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    use super::super::ser::part::{PartSerializer, Sink};
    use super::super::ser::Error;
    use serde::ser::Serialize;
    use std::str;
    use url::form_urlencoded::Serializer as UrlEncodedSerializer;
    use url::form_urlencoded::Target as UrlEncodedTarget;

    pub struct ValueSink<'key, 'target, Target>
    where
        Target: 'target + UrlEncodedTarget,
    {
        urlencoder: &'target mut UrlEncodedSerializer<Target>,
        key: &'key str,
    }

    impl<'key, 'target, Target> ValueSink<'key, 'target, Target>
    where
        Target: 'target + UrlEncodedTarget,
    {
        pub fn new(
            urlencoder: &'target mut UrlEncodedSerializer<Target>, key: &'key str,
        ) -> Self {
            ValueSink { urlencoder, key }
        }
    }

    impl<'key, 'target, Target> Sink for ValueSink<'key, 'target, Target>
    where
        Target: 'target + UrlEncodedTarget,
    {
        type Ok = ();

        fn serialize_str(self, value: &str) -> Result<(), Error> {
            self.urlencoder.append_pair(self.key, value);
            Ok(())
        }

        fn serialize_static_str(self, value: &'static str) -> Result<(), Error> {
            self.serialize_str(value)
        }

        fn serialize_string(self, value: String) -> Result<(), Error> {
            self.serialize_str(&value)
        }

        fn serialize_none(self) -> Result<Self::Ok, Error> {
            Ok(())
        }

        fn serialize_some<T: ?Sized + Serialize>(
            self, value: &T,
        ) -> Result<Self::Ok, Error> {
            value.serialize(PartSerializer::new(self))
        }

        fn unsupported(self) -> Error {
            Error::Custom("unsupported value".into())
        }
    }

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