Function serde_with::rust::maps_first_key_wins::deserialize

pub fn deserialize<'de, D, T, K, V>(deserializer: D) -> Result<T, D::Error> where
    T: DuplicateInsertsFirstWinsMap<K, V>,
    K: Deserialize<'de>,
    V: Deserialize<'de>,
    D: Deserializer<'de>, 

Deserialize a map and return an error on duplicate keys