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expr : expr[ var_name ] '+' ident[ other_var_name ] ( some_action(var_name, other_var_name)) | ident[ third_var ] (some_other_action(third_var))
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std::wstring ShiftIdent() {
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    auto ident = current_token->codepoints; // for example
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    current_token++;
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    return ident;
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}
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void ShiftPlus() {
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    current_token++;
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}
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T ShiftExpr() {
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    T t;
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    switch(current_token->type) {
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    case ident:
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        auto internal_var = ShiftIdent();
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        {
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            auto&& third_var = internal_var;
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            t = some_other_action(third_var);
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        }
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        while(true) {
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            switch(current_token->type) {
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            case '+':
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                ShiftPlus();
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                switch(current_token->type) {
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                case ident:
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                    auto&& other_var_name = ShiftIdent();
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                    {
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                        auto&& var_name = t;
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                        t = some_action(var_name, other_var_name));
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                    };
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                    continue;
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                default:
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                    error();
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                }
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            case end:
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                break;
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            default:
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                error();
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            };
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        }
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        break;
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    default:
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        error();
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    }
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    return std::move(t);
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}

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