Autocomplete for `-> impl Future<Output = ()>` in trait implementation adds unnecessary `-> ()` to function signature

[not-nullptr]

rust-analyzer version: 0.3.2702-standalone (d646b23f00 2025-11-30)

rustc version: rustc 1.91.1 (ed61e7d7e 2025-11-07)

editor or extension: VSCode 1.106.3

code snippet to reproduce:

trait ModernAsyncTrait {
    fn do_something(&self) -> impl Future<Output = ()>;
}

struct MyStruct;

impl ModernAsyncTrait for MyStruct {
	/* ctrl + space and hit enter here on the `async fn do_something(..)` item -- it'll produce the following: */
	//                           vvvvv
	async fn do_something(&self) -> () {
		
	}
}

When autocompleting with RA in VSCode for async traits which use impl Future<Output = ()>, RA will automatically add a unit return type to the function in the trait, which is unnecessary.