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由 Niko Matsakis 提交于
adjusting a few foreign functions that were declared with by-ref mode. This also allows us to remove by-val mode in the near future. With copy mode, though, we have to be careful because Rust will implicitly pass somethings by pointer but this may not be the C ABI rules. For example, rust will pass a struct Foo as a Foo*. So I added some code into the adapters to fix this (though the C ABI rules may put the pointer back, oh well). This patch also includes a lint mode for the use of by-ref mode in foreign functions as the semantics of this have changed.
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