Changed comment to better reflect std's exceptional situation
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@ -374,11 +374,11 @@ where
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// FIXME(danielhenrymantilla): #42788
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//
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// - This creates a (mut) reference to a slice of
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// _uninitialized integers_.
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// _uninitialized_ integers, which is **undefined behavior**
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//
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// - This having defined behavior is **unstable**:
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// it could become UB in the future,
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// at which point it would have be changed.
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// - Only the standard library gets to soundly "ignore" this,
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// based on its privileged knowledge of unstable rustc
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// internals;
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g.buf.reserve(reservation_size(r));
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let capacity = g.buf.capacity();
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g.buf.set_len(capacity);
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