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-rw-r--r--src/libexpr/eval.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 5f9f5bac1ed6..d418ab4e43aa 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -291,6 +291,8 @@ EvalState::EvalState(const Strings & _searchPath, ref<Store> store)
     , sToString(symbols.create("__toString"))
     , sRight(symbols.create("right"))
     , sWrong(symbols.create("wrong"))
+    , sStructuredAttrs(symbols.create("__structuredAttrs"))
+    , sBuilder(symbols.create("builder"))
     , store(store)
     , baseEnv(allocEnv(128))
     , staticBaseEnv(false, 0)