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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 4e0af70ba64b..03bf43a3b9a4 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -163,6 +163,8 @@ void mkString(Value & v, const char * s);
 void mkString(Value & v, const string & s, const PathSet & context = PathSet());
 void mkPath(Value & v, const char * s);
 
+void copyContext(const Value & v, PathSet & context);
+
 
 typedef std::map<Path, Hash> DrvHashes;