This is my first program in Rust, so for this purpose I've chosen a well-known, simple and open source application: cat.
In my Rust implementation all GNU cat's flags are available and work exactly like the original, so you can consider "my" cat as a drop-in replacement for it, excluding error messages (see What's bad paragraph).
Currently, this program will stop at the first file error instead of printing a message and skipping it, like the original cat. This is not something I want to improve now as I want to move to other projects. Feel free to subit a PR if you wish, otherwise I'll probably fix this behavior in future.
I'd really like to thank the Rust Reddit community, it's been very helpful to me. You can see youself their great job in this discussion.