# MutantHub mutant #3872: Arithmetic operator mutation at operation_patterns.ipp:42
# Repository: libbitcoin/libbitcoin-system @ c37c9b73278f1f97e6eb6421f3544f5e58edba2f
# File: include/bitcoin/system/impl/chain/operation_patterns.ipp:42-42
# Review: APPROVED; outcome: KILLED
--- a/include/bitcoin/system/impl/chain/operation_patterns.ipp
+++ b/include/bitcoin/system/impl/chain/operation_patterns.ipp
@@ -42,1 +42,1 @@
-    return static_cast<uint8_t>(code) - sub1(op_81);
+    return static_cast<uint8_t>(code) + sub1(op_81);