rust/src/test/compile-fail/issue-22874.rs

// Copyright 2017 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.

struct Table {
    rows: [[String]],
    //~^ ERROR `[std::string::String]` does not have a constant size known at compile-time
}

fn f(table: &Table) -> &[String] {
    &table.rows[0]
}

fn main() {}