56 lines
2.0 KiB
Rust
56 lines
2.0 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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#![feature(tool_lints)]
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#![allow(unused_must_use)]
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#![warn(clippy::write_literal)]
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use std::io::Write;
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fn main() {
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let mut v = Vec::new();
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// these should be fine
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write!(&mut v, "Hello");
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writeln!(&mut v, "Hello");
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let world = "world";
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writeln!(&mut v, "Hello {}", world);
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writeln!(&mut v, "Hello {world}", world=world);
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writeln!(&mut v, "3 in hex is {:X}", 3);
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writeln!(&mut v, "2 + 1 = {:.4}", 3);
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writeln!(&mut v, "2 + 1 = {:5.4}", 3);
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writeln!(&mut v, "Debug test {:?}", "hello, world");
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writeln!(&mut v, "{0:8} {1:>8}", "hello", "world");
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writeln!(&mut v, "{1:8} {0:>8}", "hello", "world");
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writeln!(&mut v, "{foo:8} {bar:>8}", foo="hello", bar="world");
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writeln!(&mut v, "{bar:8} {foo:>8}", foo="hello", bar="world");
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writeln!(&mut v, "{number:>width$}", number=1, width=6);
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writeln!(&mut v, "{number:>0width$}", number=1, width=6);
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// these should throw warnings
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writeln!(&mut v, "{} of {:b} people know binary, the other half doesn't", 1, 2);
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write!(&mut v, "Hello {}", "world");
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writeln!(&mut v, "Hello {} {}", world, "world");
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writeln!(&mut v, "Hello {}", "world");
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writeln!(&mut v, "10 / 4 is {}", 2.5);
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writeln!(&mut v, "2 + 1 = {}", 3);
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// positional args don't change the fact
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// that we're using a literal -- this should
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// throw a warning
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writeln!(&mut v, "{0} {1}", "hello", "world");
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writeln!(&mut v, "{1} {0}", "hello", "world");
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// named args shouldn't change anything either
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writeln!(&mut v, "{foo} {bar}", foo="hello", bar="world");
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writeln!(&mut v, "{bar} {foo}", foo="hello", bar="world");
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}
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