treewide: Remove usage of isNull

isNull "is deprecated; just write e == null instead" says the Nix manual
2019-04-29 14:05:50 +02:00
parent 5f14e83bd6
commit 786f02f7a4
52 changed files with 89 additions and 95 deletions
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
  version = "128";
  
  src =
-    if builtins.isNull releasePath then
+    if releasePath == null then
      throw ''
        This nix expression requires that the cplex installer is already
        downloaded to your machine. Get it from IBM: