// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution. // // 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. #![allow(clippy::print_literal, clippy::write_literal)] #![warn(clippy::print_stdout, clippy::use_debug)] use std::fmt::{Debug, Display, Formatter, Result}; #[allow(dead_code)] struct Foo; impl Display for Foo { fn fmt(&self, f: &mut Formatter) -> Result { write!(f, "{:?}", 43.1415) } } impl Debug for Foo { fn fmt(&self, f: &mut Formatter) -> Result { // ok, we can use `Debug` formatting in `Debug` implementations write!(f, "{:?}", 42.718) } } fn main() { println!("Hello"); print!("Hello"); print!("Hello {}", "World"); print!("Hello {:?}", "World"); print!("Hello {:#?}", "#orld"); assert_eq!(42, 1337); vec![1, 2]; }