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| author | Alyssa Ross <hi@alyssa.is> | 2019-04-17 15:55:57 +0100 |
|---|---|---|
| committer | Alyssa Ross <hi@alyssa.is> | 2019-04-17 15:55:57 +0100 |
| commit | 7ed977e60d594929f290d5b31586c08ae674c695 (patch) | |
| tree | 061f2d7e4fa94835eb5e5d024d0232329d70f4c3 /lib/fixed-points.nix | |
| parent | 6336f9e6ea25bcc3f8049d56c660ebed5ac7d943 (diff) | |
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lib.converge: optimise
Diffstat (limited to 'lib/fixed-points.nix')
| -rw-r--r-- | lib/fixed-points.nix | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/fixed-points.nix b/lib/fixed-points.nix index 2f818c88de5..968930526a6 100644 --- a/lib/fixed-points.nix +++ b/lib/fixed-points.nix @@ -30,9 +30,12 @@ rec { # nix-repl> converge (x: x / 2) 16 # 0 converge = f: x: - if (f x) == x - then x - else converge f (f x); + let + x' = f x; + in + if x' == x + then x + else converge f x'; # Modify the contents of an explicitly recursive attribute set in a way that # honors `self`-references. This is accomplished with a function |