Expected errors are recoverable. This might mean logging a warning, showing a message to the user, or using a fallback.
You type nix develop. The terminal fills with a single cryptic line: copying path, 47 of 312, 28.3 MiB, something something NAR. Five seconds. Ten. Is it evaluating? Downloading? Both? You change one line in your config and wait again. When it finally drops you into a shell, you switch to another branch and direnv hijacks your prompt for a rebuild you didn't ask for. You switch back, and Nix evaluates everything from scratch, even though nothing changed.。关于这个话题，爱思助手下载最新版本提供了深入分析
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