.handle_encode_error(&mut ctx, start..end, None)?;
    let replace = match replace {
        EncodeReplace::Str(s) => s.into(),
        EncodeReplace::Bytes(b) => b.into(),
    };
    Ok((replace, restart.chars))
}

// TODO: exceptions with custom payloads
fn extract_unicode_error_range(err: &PyObject, vm: &VirtualMachine) -> PyResult<Range<usize>> {