rust/tests/ui/stability-attribute/missing-const-stability.rs

#![feature(staged_api)]
#![feature(const_trait_impl)]
#![stable(feature = "stable", since = "1.0.0")]

#[stable(feature = "stable", since = "1.0.0")]
pub const fn foo() {} //~ ERROR function has missing const stability attribute

#[unstable(feature = "unstable", issue = "none")]
pub const fn bar() {} // ok because function is unstable

#[stable(feature = "stable", since = "1.0.0")]
pub struct Foo;
impl Foo {
    #[stable(feature = "stable", since = "1.0.0")]
    pub const fn foo() {} //~ ERROR associated function has missing const stability attribute

    #[unstable(feature = "unstable", issue = "none")]
    pub const fn bar() {} // ok because function is unstable
}

#[stable(feature = "stable", since = "1.0.0")]
#[const_trait]
pub trait Bar {
    #[stable(feature = "stable", since = "1.0.0")]
    fn fun();
}
#[stable(feature = "stable", since = "1.0.0")]
impl const Bar for Foo {
    //~^ ERROR implementation has missing const stability attribute
    fn fun() {}
}

fn main() {}