1 files changed, 5 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-coerce.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-coerce.nix
new file mode 100644
index 0000000000..626ae1d1be
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-coerce.nix
@@ -0,0 +1,5 @@
+# builtins.substring uses string coercion internally
+
+builtins.substring 0 2 {
+  __toString = _: "4200";
+}