Function protobuf::rt::read_proto2_enum_with_unknown_fields_into

pub fn read_proto2_enum_with_unknown_fields_into<E: ProtobufEnum>(
    wire_type: WireType,
    is: &mut CodedInputStream<'_>,
    target: &mut Option<E>,
    field_number: u32,
    unknown_fields: &mut UnknownFields
) -> ProtobufResult<()>

Read repeated enum field into given vec, and when value is unknown store it in unknown fields which matches proto2 spec.

See explanation here