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-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix
new file mode 100644
index 0000000000..bc7a16ded8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix
@@ -0,0 +1,3 @@
+# Negative start is illegal, but negative length works, see
+# eval-okay-builtins-substring-negative-length.nix
+builtins.substring (-1) 1 "Wiggly Donkers"