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Rollup merge of rust-lang#34129 - jviide:from-string-box-error, r=ste…
…veklabnik Remove a gotcha from book/error-handling.md The book's "Error handling with `Box<Error>`" section talks about `Box<Error>`. In the actual example `Box<Error + Send + Sync>` is used instead so that the corresponding From impls could be used to convert a plain string to an error type. Rust 1.7 added support for conversion from `&str`/`String` to `Box<Error>`, so this gotcha and later references to it can now be removed. r? @steveklabnik
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