kernel: make IdString::isPublic() const.

diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index a03e8933c599955689d406de9aab1dd1d8b32ecd..cd966b815222440601e25db982cee9aaadf3850f 100644 (file)
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -376,7 +376,7 @@ namespace RTLIL
                bool in(const std::string &rhs) const { return *this == rhs; }
                bool in(const pool<IdString> &rhs) const { return rhs.count(*this) != 0; }
 
-               bool isPublic() { return begins_with("\\"); }
+               bool isPublic() const { return begins_with("\\"); }
        };
 
        namespace ID {