All that's left is making the test program use our copied over bar() instead of the original foo(). But how can we do that?
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However, for the specific problem of generic programming the trade-off doesn't hold up. The alternative—type classes, as in Haskell, or traits, as in Rust—gives ad hoc polymorphism (functions that behave differently depending on the type) while preserving parametricity. We get specialisation where we ask for it, and reasoning guarantees everywhere else. It's extensible, too: anyone can add a new type to an existing type class. Zig's comptime dispatch is not.，详情可参考移动版官网
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