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-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-fib.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-fib.nix7
2 files changed, 8 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-fib.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-fib.exp
new file mode 100644
index 000000000000..8643cf6debac
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-fib.exp
@@ -0,0 +1 @@
+89
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-fib.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-fib.nix
new file mode 100644
index 000000000000..9a22d85ac5f1
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-fib.nix
@@ -0,0 +1,7 @@
+let
+  fib' = i: n: m: if i == 0
+    then n
+    else fib' (i - 1) m (n + m);
+
+  fib = n: fib' n 1 1;
+in fib 10