message: Pass 'import_scope' when calling from_control_flow_context_def.
diff: @@ -1790,7 +1790,7 @@ class CondContext(ControlFlowContext):
  ret.Enter()
  for nested_def in context_def.nested_contexts:
  - from_control_flow_context_def(nested_def)
  + from_control_flow_context_def(nested_def, import_scope=import_scope)
  ret.Exit()
  return ret
  