Improve progress indicator

src/libexpr/eval.cc

@@ -642,7 +642,7 @@ void EvalState::evalFile(const Path & path, Value & v)
         return;
     }
 
-    Activity act(*logger, lvlTalkative, format("evaluating file ‘%1%’") % path2);
+    printTalkative("evaluating file ‘%1%’", path2);
     Expr * e = parseExprFromFile(checkSourcePath(path2));
     try {
         eval(e, v);