Support quoted attribute names in -A

This is requires if you have attribute names with dots in them.  So
you can now say:

  $ nix-instantiate '<nixos>' -A 'config.systemd.units."postgresql.service".text' --eval-only

Fixes #151.

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/export-graph.nix b/tests/export-graph.nix
index 3a0b0368d..fdac9583d 100644
--- a/tests/export-graph.nix
+++ b/tests/export-graph.nix
@@ -14,13 +14,13 @@ rec {
       done < refs
     '';
 
-  runtimeGraph = mkDerivation {
+  foo."bar.runtimeGraph" = mkDerivation {
     name = "dependencies";
     builder = builtins.toFile "build-graph-builder" "${printRefs}";
     exportReferencesGraph = ["refs" (import ./dependencies.nix)];
   };
 
-  buildGraph = mkDerivation {
+  foo."bar.buildGraph" = mkDerivation {
     name = "dependencies";
     builder = builtins.toFile "build-graph-builder" "${printRefs}";
     exportReferencesGraph = ["refs" (import ./dependencies.nix).drvPath];