append only once

Author: HenriDeh

src/traces.jl

@@ -149,10 +149,8 @@ for f in (:push!, :pushfirst!, :append!, :prepend!)
         end
     end
     @eval function Base.$f(t::MultiplexTraces{names}, x::RelativeTrace{left, right}) where {names, left, right}
-        if right == 0
+        if right == 0 #do not accept appending the second name as it would be appended twice
             $f(t[first(names)].trace, x.trace)
-        else
-            $f(t[last(names)].trace, x.trace)
         end
     end
 end