issue-30143.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.

use std::fmt::Write;

fn main() {
    println!(0);
    //~^ ERROR format argument must be a string literal
    eprintln!('a');
    //~^ ERROR format argument must be a string literal
    let mut s = String::new();
    writeln!(s, true).unwrap();
    //~^ ERROR format argument must be a string literal
}