Implement fsplit_pat_vars for assign
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@ -1930,13 +1930,14 @@ pat_vars(Ps) when is_list(Ps) -> [X || P <- Ps, X <- pat_vars(P)].
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-spec fsplit_pat_vars(fsplit_pat()) -> [var_name()].
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fsplit_pat_vars({var, X}) -> [X || X /= "_"];
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fsplit_pat_vars({bool, _}) -> [];
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fsplit_pat_vars({int, _}) -> [];
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fsplit_pat_vars({string, _}) -> [];
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fsplit_pat_vars(nil) -> [];
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fsplit_pat_vars({'::', P, Q}) -> [P, Q];
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fsplit_pat_vars({bool, _}) -> [];
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fsplit_pat_vars({int, _}) -> [];
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fsplit_pat_vars({string, _}) -> [];
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fsplit_pat_vars(nil) -> [];
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fsplit_pat_vars({'::', P, Q}) -> [P, Q];
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fsplit_pat_vars({tuple, Ps}) -> Ps;
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fsplit_pat_vars({con, _, _, Ps}) -> Ps.
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fsplit_pat_vars({con, _, _, Ps}) -> Ps;
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fsplit_pat_vars({assign, X, P}) -> [X, P].
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-spec free_vars(fexpr() | [fexpr()]) -> [var_name()].
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free_vars(Xs) when is_list(Xs) ->
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