rust-clippy/tests/ui/print.rs

#![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)
        //~^ ERROR: use of `Debug`-based formatting
        //~| NOTE: `-D clippy::use-debug` implied by `-D warnings`
    }
}

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");
    //~^ ERROR: use of `println!`
    //~| NOTE: `-D clippy::print-stdout` implied by `-D warnings`
    print!("Hello");
    //~^ ERROR: use of `print!`

    print!("Hello {}", "World");
    //~^ ERROR: use of `print!`

    print!("Hello {:?}", "World");
    //~^ ERROR: use of `print!`
    //~| ERROR: use of `Debug`-based formatting

    print!("Hello {:#?}", "#orld");
    //~^ ERROR: use of `print!`
    //~| ERROR: use of `Debug`-based formatting

    assert_eq!(42, 1337);

    vec![1, 2];
}