rust/src/test/ui/macros/must-use-in-macro-55516.rs
2018-12-25 21:08:33 -07:00

12 lines
230 B
Rust

// compile-pass
// compile-flags: -Wunused
// make sure write!() can't hide its unused Result
fn main() {
use std::fmt::Write;
let mut example = String::new();
write!(&mut example, "{}", 42); //~WARN must be used
}