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/libstore/http-binary-cache-store.cc b/third_party/nix/src/libstore/http-binary-cache-store.cc
index 1a46423b3542..c75d5f2860a7 100644
--- a/third_party/nix/src/libstore/http-binary-cache-store.cc
+++ b/third_party/nix/src/libstore/http-binary-cache-store.cc
@@ -94,7 +94,7 @@ class HttpBinaryCacheStore : public BinaryCacheStore {
   void upsertFile(const std::string& path, const std::string& data,
                   const std::string& mimeType) override {
     auto req = DownloadRequest(cacheUri + "/" + path);
-    req.data = std::make_shared<string>(data);  // FIXME: inefficient
+    req.data = std::make_shared<std::string>(data);  // FIXME: inefficient
     req.mimeType = mimeType;
     try {
       getDownloader()->download(req);