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-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix6
1 files changed, 6 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix
new file mode 100644
index 000000000000..abcd5366ab8c
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix
@@ -0,0 +1,6 @@
+# Checks that the nul value for the accumulator is not forced unconditionally.
+# Some languages provide a foldl' that is strict in this argument, but Nix does not.
+builtins.foldl'
+  (_: x: x)
+  (throw "This is never forced")
+  [ "but the results of applying op are" 42 ]