mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-09-20 22:51:58 +00:00
64 lines
2.4 KiB
Rust
64 lines
2.4 KiB
Rust
#![warn(clippy::write_literal)]
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#![allow(clippy::uninlined_format_args, unused_must_use)]
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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!(v, "Hello");
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writeln!(v, "Hello");
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let world = "world";
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writeln!(v, "Hello {}", world);
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writeln!(v, "Hello {world}", world = world);
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writeln!(v, "3 in hex is {:X}", 3);
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writeln!(v, "2 + 1 = {:.4}", 3);
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writeln!(v, "2 + 1 = {:5.4}", 3);
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writeln!(v, "Debug test {:?}", "hello, world");
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writeln!(v, "{0:8} {1:>8}", "hello", "world");
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writeln!(v, "{1:8} {0:>8}", "hello", "world");
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writeln!(v, "{foo:8} {bar:>8}", foo = "hello", bar = "world");
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writeln!(v, "{bar:8} {foo:>8}", foo = "hello", bar = "world");
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writeln!(v, "{number:>width$}", number = 1, width = 6);
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writeln!(v, "{number:>0width$}", number = 1, width = 6);
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writeln!(v, "{} of {:b} people know binary, the other half doesn't", 1, 2);
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writeln!(v, "10 / 4 is {}", 2.5);
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writeln!(v, "2 + 1 = {}", 3);
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writeln!(v, "From expansion {}", stringify!(not a string literal));
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// these should throw warnings
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write!(v, "Hello world");
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//~^ ERROR: literal with an empty format string
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//~| NOTE: `-D clippy::write-literal` implied by `-D warnings`
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writeln!(v, "Hello {} world", world);
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//~^ ERROR: literal with an empty format string
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writeln!(v, "Hello world");
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//~^ ERROR: literal with an empty format string
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writeln!(v, "a literal {:.4}", 5);
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//~^ ERROR: literal with an empty format string
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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!(v, "hello world");
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//~^ ERROR: literal with an empty format string
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writeln!(v, "world hello");
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//~^ ERROR: literal with an empty format string
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// named args shouldn't change anything either
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writeln!(v, "hello world");
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//~^ ERROR: literal with an empty format string
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writeln!(v, "world hello");
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//~^ ERROR: literal with an empty format string
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// #10128
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writeln!(v, "hello {0} world", 2);
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//~^ ERROR: literal with an empty format string
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writeln!(v, "world {0} hello", 2);
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//~^ ERROR: literal with an empty format string
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writeln!(v, "hello {0} {1}, {bar}", 2, 3, bar = 4);
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//~^ ERROR: literal with an empty format string
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writeln!(v, "hello {0} {1}, world {2}", 2, 3, 4);
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//~^ ERROR: literal with an empty format string
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}
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