确保首个子元素占据全部高度与宽度，无底部边距且继承圆角样式，整体容器保持完整尺寸
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return 0; // 0 = ignore (return error to caller)
If we now revisit the hash table problem, the solution provided by CGP is straightforward: we can first use the #[cgp_component] macro to generate the provider trait and blanket implementations for the Hash trait. We then use the #[cgp_impl] macro to implement named providers that can overlap with no restriction.