forceAttrs: make pos mandatory

src/libcmd/installables.cc

@@ -522,7 +522,7 @@ ref<eval_cache::EvalCache> openEvalCache(
             auto vFlake = state.allocValue();
             flake::callFlake(state, *lockedFlake, *vFlake);
 
-            state.forceAttrs(*vFlake);
+            state.forceAttrs(*vFlake, noPos);
 
             auto aOutputs = vFlake->attrs->get(state.symbols.create("outputs"));
             assert(aOutputs);

src/libexpr/eval-cache.cc

@@ -336,7 +336,7 @@ Value & AttrCursor::getValue()
     if (!_value) {
         if (parent) {
             auto & vParent = parent->first->getValue();
-            root->state.forceAttrs(vParent);
+            root->state.forceAttrs(vParent, vParent.determinePos(noPos));
             auto attr = vParent.attrs->get(parent->second);
             if (!attr)
                 throw Error("attribute '%s' is unexpectedly missing", getAttrPathStr());

src/libexpr/eval.cc

@@ -1132,7 +1132,7 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
            Hence we need __overrides.) */
         if (hasOverrides) {
             Value * vOverrides = (*v.attrs)[overrides->second.displ].value;
-            state.forceAttrs(*vOverrides);
+            state.forceAttrs(*vOverrides, vOverrides->determinePos(noPos));
             Bindings * newBnds = state.allocBindings(v.attrs->capacity() + vOverrides->attrs->size());
             for (auto & i : *v.attrs)
                 newBnds->push_back(i);

src/libexpr/get-drvs.cc

@@ -107,7 +107,7 @@ DrvInfo::Outputs DrvInfo::queryOutputs(bool onlyOutputsToInstall)
                 string name = state->forceStringNoCtx(*elem, *i->pos);
                 Bindings::iterator out = attrs->find(state->symbols.create(name));
                 if (out == attrs->end()) continue; // FIXME: throw error?
-                state->forceAttrs(*out->value);
+                state->forceAttrs(*out->value, *i->pos);
 
                 /* And evaluate its ‘outPath’ attribute. */
                 Bindings::iterator outPath = out->value->attrs->find(state->sOutPath);

src/libexpr/primops.cc

@@ -214,7 +214,7 @@ static void import(EvalState & state, const Pos & pos, Value & vPath, Value * vS
         if (!vScope)
             state.evalFile(path, v);
         else {
-            state.forceAttrs(*vScope);
+            state.forceAttrs(*vScope, pos);
 
             Env * env = &state.allocEnv(vScope->attrs->size());
             env->up = &state.baseEnv;
@@ -2485,7 +2485,7 @@ static void prim_zipAttrsWith(EvalState & state, const Pos & pos, Value * * args
     for (unsigned int n = 0; n < listSize; ++n) {
         Value * vElem = listElems[n];
         try {
-            state.forceAttrs(*vElem);
+            state.forceAttrs(*vElem, noPos);
             for (auto & attr : *vElem->attrs)
                 attrsSeen[attr.name].first++;
         } catch (TypeError & e) {

src/nix/flake.cc

@@ -124,12 +124,13 @@ struct CmdFlakeLock : FlakeCommand
 static void enumerateOutputs(EvalState & state, Value & vFlake,
     std::function<void(const std::string & name, Value & vProvide, const Pos & pos)> callback)
 {
-    state.forceAttrs(vFlake);
+    auto pos = vFlake.determinePos(noPos);
+    state.forceAttrs(vFlake, pos);
 
     auto aOutputs = vFlake.attrs->get(state.symbols.create("outputs"));
     assert(aOutputs);
 
-    state.forceAttrs(*aOutputs->value);
+    state.forceAttrs(*aOutputs->value, pos);
 
     auto sHydraJobs = state.symbols.create("hydraJobs");
 

src/nix/prefetch.cc

@@ -28,7 +28,7 @@ string resolveMirrorUrl(EvalState & state, string url)
     Value vMirrors;
     // FIXME: use nixpkgs flake
     state.eval(state.parseExprFromString("import <nixpkgs/pkgs/build-support/fetchurl/mirrors.nix>", "."), vMirrors);
-    state.forceAttrs(vMirrors);
+    state.forceAttrs(vMirrors, noPos);
 
     auto mirrorList = vMirrors.attrs->find(state.symbols.create(mirrorName));
     if (mirrorList == vMirrors.attrs->end())
@@ -196,7 +196,7 @@ static int main_nix_prefetch_url(int argc, char * * argv)
             Value vRoot;
             state->evalFile(path, vRoot);
             Value & v(*findAlongAttrPath(*state, attrPath, autoArgs, vRoot).first);
-            state->forceAttrs(v);
+            state->forceAttrs(v, noPos);
 
             /* Extract the URL. */
             auto & attr = v.attrs->need(state->symbols.create("urls"));

src/nix/repl.cc

@@ -342,7 +342,7 @@ StringSet NixRepl::completePrefix(string prefix)
             Expr * e = parseString(expr);
             Value v;
             e->eval(*state, *env, v);
-            state->forceAttrs(v);
+            state->forceAttrs(v, noPos);
 
             for (auto & i : *v.attrs) {
                 string name = i.name;
@@ -673,7 +673,7 @@ void NixRepl::reloadFiles()
 
 void NixRepl::addAttrsToScope(Value & attrs)
 {
-    state->forceAttrs(attrs);
+    state->forceAttrs(attrs, attrs.determinePos(noPos));
     if (displ + attrs.attrs->size() >= envSize)
         throw Error("environment full; cannot add more variables");