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The discussion seems to have resolved that this lint is a bit "noisy" in that applying it in all places would result in a reduction in readability. A few of the trivial functions (like `Path::new`) are fine to leave outside of closures. The general rule seems to be that anything that is obviously an allocation (`Box`, `Vec`, `vec![]`) should be in a closure, even if it is a 0-sized allocation.
This directory contains the source code of the rust project, including:
- The test suite
- The bootstrapping build system
- Various submodules for tools, like rustdoc, rls, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.