1 files changed, 5 insertions, 6 deletions
diff --git a/nix/libutil/serialise.hh b/nix/libutil/serialise.hh
index e5a9df1d05..6a6f028aa6 100644
--- a/nix/libutil/serialise.hh
+++ b/nix/libutil/serialise.hh
@@ -72,9 +72,11 @@ struct BufferedSource : Source
 struct FdSink : BufferedSink
 {
     int fd;
+    bool warn;
+    size_t written;
 
-    FdSink() : fd(-1) { }
-    FdSink(int fd) : fd(fd) { }
+    FdSink() : fd(-1), warn(false), written(0) { }
+    FdSink(int fd) : fd(fd), warn(false), written(0) { }
     ~FdSink();
     
     void write(const unsigned char * data, size_t len);
@@ -95,10 +97,7 @@ struct FdSource : BufferedSource
 struct StringSink : Sink
 {
     string s;
-    void operator () (const unsigned char * data, size_t len)
-    {
-        s.append((const char *) data, len);
-    }
+    void operator () (const unsigned char * data, size_t len);
 };