Fix wrong type name: IoError<()> -> IoResult<()>
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@ -185,7 +185,7 @@ struct. In order to help with this, the `Formatter` struct also provides some
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helper methods.
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Additionally, the return value of this function is `fmt::Result` which is a
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typedef to `Result<(), IoError>` (also known as `IoError<()>`). Formatting
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typedef to `Result<(), IoError>` (also known as `IoResult<()>`). Formatting
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implementations should ensure that they return errors from `write!` correctly
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(propagating errors upward).
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