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-rw-r--r--tests/functional/lang/eval-okay-substring.nix2
1 files changed, 2 insertions, 0 deletions
diff --git a/tests/functional/lang/eval-okay-substring.nix b/tests/functional/lang/eval-okay-substring.nix
index 424af00d9..54c97e162 100644
--- a/tests/functional/lang/eval-okay-substring.nix
+++ b/tests/functional/lang/eval-okay-substring.nix
@@ -19,3 +19,5 @@ substring 1 2 s
+ substring 3 1 s
+ "c"
+ substring 5 10 "perl"
++ "_"
++ substring 3 (-1) "tebbad"