Hands-on Rust B4.0 274: need to add mut to map_builder

When commenting out the “spawn amulet” function and adding exit_idx and assigning a tile to TileType::Exit you need to also change the map_builder line to “let mut map_builder =…” in order to update the tile.

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Thanks! I’ve added this to the issue tracker to check and fix for beta 5.

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