thread 'main' has overflowed its stack

[Smicry]

There're something wrong with my code , but I don't know why ?
Please help me , thx very much!

use std::collections::HashMap;

enum SyntaxKind {
    Unknown,
}

impl std::fmt::Display for SyntaxKind {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(f, "{}", self)
    }
}

fn main() {
    let mut m = HashMap::new();
    m.insert("any", SyntaxKind::Unknown);

    match m.get("any"){
        Some(sk)=>println!("{}", sk),
        None=>println!("None")
    }

}

Output :

thread 'main' has overflowed its stack
fatal runtime error: stack overflow

[jonas-schievink]

Hi! This issue tracker is mainly meant for bug reports and concrete, small feature requests. Questions like this are better asked in the user forum at https://users.rust-lang.org/ or on one of the chat platforms used by the Rust community.