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-rw-r--r--lib/meta.nix4
-rw-r--r--pkgs/applications/science/biology/ncbi-tools/default.nix2
-rw-r--r--pkgs/stdenv/generic/default.nix2
3 files changed, 4 insertions, 4 deletions
diff --git a/lib/meta.nix b/lib/meta.nix
index 44e3cc011f18..ae652e579c39 100644
--- a/lib/meta.nix
+++ b/lib/meta.nix
@@ -45,7 +45,7 @@ rec {
   /* Decrease the nix-env priority of the package, i.e., other
      versions/variants of the package will be preferred.
   */
-  lowPrio = drv: addMetaAttrs { priority = "10"; } drv;
+  lowPrio = drv: addMetaAttrs { priority = 10; } drv;
 
 
   /* Apply lowPrio to an attrset with derivations
@@ -56,7 +56,7 @@ rec {
   /* Increase the nix-env priority of the package, i.e., this
      version/variant of the package will be preferred.
   */
-  hiPrio = drv: addMetaAttrs { priority = "-10"; } drv;
+  hiPrio = drv: addMetaAttrs { priority = -10; } drv;
 
 
   /* Apply hiPrio to an attrset with derivations
diff --git a/pkgs/applications/science/biology/ncbi-tools/default.nix b/pkgs/applications/science/biology/ncbi-tools/default.nix
index e9d99aeb254c..821a80230e50 100644
--- a/pkgs/applications/science/biology/ncbi-tools/default.nix
+++ b/pkgs/applications/science/biology/ncbi-tools/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     longDescription = ''The NCBI Bioinformatics toolsbox, including command-line utilties, libraries and include files. No X11 support'';
     homepage = http://www.ncbi.nlm.nih.gov/IEB/ToolBox/; 
     license = "GPL";
-    priority = "5";   # zlib.so gives a conflict with zlib
+    priority = 5;   # zlib.so gives a conflict with zlib
     broken = true;
   };
 }
diff --git a/pkgs/stdenv/generic/default.nix b/pkgs/stdenv/generic/default.nix
index fcb50bd9ff50..a063a1ed2dc9 100644
--- a/pkgs/stdenv/generic/default.nix
+++ b/pkgs/stdenv/generic/default.nix
@@ -238,7 +238,7 @@ let
 
       checkMetaAttr = k: v:
         if metaTypes?${k} then
-          if metaTypes.${k}.check v then null else "key '${k}' has a value of an invalid type; expected ${metaTypes.${k}.description}"
+          if metaTypes.${k}.check v then null else "key '${k}' has a value ${v} of an invalid type ${builtins.typeOf v}; expected ${metaTypes.${k}.description}"
         else "key '${k}' is unrecognized; expected one of: \n\t      [${lib.concatMapStringsSep ", " (x: "'${x}'") (lib.attrNames metaTypes)}]";
       checkMeta = meta: if shouldCheckMeta then lib.remove null (lib.mapAttrsToList checkMetaAttr meta) else [];