--- /dev/null
+// 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!(&mut v, "Hello\n");
+ write!(&mut v, "Hello {}\n", "world");
+ write!(&mut v, "Hello {} {}\n", "world", "#2");
+ write!(&mut v, "{}\n", 1265);
+ write!(&mut v, "\n");
+
+ // These should be fine
+ write!(&mut v, "");
+ write!(&mut v, "Hello");
+ writeln!(&mut v, "Hello");
+ writeln!(&mut v, "Hello\n");
+ writeln!(&mut v, "Hello {}\n", "world");
+ write!(&mut v, "Issue\n{}", 1265);
+ write!(&mut v, "{}", 1265);
+ write!(&mut v, "\n{}", 1275);
+ write!(&mut v, "\n\n");
+ write!(&mut v, "like eof\n\n");
+ write!(&mut v, "Hello {} {}\n\n", "world", "#2");
+ writeln!(&mut v, "\ndon't\nwarn\nfor\nmultiple\nnewlines\n"); // #3126
+ writeln!(&mut v, "\nbla\n\n"); // #3126
+
+ // Escaping
+ write!(&mut v, "\\n"); // #3514
+ write!(&mut v, "\\\n"); // should fail
+ write!(&mut v, "\\\\n");
+
+ // Raw strings
+ write!(&mut v, r"\n"); // #3778
+
+ // Literal newlines should also fail
+ write!(
+ &mut v,
+ "
+"
+ );
+ write!(
+ &mut v,
+ r"
+"
+ );
+
+ // Don't warn on CRLF (#4208)
+ write!(&mut v, "\r\n");
+ write!(&mut v, "foo\r\n");
+ write!(&mut v, "\\r\n"); //~ ERROR
+ write!(&mut v, "foo\rbar\n");
+}