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-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length.nix10
2 files changed, 11 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length.exp
new file mode 100644
index 000000000000..b019be4bfd7a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length.exp
@@ -0,0 +1 @@
+[ 3 "hello" 9 4 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length.nix
new file mode 100644
index 000000000000..b7d51db3c578
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length.nix
@@ -0,0 +1,10 @@
+[
+  (builtins.stringLength "foo")
+  (let s = "hello"; in (builtins.substring 0 (builtins.stringLength s) s))
+  (builtins.stringLength ("foo" + "${"bar" + "baz"}"))
+
+  # feel free to delete this test case at any time, it's just to show: This is a
+  # thing at the moment. We may want to break compatibility with this aspect of
+  # the C++ Nix implementation at any time.
+  (builtins.stringLength "๐Ÿ˜€")
+]