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-rw-r--r--tests/lang/eval-fail-substring.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/lang/eval-fail-substring.nix b/tests/lang/eval-fail-substring.nix
new file mode 100644
index 000000000000..f37c2bc0a160
--- /dev/null
+++ b/tests/lang/eval-fail-substring.nix
@@ -0,0 +1 @@
+builtins.substring (builtins.sub 0 1) 1 "x"