lib.rs

use std::error::Error;

use ethers_providers::Provider;

trait ClientGeneric<T>
where
    for<'a> &'a str: TryInto<Provider<T>>,
    for<'a> <&'a str as TryInto<Provider<T>>>::Error: Error + 'static,
{
    fn get_client(&self, url: &str) -> Result<Provider<T>, Box<dyn Error>> {
        Ok(url.try_into()?)
    }
}

impl<T, U> ClientGeneric<U> for T
where
    for<'a> &'a str: TryInto<Provider<U>>,
    for<'a> <&'a str as TryInto<Provider<U>>>::Error: Error + 'static,
{
}

struct Test;

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn test_get_client_generic() {
        let test = Test {};
        let _client = test.get_client("http://localhost:8080").unwrap();
    }
}