Nor is it the case that changing a .rs file in the compiler causes an LLVM rebuild. Again, this has *never* been the case.
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You can fix this in the build system, if you can write a function that produces the data the downstream consumer cares about so it can be hashed. Not saying that's the best approach, since I don't know the rest of the context.
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Yes, that’s what I was saying earlier. My point is that writing those incremental compilation hooks is the hard part, and is compiler work that has to happen before we can even talk about build systems. (And adding that support to Cargo/rustbuild is easy.)
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Doc comment syntax is just syntactic sugar for function attributes, which are written into metadata.
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