const generic ty's with lifetimes cause opaque types to ICE #111911
Description
Due to the desugaring of async functions, the adt_const_params feature prevents usage of non-numeric const params as parameters to async functions, or to impl blocks containing async functions.
For example:
#![feature(adt_const_params)]
pub async fn foo<const X: &'static str>() {}yields the following error:
error: const parameter `X` is part of concrete type but not used in parameter list for the `impl Trait` type alias
--> src/lib.rs:3:43
|
3 | pub async fn foo<const X: &'static str>() {}
| ^^