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Diffstat (limited to '')
-rw-r--r-- | src/tools/clippy/tests/ui/write_with_newline.rs | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/write_with_newline.rs b/src/tools/clippy/tests/ui/write_with_newline.rs new file mode 100644 index 000000000..446d6914d --- /dev/null +++ b/src/tools/clippy/tests/ui/write_with_newline.rs @@ -0,0 +1,59 @@ +// 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"); +} |