[steveklabnik]

https://doc.rust-lang.org/stable/book/ is not purely problems, but does have some problem chapters. (I am a co-author.)

https://doc.rust-lang.org/stable/rust-by-example/ is the "by example" introduction, which is all about sample programs, but feels a bit dated, IMHO. Still not incorrect, but not up-to-date.

You may also like the O'Reilly book, or Rust In Action, which use more fully-featured example programs more heavily than The Book does.

[jxcl]

I was super impressed by the O’Reilly book, which throws you right in to writing a multithreaded Mandelbrot set plotter. It also goes through writing a multithreaded HTTP server. Pretty neat!