Can not send/share between thread errors when working with async callbacks

help
1

Hi,

I have this bit of code on Rust Playground

It works okay if I remove the second argument in closure i.e. Arc<RwLock<Maelstorm>> but it breaks with this argument present. I already tried specifying send/sync constraints on the generic parameter but that doesn't fix it so I must be doing some thing wrong.
fn register<F, Fut>(&mut self, name: &str, func: F) where F: Fn(String, Arc<RwLock<Maelstorm>>) -> Fut + Send + Sync + 'static, Fut: Future<Output = Result<(), String>> + Send + Sync + 'static, {}

Can someone help me with this please ?

2

I needed to add Send+Sync marker traits on the BoxFuture. Fixed version is here Rust Playground

3

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