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tests/functional/lang: Add sort stability test for lists langer than 16 elements

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libstdc++'s std::stable_sort and new builtins.sort implementation
special-case ranges with length less than or equal to 16 and delegate
to insertionsort.

Having a larger e2e test would allow catching sort stability issues
at functional level as well.
This commit is contained in:
Sergei Zimmerman 2025-06-15 16:51:44 +00:00
parent ddcfc81ff1
commit f9170a84f6
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2 changed files with 75 additions and 1 deletions
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74
tests/functional/lang/eval-okay-sort.nix
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@ -37,6 +37,80 @@ with builtins;
value = "fnord";
}
])
(sort (x: y: x.key < y.key) [
{
key = 1;
value = "foo";
}
{
key = 2;
value = "bar";
}
{
key = 1;
value = "foo2";
}
{
key = 2;
value = "bar2";
}
{
key = 2;
value = "bar3";
}
{
key = 2;
value = "bar4";
}
{
key = 1;
value = "foo3";
}
{
key = 3;
value = "baz";
}
{
key = 3;
value = "baz2";
}
{
key = 1;
value = "foo4";
}
{
key = 3;
value = "baz3";
}
{
key = 1;
value = "foo5";
}
{
key = 1;
value = "foo6";
}
{
key = 2;
value = "bar5";
}
{
key = 3;
value = "baz4";
}
{
key = 1;
value = "foo7";
}
{
key = 4;
value = "biz1";
}
{
key = 1;
value = "foo8";
}
])
(sort lessThan [
[
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