don't lose metadata by passing around bare symbols

Author: pepijndevos

src/systems/abstractsystem.jl

@@ -345,7 +345,7 @@ function namespace_expr(O,name,iv) where {T}
     if istree(O)
         renamed = map(a->namespace_expr(a,name,iv), arguments(O))
         if operation(O) isa Sym
-            rename(O,getname(renamespace(name, O)))
+            renamespace(name, O)
         else
             similarterm(O,operation(O),renamed)
         end

test/variable_scope.jl

@@ -12,6 +12,7 @@ d = GlobalScope(d)
 LocalScope(e.val)
 ParentScope(e.val)
 GlobalScope(e.val)
+@test ModelingToolkit.getname(ModelingToolkit.namespace_expr(ModelingToolkit.namespace_expr(b, :foo, t), :bar, t)) == :bar₊b
 
 renamed(nss, sym) = ModelingToolkit.getname(foldr(ModelingToolkit.renamespace, nss, init=sym))