1 #![allow(unused_must_use)]
2 #![warn(write_literal)]
7 let mut v = Vec::new();
9 // These should be fine
10 write!(&mut v, "Hello");
11 writeln!(&mut v, "Hello");
13 writeln!(&mut v, "Hello {}", world);
14 writeln!(&mut v, "3 in hex is {:X}", 3);
16 // These should throw warnings
17 write!(&mut v, "Hello {}", "world");
18 writeln!(&mut v, "Hello {} {}", world, "world");
19 writeln!(&mut v, "Hello {}", "world");
20 writeln!(&mut v, "10 / 4 is {}", 2.5);
21 writeln!(&mut v, "2 + 1 = {}", 3);
22 writeln!(&mut v, "2 + 1 = {:.4}", 3);
23 writeln!(&mut v, "2 + 1 = {:5.4}", 3);
24 writeln!(&mut v, "Debug test {:?}", "hello, world");
26 // positional args don't change the fact
27 // that we're using a literal -- this should
29 writeln!(&mut v, "{0} {1}", "hello", "world");
30 writeln!(&mut v, "{1} {0}", "hello", "world");
32 // named args shouldn't change anything either
33 writeln!(&mut v, "{foo} {bar}", foo = "hello", bar = "world");
34 writeln!(&mut v, "{bar} {foo}", foo = "hello", bar = "world");