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It's well known that certain compiler optimisations matter way more than others (e.g. inlining).
Is there a similar principle for linters? I find red squiggles under unused/undefined variables the single most useful check.
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Go has a wonderful, accessible discussion of how it does inlining today, the downsides, and the plans for 1.22:
On the nuances of Rust inlining, crate boundaries, and what gets inlined by default: https://matklad.github.io/2021/07/09/inline-in-rust.html
Mid stack inlining in Go: https://go.googlesource.com/proposal/+/master/design/19348-midstack-inlining.md
(Interesting implementation details: the inliner is AST based, how to preserve existing stack reflection APIs, and how to show good tracebacks.)