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So is this just because server is known to make rust really slow to build?

I'm curious why rust doesn't just compile your binaries once and then you wouldn't have to compile them on each build

It very much does this. The compile times are hardly a concern to the vast majority of rust devs in part because of that cache.

It generally does cache built crates for future builds on the same system, so it is usually only the initial build on a given system and the build after dependencies are updated that requires rebuilding serde_derive. I honestly don't know why they thought it was worth doing.

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