272db8af1b
This does not add missing release notes, and it doesn't do anything about the profiles feature we would really like to have so we can have consistent credit. Change-Id: I72a6f7acfcff85f380be17dac76501a6f4693776
9 lines
442 B
Markdown
9 lines
442 B
Markdown
---
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synopsis: "`inherit (x) ...` evaluates `x` only once"
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prs: 9847
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category: Fixes
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credits: horrors
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`inherit (x) a b ...` now evaluates the expression `x` only once for all inherited attributes rather than once for each inherited attribute.
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This does not usually have a measurable impact, but side-effects (such as `builtins.trace`) would be duplicated and expensive expressions (such as derivations) could cause a measurable slowdown.
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