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-rw-r--r--src/libexpr/value-to-json.cc3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/libexpr/value-to-json.cc b/src/libexpr/value-to-json.cc
index 6a95e0414..03504db61 100644
--- a/src/libexpr/value-to-json.cc
+++ b/src/libexpr/value-to-json.cc
@@ -100,8 +100,7 @@ void printValueAsJSON(EvalState & state, bool strict,
void ExternalValueBase::printValueAsJSON(EvalState & state, bool strict,
JSONPlaceholder & out, PathSet & context) const
{
- auto e = TypeError("cannot convert %1% to JSON", showType());
- state.debugThrowLastTrace(e);
+ state.debugThrowLastTrace(TypeError("cannot convert %1% to JSON", showType()));
}