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-# Built-in Constants
-
-Here are the constants built into the Nix expression evaluator:
-
- - `builtins`\
- The set `builtins` contains all the built-in functions and values.
- You can use `builtins` to test for the availability of features in
- the Nix installation, e.g.,
-
- ```nix
- if builtins ? getEnv then builtins.getEnv "PATH" else ""
- ```
-
- This allows a Nix expression to fall back gracefully on older Nix
- installations that don’t have the desired built-in function.
-
- - `builtins.currentSystem`\
- The built-in value `currentSystem` evaluates to the Nix platform
- identifier for the Nix installation on which the expression is being
- evaluated, such as `"i686-linux"` or `"x86_64-darwin"`.