src/test/ui/parser/issue-20711-2.rs

// compile-flags: -Z parse-only
// ignore-tidy-linelength

struct Foo;

impl Foo {
    fn foo() {}

    #[stable(feature = "rust1", since = "1.0.0")]
} //~ ERROR expected one of `async`, `const`, `crate`, `default`, `existential`, `extern`, `fn`, `pub`, `type`, or

fn main() {}