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# Debugging Nix Expressions {#sec-debug} |
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Nix is a unityped, dynamic language, this means every value can potentially appear anywhere. Since it is also non-strict, evaluation order and what ultimately is evaluated might surprise you. Therefore it is important to be able to debug nix expressions. |
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In the `lib/debug.nix` file you will find a number of functions that help (pretty-)printing values while evaluation is running. You can even specify how deep these values should be printed recursively, and transform them on the fly. Please consult the docstrings in `lib/debug.nix` for usage information. |
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<section xmlns="http://docbook.org/ns/docbook" |
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xmlns:xlink="http://www.w3.org/1999/xlink" |
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xmlns:xi="http://www.w3.org/2001/XInclude" |
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xml:id="sec-debug"> |
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<title>Debugging Nix Expressions</title> |
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<para> |
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Nix is a unityped, dynamic language, this means every value can potentially appear anywhere. Since it is also non-strict, evaluation order and what ultimately is evaluated might surprise you. Therefore it is important to be able to debug nix expressions. |
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</para> |
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<para> |
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In the <literal>lib/debug.nix</literal> file you will find a number of functions that help (pretty-)printing values while evaluation is runnnig. You can even specify how deep these values should be printed recursively, and transform them on the fly. Please consult the docstrings in <literal>lib/debug.nix</literal> for usage information. |
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</para> |
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</section> |
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