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Add test for io::Error's size.
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library/std/src/io/error/tests.rs

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@@ -1,9 +1,15 @@
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use super::{Custom, Error, ErrorKind, Repr};
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use crate::error;
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use crate::fmt;
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use crate::mem::size_of;
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use crate::sys::decode_error_kind;
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use crate::sys::os::error_string;
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#[test]
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fn test_size() {
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assert!(size_of::<Error>() <= size_of::<[usize; 2]>());
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}
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#[test]
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fn test_debug_error() {
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let code = 6;

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