54 lines
1.8 KiB
Rust
54 lines
1.8 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![warn(clippy::explicit_write)]
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fn stdout() -> String {
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String::new()
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}
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fn stderr() -> String {
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String::new()
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}
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fn main() {
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// these should warn
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{
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use std::io::Write;
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write!(std::io::stdout(), "test").unwrap();
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write!(std::io::stderr(), "test").unwrap();
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writeln!(std::io::stdout(), "test").unwrap();
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writeln!(std::io::stderr(), "test").unwrap();
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std::io::stdout().write_fmt(format_args!("test")).unwrap();
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std::io::stderr().write_fmt(format_args!("test")).unwrap();
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}
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// these should not warn, different destination
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{
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use std::fmt::Write;
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let mut s = String::new();
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write!(s, "test").unwrap();
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write!(s, "test").unwrap();
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writeln!(s, "test").unwrap();
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writeln!(s, "test").unwrap();
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s.write_fmt(format_args!("test")).unwrap();
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s.write_fmt(format_args!("test")).unwrap();
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write!(stdout(), "test").unwrap();
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write!(stderr(), "test").unwrap();
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writeln!(stdout(), "test").unwrap();
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writeln!(stderr(), "test").unwrap();
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stdout().write_fmt(format_args!("test")).unwrap();
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stderr().write_fmt(format_args!("test")).unwrap();
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}
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// these should not warn, no unwrap
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{
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use std::io::Write;
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std::io::stdout().write_fmt(format_args!("test")).expect("no stdout");
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std::io::stderr().write_fmt(format_args!("test")).expect("no stderr");
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}
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}
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