[1;31mAssertion failed[0m at [1mmain.rs[0m:5:2
  [35massert[0m[35m!( [0m[1;34mlet [0m[36mOk(foo)[0m[1;34m = [0m[33mResult::<i32, &str>::Err("Oh no!")[0m[35m )[0m
with expansion:
  [33mErr("Oh no!")[0m


thread 'main' panicked at main.rs:5:5
assertion failed
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
