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-rw-r--r--kernel/rtlil.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index e12d9d049..7279835ea 100644
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -369,7 +369,7 @@ namespace RTLIL
return result;
}
- bool in(IdString rhs) const { return *this == rhs; }
+ bool in(const IdString &rhs) const { return *this == rhs; }
bool in(const char *rhs) const { return *this == rhs; }
bool in(const std::string &rhs) const { return *this == rhs; }
bool in(const pool<IdString> &rhs) const { return rhs.count(*this) != 0; }