fix another typo
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@ -1284,7 +1284,7 @@ fn file_double<P: AsRef<Path>>(file_path: P) -> Result<i32, String> {
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Earlier, we promised that we could get rid of the `map_err` calls. Indeed, all
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we have to do is pick a type that `From` works with. As we saw in the previous
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section, `From` has an impl that let's it convert any error type into a
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section, `From` has an impl that lets it convert any error type into a
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`Box<Error>`:
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```rust
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