Make a copy of the outputs argument in FunctionGraph

aesara/graph/fg.py

@@ -137,8 +137,7 @@ class FunctionGraph(utils.MetaObject):
         # outputs even if they aren't used in the graph.
         self.variables = set()
 
-        # TODO FIXME: We should *not* be using a list created elsewhere!
-        self.outputs = outputs
+        self.outputs = list(outputs)
         self.clients = {}
 
         for f in features:

aesara/graph/toolbox.py

@@ -821,7 +821,7 @@ def is_same_graph_with_merge(var1, var2, givens=None):
     # which happens when the graph is made of a single Variable.
     # We also need to make sure we replace a Variable if it is present in
     # `givens`.
-    vars_replaced = [givens.get(v, v) for v in vars]
+    vars_replaced = [givens.get(v, v) for v in fgraph.outputs]
     o1, o2 = [v.owner for v in vars_replaced]
     if o1 is None and o2 is None:
         # Comparing two single-Variable graphs: they are equal if they are