PathBuf::set_extension accepts an extension containing slashes #32497
Description
The following code runs without any errors:
let mut p = Path::new("myfile.pdf").to_owned();
p.set_extension("txt/doc");
println!("{:?} {}", p, p.components().count());
// "myfile.txt/doc" 2I'm not sure what I expected this to do. Maybe panic? I would also have been ok with short-circuiting and returning false. But succeeding feels weird to me.
The set_file_name method has a similar problem. There's no return value on that one, so panicking might be the only option, if we don't like allowing slashes in the new filename.