Why is 'futures::prelude::*; undecleared - rust

Question

For some reason it is telling me that it is undeclared when i am trying to follow an example for an IRC in rust and it makes no sense that it is not working cause i have used libraries like this before and it worked before so idk what is happening \
code:
use futures::prelude::*;
use irc::client::prelude::*;
#[tokio::main]
async fn main() -> irc::error::Result<()> {
let config = Config {
nickname: Some("pickles".to_owned()),
server: Some("chat.freenode.net".to_owned()),
channels: vec!["#rust-spam".to_owned()],
..Default::default()
};
let mut client = Client::from_config(config).await?;
client.identify()?;
let mut stream = client.stream()?;
let sender = client.sender();
while let Some(message) = stream.next().await.transpose()? {
print!("{}", message);
match message.command {
Command::PRIVMSG(ref target, ref msg) => {
if msg.contains(client.current_nickname()) {
sender.send_privmsg(target, "Hi!")?;
}
}
_ => (),
}
}
Ok(())
}
Errors
--> src\main.rs:1:5
|
1 | use futures::prelude::*;
| ^^^^^^^ use of undeclared type or module `futures`
error[E0308]: mismatched types
--> src\main.rs:9:19
|
9 | channels: vec!["#rust-spam".to_owned()],
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| expected enum `std::option::Option`, found struct `std::vec::Vec`
| help: try using a variant of the expected enum: `Some(<[_]>::into_vec(box [$($x),+]))`
|
= note: expected enum `std::option::Option<std::vec::Vec<_>>`
found struct `std::vec::Vec<_>`
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0599]: no function or associated item named `from_config` found for trait object `dyn irc::client::Client` in the current scope
--> src\main.rs:13:30
|
13 | let mut client = Client::from_config(config).await?;
| ^^^^^^^^^^^ function or associated item not found in `dyn irc::client::Client`
Cargo.toml
[package]
name = "irc"
version = "0.1.0"
authors = ["sudo"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
irc = "0.13"
tokio = { version = "0.2.22", features = ["full"] }
Edit: Added Cargo.toml

Answer 1

You will need to add the futures crate to your cargo file. E.g. from the docs
[dependencies]
futures = "0.3"

Answer 2

You need to add futures to your Cargo.toml, even though a dependency already depends on it.