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-rw-r--r--src/libexpr/eval.cc4
-rw-r--r--src/libexpr/eval.hh3
-rw-r--r--src/libexpr/primops.cc18
3 files changed, 15 insertions, 10 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 48542d8e5006..2144d3452579 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -294,6 +294,10 @@ EvalState::EvalState(const Strings & _searchPath, ref<Store> store)
     , sWrong(symbols.create("wrong"))
     , sStructuredAttrs(symbols.create("__structuredAttrs"))
     , sBuilder(symbols.create("builder"))
+    , sArgs(symbols.create("args"))
+    , sOutputHash(symbols.create("outputHash"))
+    , sOutputHashAlgo(symbols.create("outputHashAlgo"))
+    , sOutputHashMode(symbols.create("outputHashMode"))
     , repair(NoRepair)
     , store(store)
     , baseEnv(allocEnv(128))
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 51905d7e1c62..9d8799b7906b 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -69,7 +69,8 @@ public:
     const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName, sValue,
         sSystem, sOverrides, sOutputs, sOutputName, sIgnoreNulls,
         sFile, sLine, sColumn, sFunctor, sToString,
-        sRight, sWrong, sStructuredAttrs, sBuilder;
+        sRight, sWrong, sStructuredAttrs, sBuilder, sArgs,
+        sOutputHash, sOutputHashAlgo, sOutputHashMode;
     Symbol sDerivationNix;
 
     /* If set, force copying files to the Nix store even if they
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 89e984d2e589..317623b22f79 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -589,7 +589,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
 
             /* The `args' attribute is special: it supplies the
                command-line arguments to the builder. */
-            if (key == "args") {
+            if (i->name == state.sArgs) {
                 state.forceList(*i->value, pos);
                 for (unsigned int n = 0; n < i->value->listSize(); ++n) {
                     string s = state.coerceToString(posDrvName, *i->value->listElems()[n], context, true);
@@ -614,13 +614,13 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
                         drv.platform = state.forceStringNoCtx(*i->value, posDrvName);
                     else if (i->name == state.sName)
                         drvName = state.forceStringNoCtx(*i->value, posDrvName);
-                    else if (key == "outputHash")
+                    else if (i->name == state.sOutputHash)
                         outputHash = state.forceStringNoCtx(*i->value, posDrvName);
-                    else if (key == "outputHashAlgo")
+                    else if (i->name == state.sOutputHashAlgo)
                         outputHashAlgo = state.forceStringNoCtx(*i->value, posDrvName);
-                    else if (key == "outputHashMode")
+                    else if (i->name == state.sOutputHashMode)
                         handleHashMode(state.forceStringNoCtx(*i->value, posDrvName));
-                    else if (key == "outputs") {
+                    else if (i->name == state.sOutputs) {
                         /* Require ‘outputs’ to be a list of strings. */
                         state.forceList(*i->value, posDrvName);
                         Strings ss;
@@ -638,10 +638,10 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
                         drvName = s;
                         printMsg(lvlVomit, format("derivation name is '%1%'") % drvName);
                     }
-                    else if (key == "outputHash") outputHash = s;
-                    else if (key == "outputHashAlgo") outputHashAlgo = s;
-                    else if (key == "outputHashMode") handleHashMode(s);
-                    else if (key == "outputs")
+                    else if (i->name == state.sOutputHash) outputHash = s;
+                    else if (i->name == state.sOutputHashAlgo) outputHashAlgo = s;
+                    else if (i->name == state.sOutputHashMode) handleHashMode(s);
+                    else if (i->name == state.sOutputs)
                         handleOutputs(tokenizeString<Strings>(s));
                 }