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-rw-r--r--src/libexpr/eval.cc6
-rw-r--r--src/libexpr/primops.cc3
2 files changed, 3 insertions, 6 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index e09297546c95..30dbb17fb67a 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -1076,6 +1076,8 @@ void EvalState::callPrimOp(Value & fun, Value & arg, Value & v, const Pos & pos)
 
 void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & pos)
 {
+    forceValue(fun, pos);
+
     if (fun.type == tPrimOp || fun.type == tPrimOpApp) {
         callPrimOp(fun, arg, v, pos);
         return;
@@ -1091,10 +1093,8 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & po
         auto & fun2 = *allocValue();
         fun2 = fun;
         /* !!! Should we use the attr pos here? */
-        forceValue(*found->value, pos);
         Value v2;
         callFunction(*found->value, fun2, v2, pos);
-        forceValue(v2, pos);
         return callFunction(v2, arg, v, pos);
       }
     }
@@ -1181,7 +1181,6 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
     if (fun.type == tAttrs) {
         auto found = fun.attrs->find(sFunctor);
         if (found != fun.attrs->end()) {
-            forceValue(*found->value);
             Value * v = allocValue();
             callFunction(*found->value, fun, *v, noPos);
             forceValue(*v);
@@ -1565,7 +1564,6 @@ string EvalState::coerceToString(const Pos & pos, Value & v, PathSet & context,
     if (v.type == tAttrs) {
         auto i = v.attrs->find(sToString);
         if (i != v.attrs->end()) {
-            forceValue(*i->value, pos);
             Value v1;
             callFunction(*i->value, v, v1, pos);
             return coerceToString(pos, v1, context, coerceMore, copyToStore);
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index e71e3a6d46cb..e7b319fea642 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -1359,7 +1359,6 @@ static void prim_functionArgs(EvalState & state, const Pos & pos, Value * * args
 /* Apply a function to every element of an attribute set. */
 static void prim_mapAttrs(EvalState & state, const Pos & pos, Value * * args, Value & v)
 {
-    state.forceFunction(*args[0], pos);
     state.forceAttrs(*args[1], pos);
 
     state.mkAttrs(v, args[1]->attrs->size());
@@ -1368,7 +1367,7 @@ static void prim_mapAttrs(EvalState & state, const Pos & pos, Value * * args, Va
         Value * vName = state.allocValue();
         Value * vFun2 = state.allocValue();
         mkString(*vName, i.name);
-        state.callFunction(*args[0], *vName, *vFun2, pos);
+        mkApp(*vFun2, *args[0], *vName);
         mkApp(*state.allocAttr(v, i.name), *vFun2, *i.value);
     }
 }