dyn object infer error???

[yuyang-ok]

I have this code

    fn clone(&self) -> Box<dyn SchemaTrait> {
        Box::new(Clone::clone(self))
    }

expected Box<dyn SchemaTrait + 'static, Global>, found Box<ClickHouseDB, Global> 

and Self is implemented SchemaTrait .
the code can compile

[ChayimFriedman2]

Do you have a reproduction you can publish?

[yuyang-ok]

No I am sorry, I will try later right now I use convert to fix like this.

 Box::new(Clone::clone(self)) as Box<dyn SchemaTrait>

[Veetaha]

This reproduces for me with the async_trait macro. The important nuance is that the async_trait proc macro is ignored in the settings:

{
  "rust-analyzer.procMacro.ignored": {
    "async-trait": ["async_trait"]
  }
}

I put it into the ignore list long time ago simply because this way RA provided better intellisence and editing experience. RA doesn't have to worry about expanding the macro, mapping token spans and handling partially correct syntax tree input.

use async_trait::async_trait;

#[async_trait]
trait Trait {
    async fn method(&self);
}

struct Impl;

#[async_trait]
impl Trait for Impl {
    async fn method(&self) {}
}

fn main() {
    let _: Box<dyn Trait> = Box::new(Impl);
}

[ChayimFriedman2]

This is not a bug then. Ignoring async_trait means the trait is not dyn compatible, therefore the coercion is indeed invalid.