union alloc_header *h = x;h--;
在任期間，阿里‧哈梅內伊僅泛泛地談論過伊朗未來領導人的問題。
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"We're now busy building a line-up of some of the world's most loved artists to perform live for tens of thousands of people in the park, as well as for millions of listeners and viewers at home or on the move."
With provider traits, we can now rewrite our ad-hoc serialize functions to implement the SerializeImpl provider trait. For the case of DurationDef, we would implement the trait with Duration specified as the value type in the generic parameter, whereas after the for keyword, we use DurationDef as the Self type to implement SerializeImpl. With this, the Self type effectively becomes an identifier to name a specific implementation of a provider trait.