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-rw-r--r--src/libexpr/eval.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 96bda43a3..e55f28822 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -39,7 +39,7 @@ std::ostream & operator << (std::ostream & str, const Value & v)
str << v.path; // !!! escaping?
break;
case tNull:
- str << "true";
+ str << "null";
break;
case tAttrs: {
str << "{ ";