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-rw-r--r--src/libexpr/eval.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 437c7fc53..b87e06ef5 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -436,6 +436,7 @@ EvalState::EvalState(
, sBuilder(symbols.create("builder"))
, sArgs(symbols.create("args"))
, sContentAddressed(symbols.create("__contentAddressed"))
+ , sImpure(symbols.create("__impure"))
, sOutputHash(symbols.create("outputHash"))
, sOutputHashAlgo(symbols.create("outputHashAlgo"))
, sOutputHashMode(symbols.create("outputHashMode"))