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Rollup merge of #63293 - shepmaster:align-to-doc, r=RalfJung

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Clarify align_to's requirements and obligations

Based on discussions with @RalfJung around my misunderstandings when using this.

r? @RalfJung
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Mazdak Farrokhzad 2019-08-06 08:17:47 +02:00 committed by GitHub
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1 changed files with 8 additions and 6 deletions
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14
src/libcore/slice/mod.rs
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@ -2308,9 +2308,10 @@ impl<T> [T] {
/// maintained.
///
/// This method splits the slice into three distinct slices: prefix, correctly aligned middle
/// slice of a new type, and the suffix slice. The method does a best effort to make the
/// middle slice the greatest length possible for a given type and input slice, but only
/// your algorithm's performance should depend on that, not its correctness.
/// slice of a new type, and the suffix slice. The method may make the middle slice the greatest
/// length possible for a given type and input slice, but only your algorithm's performance
/// should depend on that, not its correctness. It is permissible for all of the input data to
/// be returned as the prefix or suffix slice.
///
/// This method has no purpose when either input element `T` or output element `U` are
/// zero-sized and will return the original slice without splitting anything.
@ -2361,9 +2362,10 @@ impl<T> [T] {
/// maintained.
///
/// This method splits the slice into three distinct slices: prefix, correctly aligned middle
/// slice of a new type, and the suffix slice. The method does a best effort to make the
/// middle slice the greatest length possible for a given type and input slice, but only
/// your algorithm's performance should depend on that, not its correctness.
/// slice of a new type, and the suffix slice. The method may make the middle slice the greatest
/// length possible for a given type and input slice, but only your algorithm's performance
/// should depend on that, not its correctness. It is permissible for all of the input data to
/// be returned as the prefix or suffix slice.
///
/// This method has no purpose when either input element `T` or output element `U` are
/// zero-sized and will return the original slice without splitting anything.