Add 'third_party/nix/' from commit 'be66c7a6b24e3c3c6157fd37b86c7203d14acf10'

git-subtree-dir: third_party/nix
git-subtree-mainline: cf8cd640c1
git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10

third_party/nix/tests/gc-runtime.nix

@@ -0,0 +1,17 @@
+with import ./config.nix;
+
+mkDerivation {
+  name = "gc-runtime";
+  builder =
+    # Test inline source file definitions.
+    builtins.toFile "builder.sh" ''
+      mkdir $out
+
+      cat > $out/program <<EOF
+      #! ${shell}
+      sleep 10000
+      EOF
+
+      chmod +x $out/program
+    '';
+}