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Convert exercises with assertions to tests
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You can easily get this to compile with `vec0` being `[]` and `vec1` being `[22, 44, 66, 88]`
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closes #859
closes #913
closes #942
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Instead of having to explain why
```rs
let mut x = 100;
let y = &mut x;
let mut z_owned = *y;
let z = &mut z_owned;
*y += 100;
*z += 1000;
```
and
```rs
let mut x = 100;
let y = &mut x;
let z = &mut *y;
*y += 100;
*z += 1000;
```
are different, you still get the point across about having only one mutable reference.
As it stands, this exercise does too much (dereferencing and having only one mutable reference), and by doing so confuses people.
Example of someone being confused by this:
<https://discord.com/channels/273534239310479360/273541522815713281/872689531428692040>
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Improve the hints for move_semantics5, as well as the explanatory
comments in the code.
Previously, it was not clear what possible changes were allowed.
It seems that reordering the statements might be the intended solution.
The previous comment about not "adding newlines" doesn't make sense,
so treating it as "adding new lines" makes it more clear.
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* feat: Add move_semantics5 exercise.
* feat: Add option3 exercise
* Address review comments. Fix typos, sentence formatting.
* Remove unwanted newline.
* Address review comments: make comment inline, fix format in print.
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all exercises readme files now have a unified structure and a description
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* Small readbility improvement move_semantics4 doc
* Remove `an` as it refers to the argument
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The introduction of `I AM NOT DONE` shifted the lines of all
exercises, which now need adjustment.
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Hints are now accessible using the CLI subcommand `rustlings hint
<exercise name`.
BREAKING CHANGE: This fundamentally changes the way people interact with exercises.
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The `watch` command now requires user action to move to the next
exercise.
BREAKING CHANGE: this changes the behavior of `watch`.
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chore: Fix a couple broken book links
While I was fixing these, I figured maybe it's good to just use a consistent URL for book links: https://doc.rust-lang.org/book/
Is there a plan for what to do with this old 1.4.0 example that doesn't exist in the current version of the book? Perhaps at least include a disclaimer when recommending that folks check it out?
https://github.com/rust-lang/rustlings/blob/34e31232dfddde284a341c9609b33cd27d9d5724/exercises/threads/README.md#L1
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Forgot to add changes to last commit.
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Sub READMEs contain the relevant resources from the main
README of the web version. All second edition Rust Book links
were updated to the 2018 edition.
Fixed to typos in main README.md.
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