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>I’d like to see tooling for this to pinpoint bottlenecks - it’s not always obvious what’s making builds slow.

I second this enthusiastically.

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I'll third it. I've started to see more and more cargo culting of "fixes" that I'm extremely suspicious do nothing aside from making the code bulkier.
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> Breaking up long expressions into smaller ones

If it improves compile time, that sounds like a bug in the compiler or the design of the language itself.

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