While doing this exercise, I was surprised to see “no property” errors for iota and canFind. I didn’t use them in my code, and discovered their use in the tests.
I think students don’t need to be bothered about this. I suggest
import std.range : iota;
import std.algorithm : canFind;
be added to the specific test where they are used.
I’d like to submit a PR for this, if maintainers agree.