refactor(3p/nix/libexpr): state->allocBindings -> Bindings::NewGC r/805

EvalState::allocBindings had little to do with Bindings, other than
returning them, and didn't belong in that class.

1 files changed, 1 insertions, 1 deletions

diff --git a/third_party/nix/src/nix/upgrade-nix.cc b/third_party/nix/src/nix/upgrade-nix.cc
index 9b060a7f195a..08c411f4b4c5 100644
--- a/third_party/nix/src/nix/upgrade-nix.cc
+++ b/third_party/nix/src/nix/upgrade-nix.cc
@@ -151,7 +151,7 @@ struct CmdUpgradeNix : MixDryRun, StoreCommand {
     auto state = std::make_unique<EvalState>(Strings(), store);
     auto v = state->allocValue();
     state->eval(state->parseExprFromString(*res.data, "/no-such-path"), *v);
-    Bindings& bindings(*state->allocBindings(0));
+    Bindings& bindings(*Bindings::NewGC());
     auto v2 = findAlongAttrPath(*state, settings.thisSystem, bindings, *v);
 
     return state->forceString(*v2);