rust-clippy/tests/ui/write_with_newline.rs

59 lines
1.3 KiB
Rust

// FIXME: Ideally these suggestions would be fixed via rustfix. Blocked by rust-lang/rust#53934
// // run-rustfix
#![allow(clippy::write_literal)]
#![warn(clippy::write_with_newline)]
use std::io::Write;
fn main() {
let mut v = Vec::new();
// These should fail
write!(v, "Hello\n");
write!(v, "Hello {}\n", "world");
write!(v, "Hello {} {}\n", "world", "#2");
write!(v, "{}\n", 1265);
write!(v, "\n");
// These should be fine
write!(v, "");
write!(v, "Hello");
writeln!(v, "Hello");
writeln!(v, "Hello\n");
writeln!(v, "Hello {}\n", "world");
write!(v, "Issue\n{}", 1265);
write!(v, "{}", 1265);
write!(v, "\n{}", 1275);
write!(v, "\n\n");
write!(v, "like eof\n\n");
write!(v, "Hello {} {}\n\n", "world", "#2");
writeln!(v, "\ndon't\nwarn\nfor\nmultiple\nnewlines\n"); // #3126
writeln!(v, "\nbla\n\n"); // #3126
// Escaping
write!(v, "\\n"); // #3514
write!(v, "\\\n"); // should fail
write!(v, "\\\\n");
// Raw strings
write!(v, r"\n"); // #3778
// Literal newlines should also fail
write!(
v,
"
"
);
write!(
v,
r"
"
);
// Don't warn on CRLF (#4208)
write!(v, "\r\n");
write!(v, "foo\r\n");
write!(v, "\\r\n"); //~ ERROR
write!(v, "foo\rbar\n");
}