rust/src/test/run-pass/impl-trait/nesting.rs

// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// run-pass

fn foo<T>(t: T) -> impl Into<[T; { const FOO: usize = 1; FOO }]> {
    [t]
}

fn bar() -> impl Into<[u8; { const FOO: usize = 1; FOO }]> {
    [99]
}

fn main() {
    println!("{:?}", foo(42).into());
    println!("{:?}", bar().into());
}