style(3p/nix): Remove 'using std::*' from types.hh r/840

It is considered bad form to use things from includes in headers, as
these directives propagate to everywhere else and can make it
confusing.

types.hh (which is includes almost literally everywhere) had some of
these directives, which this commit removes.

1 files changed, 1 insertions, 1 deletions

diff --git a/third_party/nix/src/nix-collect-garbage/nix-collect-garbage.cc b/third_party/nix/src/nix-collect-garbage/nix-collect-garbage.cc
index 0050bdda15fb..548e492664de 100644
--- a/third_party/nix/src/nix-collect-garbage/nix-collect-garbage.cc
+++ b/third_party/nix/src/nix-collect-garbage/nix-collect-garbage.cc
@@ -40,7 +40,7 @@ void removeOldGenerations(const std::string& dir) {
           continue;
         }
       }
-      if (link.find("link") != string::npos) {
+      if (link.find("link") != std::string::npos) {
         LOG(INFO) << "removing old generations of profile " << path;
         if (!deleteOlderThan.empty()) {
           deleteGenerationsOlderThan(path, deleteOlderThan, dryRun);