use std::sync::Mutex; fn main() -> Result<(), Box<dyn std::error::Error>> { static PEDANTRY: Mutex<u64> = Mutex::new(0); *PEDANTRY.lock()? += 1; println!("{}", PEDANTRY.lock()?); Ok(()) }
And declaring a static variable inside a function, even if in main, smells.
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static mut COUNTER: u32 = 0;
If on 2024 edition, you will additionally need
#![allow(static_mut_refs)]
