langchain-rust 4.6.0

LangChain for Rust, the easiest way to write LLM-based programs in Rust
Documentation 
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use std::error::Error;

use async_trait::async_trait;

use super::Document;

#[async_trait]
pub trait Retriever: Sync + Send {
    async fn get_relevant_documents(&self, query: &str) -> Result<Vec<Document>, Box<dyn Error>>;
}

impl<R> From<R> for Box<dyn Retriever>
where
    R: Retriever + 'static,
{
    fn from(retriever: R) -> Self {
        Box::new(retriever)
    }
}