jade
6d84d6bdc1
This builtin was always a problem and nixpkgs uses it in exactly one
place, to give up if the Nix version is absurdly old. It has no other
use cases, and doesn't work in a multi-implementation world anyway.
Change-Id: I03c36e118591029e2ef14b091fe14a311c66a08a
18 lines
584 B
Markdown
18 lines
584 B
Markdown
---
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synopsis: "`builtins.nixVersion` and `builtins.langVersion` return fixed values"
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cls: [558, 1144]
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credits: jade
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category: Breaking Changes
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---
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`builtins.nixVersion` now returns a fixed value `"2.18.3-lix"`.
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`builtins.langVersion` returns a fixed value `6`, matching CppNix 2.18.
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This prevents feature detection assuming that features that exist in Nix
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post-Lix-branch-off might exist, even though the Lix version is greater than
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the Nix version.
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In the future, check for builtins for feature detection. If a feature cannot be
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detected by *those* means, please file a Lix bug.
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