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-rw-r--r--lib/strings.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/strings.nix b/lib/strings.nix
index 49fa0196a0b..86c92bdaa15 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -95,7 +95,7 @@ rec {
      result with the specified separator interspersed between
      elements.
 
-     Type: concatMapStringsSep :: string -> (string -> string) -> [string] -> string
+     Type: concatMapStringsSep :: string -> (a -> string) -> [a] -> string
 
      Example:
         concatMapStringsSep "-" (x: toUpper x)  ["foo" "bar" "baz"]
@@ -112,7 +112,7 @@ rec {
   /* Same as `concatMapStringsSep`, but the mapping function
      additionally receives the position of its argument.
 
-     Type: concatIMapStringsSep :: string -> (int -> string -> string) -> [string] -> string
+     Type: concatIMapStringsSep :: string -> (int -> a -> string) -> [a] -> string
 
      Example:
        concatImapStringsSep "-" (pos: x: toString (x / pos)) [ 6 6 6 ]