rust/tests/ui/traits/const-traits/hir-const-check.rs

//@ compile-flags: -Znext-solver

// Regression test for #69615.

#![feature(const_trait_impl, effects)] //~ WARN the feature `effects` is incomplete

#[const_trait]
pub trait MyTrait {
    fn method(&self) -> Option<()>;
}

impl const MyTrait for () {
    fn method(&self) -> Option<()> {
        Some(())?; //~ ERROR `?` is not allowed in a `const fn`
        //~^ ERROR `?` cannot determine the branch of `Option<()>` in constant functions
        //~| ERROR `?` cannot convert from residual of `Option<()>` in constant functions
        None
    }
}

fn main() {}