diff --git a/pkgs/lib/strings.nix b/pkgs/lib/strings.nix
index 5f2670913e24..071bb2c995b3 100644
--- a/pkgs/lib/strings.nix
+++ b/pkgs/lib/strings.nix
@@ -17,7 +17,7 @@ rec {
   # Map a function over a list and concatenate the resulting strings.
   concatMapStrings = f: list: concatStrings (map f list);
   concatImapStrings = f: list: concatStrings (lib.imap f list);
-  
+
 
   # Place an element between each element of a list, e.g.,
   # `intersperse "," ["a" "b" "c"]' returns ["a" "," "b" "," "c"].
@@ -37,7 +37,7 @@ rec {
   # Construct a Unix-style search path consisting of each `subDir"
   # directory of the given list of packages.  For example,
   # `makeSearchPath "bin" ["x" "y" "z"]' returns "x/bin:y/bin:z/bin".
-  makeSearchPath = subDir: packages: 
+  makeSearchPath = subDir: packages:
     concatStringsSep ":" (map (path: path + "/" + subDir) packages);
 
 
@@ -48,13 +48,13 @@ rec {
 
   # Idem for Perl search paths.
   makePerlPath = makeSearchPath "lib/perl5/site_perl";
-  
+
 
   # Dependening on the boolean `cond', return either the given string
   # or the empty string.
   optionalString = cond: string: if cond then string else "";
 
-  
+
   # Determine whether a filename ends in the given suffix.
   hasSuffix = ext: fileName:
     let lenFileName = stringLength fileName;
@@ -74,7 +74,7 @@ rec {
     then []
     else map (p: substring p 1 s) (lib.range 0 (sub l 1));
 
-    
+
   # Manipulate a string charcater by character and replace them by strings
   # before concatenating the results.
   stringAsChars = f: s:
@@ -82,18 +82,18 @@ rec {
       map f (stringToCharacters s)
     );
 
-    
+
   # same as vim escape function.
   # Each character contained in list is prefixed by "\"
   escape = list : string :
     stringAsChars (c: if lib.elem c list then "\\${c}" else c) string;
 
-    
+
   # still ugly slow. But more correct now
   # [] for zsh
   escapeShellArg = lib.escape (stringToCharacters "\\ ';$`()|<>\t*[]");
 
-  
+
   # replace characters by their substitutes.  This function is equivalent to
   # the `tr' command except that one character can be replace by multiple
   # ones.  e.g.,
@@ -108,12 +108,12 @@ rec {
     in
       stringAsChars subst s;
 
-      
+
   # Compares strings not requiring context equality
   # Obviously, a workaround but works on all Nix versions
   eqStrings = a: b: (a+(substring 0 0 b)) == ((substring 0 0 a)+b);
 
-  
+
   # Cut a string with a separator and produces a list of strings which were
   # separated by this separator. e.g.,
   # `splitString "." "foo.bar.baz"' returns ["foo" "bar" "baz"].
@@ -138,7 +138,7 @@ rec {
     in
       recurse 0 0;
 
-      
+
   # return the suffix of the second argument if the first argument match its
   # prefix. e.g.,
   # `removePrefix "foo." "foo.bar.baz"' returns "bar.baz".
@@ -152,9 +152,7 @@ rec {
       else
         s;
 
-        
   # Return true iff string v1 denotes a version older than v2.
   versionOlder = v1: v2: builtins.compareVersions v2 v1 == 1;
 
-
 }