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Maybe optional actions (
fn action_var(&mut self, var: & Var) -> Option<var>) can be take argument by value if you roundtrip it back?fn action_var(&mut self, var: Var) -> Var</var>
Maybe optional actions (fn action_var(&mut self, var: & Var) -> Option<var>) can be take argument by value if you roundtrip it back?
fn action_var(&mut self, var: Var) -> Var</var>