1 files changed, 6 insertions, 4 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 5e7be5fcd813..28ec2e3989a7 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -132,7 +132,7 @@ struct EvalState;
 std::ostream & operator << (std::ostream & str, Value & v);
 
 
-struct EvalState 
+class EvalState 
 {
     DrvRoots drvRoots;
     DrvHashes drvHashes; /* normalised derivation hashes */
@@ -144,6 +144,8 @@ struct EvalState
 
     bool allowUnsafeEquality;
 
+public:
+    
     EvalState();
 
     /* Evaluate an expression read from the given file to normal
@@ -214,6 +216,9 @@ public:
     Env & allocEnv();
 
     void mkList(Value & v, unsigned int length);
+
+    /* Print statistics. */
+    void printStats();
 };
 
 
@@ -244,9 +249,6 @@ ATermList flattenList(EvalState & state, Expr e);
 Expr autoCallFunction(Expr e, const ATermMap & args);
 #endif
 
-/* Print statistics. */
-void printEvalStats(EvalState & state);
-
 
 }