Wrong generic for `ReadExpect` makes the game crash

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Assessment

Difficulty
1/5
Estimated time
Under an hour
Newbie friendliness
68/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Stale
Tech stack
rust
Domain
documentation

Research direction

Open book/src/chapter_54.md at the referenced line 173 and compare the generic used by ReadExpect. Change it from ReadExpect<'a, Position> to ReadExpect<'a, Point>, then run the tutorial and choose New Game to confirm the crash no longer occurs.

Written by the indexing model from the issue text.

Description

https://github.com/amethyst/rustrogueliketutorial/blob/33872fe582f226178436847e1f74eafcbf9c0d1a/book/src/chapter_54.md?plain=1#L173

This line should be ReadExpect<'a, Point> instead of ReadExpect<'a, Position>.
This actually makes the game crash after hitting New Game.

Dominant language
Rust
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Forks
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