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The `"nice weather".into()` line could be solved with either `string_slice` or `string`. The `string_slice` choice compiled and passed the exercise while emitting a `clippy::useless_conversion` warning, so the exercise could pass with a warning still present. Understanding why `.into()` works for both targets requires the `From` trait, which rustlings introduces later. Remove the example from the exercise and solution. Fixes #2190
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