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| author | John Ericson <John.Ericson@Obsidian.Systems> | 2023-06-27 09:32:40 -0400 |
|---|---|---|
| committer | John Ericson <John.Ericson@Obsidian.Systems> | 2023-06-27 09:34:36 -0400 |
| commit | 4da7c866181c699b43d3cd2fff0afd2505774be7 (patch) | |
| tree | 60649bb193c43f50b78d1d19d60e5a924046f3fd | |
| parent | e8067daf0955c297f389c968dab3e927b395de07 (diff) | |
Switch example to a primop this is less ill-advised
Any primop will do for this, so might as well use one that isn't impure.
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
| -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) |