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-rw-r--r--lib/strings.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/strings.nix b/lib/strings.nix
index 024a9ac7d7a..cd748f02cc6 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -7,7 +7,8 @@ inherit (builtins) add sub lessThan length;
 in
 
 rec {
-  inherit (builtins) stringLength substring head tail;
+
+  inherit (builtins) stringLength substring head tail isString;
 
 
   # Concatenate a list of strings.