The existing test functions only check if a kind of fruit exists in the hashmap, but not if the amount of fruits is higher than zero. This new test function solves this.
The existing test can be solved with the following:
```rs
while let Some(integer) = optional_integers.pop() {
assert_eq!(integer.unwrap(), range);
```
Similarly with `expect(...)`, `unwrap_or(0)`, `unwrap_or_default()`, etc. However, none of these solutions use the learning point of stacking `Option<T>`s.
The updated test can _only_ be solved by stacking `Option<T>`s:
```rs
while let Some(Some(integer)) = optional_integers.pop() {
assert_eq!(integer, cursor);
```
With the updated test, using `unwrap` or `expect` will panic when it hits the `None` value, and using `unwrap_or` or `unwrap_or_default` will cause the final `assert_eq!(cursor, 0)` to panic.
The `macros4.rs` challenge can automatically be solved by rustfmt without the user noticing.
Adding `#[rustfmt::skip]` above the `macro_rules!` line fixes this issue.
I changed the sentence that referenced the imperative implementation in iterators5.rs.
That implementation was already removed and replaced with `todo!()`
Following the discussion in #1195 this is the best I could come up with.
The issue for me (and apparently a few other learners) was that the code
needed to complete the exercise was not _missing_, but was rather there
but wrong.
In the end, what made the difference between this exercise and others
(for me) was that in this exercise I was supposed to learn what to
*expect* of an output. So I think it makes sense here to let the learner
modify the tests and not the code itself.
Fixes#1195
Signed-off-by: Daan Wynen <black.puppydog@gmx.de>
# Conflicts:
# info.toml
Missed a blank line, which causes the prompt incorrect like below:
```rust
You can keep working on this exercise,
or jump into the next one by removing the `I AM NOT DONE` comment:
6 | // Make this code compile by using the proper Rc primitives to express that the sun has multiple owners.
7 |
8 | // I AM NOT DONE
9 | use std::rc::Rc;
```
Bert Apperlo
lazywalker
liv
liv
Noah May
Aaron Wang
PiqqiDesigns
lionel-rowe
Alan Gerber
Your Name
poneciak
Alexandre ESSE
Ali Afsharzadeh
Tom Kunc
Ed Sweeney
Ryan Whitehouse
hxztnxt
Adam Brewer
Chad Dougherty
0lhi
Aaron Suggs
Cyril MARPAUD
Sebastian Törnquist
Gleb Shevchenko
Daan Wynen
magnusrodseth
Kevin Wan
Jarrod Sanders
seporterfield