Hands-on Rust: missing instructions to add out to map_builder

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Title: Hands-on Rust: missing instructions to add out to map_builder (274)

(Maybe it’s time to assume the reader will know how to “fit” this,)
On pg. 274, the map_builder.map.tiles[exit_idx] = TileType::Exit; line required me to also change the declaration of map_builder to make it mutable.

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Thanks! I’ll include that in the next beta. Ciel spotted that one, too. :slight_smile:

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