# MutantHub mutant #989: Arithmetic operator mutation at descriptor.cpp:3039
# Repository: bitcoin/bitcoin @ 1aafd49077041e874d6b5f114927bc37e5b85d71
# File: src/script/descriptor.cpp:3039-3039
# Review: APPROVED; outcome: KILLED
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -3039,1 +3039,1 @@
-                throw std::runtime_error(std::string(__func__) + ": New cached last hardened xpub does not match already cached last hardened xpub");
+                throw std::runtime_error(std::string(__func__) - ": New cached last hardened xpub does not match already cached last hardened xpub");