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| -rw-r--r-- | doc/manual/src/language/builtin-constants.md | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/manual/src/language/builtin-constants.md b/doc/manual/src/language/builtin-constants.md index e6bc7e915..eb8b53bf0 100644 --- a/doc/manual/src/language/builtin-constants.md +++ b/doc/manual/src/language/builtin-constants.md @@ -9,7 +9,8 @@ These constants are built into the Nix language evaluator: Since built-in functions were added over time, [testing for attributes](./operators.md#has-attribute) in `builtins` can be used for graceful fallback on older Nix installations: ```nix - if builtins ? getEnv then builtins.getEnv "PATH" else "" + # if hasContext is not available, we assume `s` has a context + if builtins ? hasContext then builtins.hasContext s else true ``` - [`builtins.currentSystem`]{#builtins-currentSystem} (string) |