rustc/tests/ui/const-generics/infer/method-chain.rs

struct Foo;

impl Foo {
    fn bar(self) -> Foo {
        Foo
    }

    fn baz<const N: usize>(self) -> Foo {
        println!("baz: {}", N);
        Foo
    }
}

fn main() {
    Foo.bar().bar().bar().bar().baz(); //~ ERROR type annotations needed
}