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To record a failed error entity while deleting a Redis key in Rust, you can use the Result type to handle the possible error that may occur during the deletion operation. Here is an example code snippet that demonstrates how to delete a Redis key and record a failed error entity using the Result type:

use redis::{Client, RedisError};

fn delete_key(redis_url: &str, key: &str) -> Result<(), RedisError> {
    let client = Client::open(redis_url)?;
    let mut con = client.get_connection()?;
    let _: () = con.del(key)?;
    Ok(())
}

fn main() {
    let redis_url = "redis://127.0.0.1/";
    let key = "my_key";

    match delete_key(redis_url, key) {
        Ok(_) => println!("Key deleted successfully"),
        Err(e) => {
            println!("Error occurred while deleting key: {:?}", e);
            // Record failed error entity here.
        }
    }
}

In this example, the delete_key function takes a Redis URL and a key as arguments, and returns a Result that can either be successful with Ok(()) or unsuccessful with an Err that contains a RedisError.

The function uses the Client and Connection types from the Redis crate to connect to the Redis server and delete the specified key using the del method of Redis. If an error occurs during this process, the function returns an Err containing the RedisError.

In the main function, we call the delete_key function and handle the Result accordingly. If it is successful, we print a message indicating that the key was deleted successfully. If it fails, we print a message containing the error and record the failed error entity as needed.