Merge branch 'register-constant' of https://github.com/shlevy/nix

tests/plugins.sh

@@ -2,6 +2,6 @@ source common.sh
 
 set -o pipefail
 
-res=$(nix eval '(builtins.constNull true)' --option plugin-files $PWD/plugins/plugintest.so)
+res=$(nix eval '(builtins.anotherNull)' --option plugin-files $PWD/plugins/plugintest.so)
 
 [ "$res"x = "nullx" ]

tests/plugins/plugintest.cc

@@ -2,9 +2,9 @@
 
 using namespace nix;
 
-static void prim_constNull (EvalState & state, const Pos & pos, Value ** args, Value & v)
+static void prim_anotherNull (EvalState & state, const Pos & pos, Value ** args, Value & v)
 {
     mkNull(v);
 }
 
-static RegisterPrimOp r("constNull", 1, prim_constNull);
+static RegisterPrimOp r("anotherNull", 0, prim_anotherNull);