Clarify interfaction between File::set_len and file cursor
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@ -453,6 +453,10 @@ impl File {
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/// will be extended to `size` and have all of the intermediate data filled
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/// in with 0s.
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///
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/// The file's cursor isn't changed. In particular, if the cursor was at the
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/// end and the file is shrunk using this operation, the cursor will now be
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/// past the end.
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///
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/// # Errors
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///
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/// This function will return an error if the file is not opened for writing.
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