Rust and base64 encoding decode madness

rust_base64_madness.rs

// YOU HAVE LOTS OF...OPTIONS WITH RUST'S BASE64 ECOSYSTEM. base64::decode() was deprecated Jan 2023
//
// use base64; // let key = base64::decode(base64_key); // <=== classic method, but will throw Deprecation warnings
// use base64::prelude::*; // let key = BASE64_STANDARD.decode(base64_key)?;
// use data_encoding::BASE64; // let key = BASE64.decode( b"SGVsbA...gh=" ) // b prefix is required
// use base64::{Engine as _, alphabet, engine::{self, general_purpose}}; // let key = general_purpose::STANDARD.decode(...);
// use base64::{Engine as _, engine::{general_purpose}}; // let key = general_purpose::STANDARD.decode(...);
// use base64::{Engine as _, engine::general_purpose}; // let key = general_purpose::STANDARD.decode(...);
// use base64::{Engine as _, engine::{general_purpose::STANDARD as base64}}; // let key = base64.decode(...); // DANGER!!
// use base64::{Engine as _, engine::{general_purpose as BASE64}}; // let key = BASE64::STANDARD.decode(...);
// use base64::{Engine as _, engine::{general_purpose::STANDARD as BASE64}}; // let key = BASE64.decode(...);
//use base64::{Engine as _, engine::{general_purpose as BASE64}}; // let key = BASE64::STANDARD.decode(...).unwrap();

use base64::{Engine as _, engine::{general_purpose as BASE64}};

...                                                                   
                                                                   
    let base64_key = "Mng0NCt4ZHVUYUJCa1k....xNk";
    let key = BASE64::STANDARD.decode(base64_key).unwrap();

my compiler warns me about "unnecessary braces", so I have:

use base64::{Engine as _, engine::general_purpose::STANDARD as BASE64};
let key = BASE64.decode(...);