未定义FieldA.Eq（类型cqlc.BooleanColumn没有字段或方法Eq）

I am using cqlc for querying cassandra. When I try to run SELECT statement

    ctx := cqlc.NewContext()
    iter, err := ctx.Select().
                 From(X).
                 Where(
                   X.A.Eq(true),
                   X.B.Eq(cityID)).
                 Fetch(c.session)

it throws me the following error

X.A.Eq undefined (type cqlc.BooleanColumn has no field or method Eq)

X.A is a boolean column

type BooleanColumn

type BooleanColumn interface {
    Column
    To(value *bool) ColumnBinding
}

type EqualityBooleanColumn

type EqualityBooleanColumn interface {
    BooleanColumn
    Eq(value bool) Condition
}

X.A.Eq undefined (type cqlc.BooleanColumn has no field or method Eq)

That is true.