rust-clippy/tests/ui/writeln_empty_string.fixed

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#![allow(unused_must_use)]
#![warn(clippy::writeln_empty_string)]
use std::io::Write;
fn main() {
let mut v = Vec::new();
// These should fail
writeln!(v);
let mut suggestion = Vec::new();
writeln!(suggestion);
// These should be fine
writeln!(v);
writeln!(v, " ");
write!(v, "");
}