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-rw-r--r--src/libexpr/eval-test.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/eval-test.cc b/src/libexpr/eval-test.cc
index 6f686bd6b604..983cac9515fe 100644
--- a/src/libexpr/eval-test.cc
+++ b/src/libexpr/eval-test.cc
@@ -686,6 +686,7 @@ void run(Strings args)
     doTest("true == false");
     doTest("__head [ 1 2 3 ]");
     doTest("__add 1 2");
+    doTest("null");
     doTest("\"foo\"");
     doTest("let s = \"bar\"; in \"foo${s}\"");