Function lower_inc 

pub fn lower_inc<R: MultirangeOrRangeMaybeNullable + SingleValue + MaybeNullableValue<Bool>, range>(
    range: range,
) -> lower_inc<R, range>
where
    range: AsExpression<R>,

Available on crate feature postgres_backend only.

Returns true if the range’s lower bound is inclusive

Example

let int =
    diesel::select(lower_inc::<Range<Integer>, _>(1..5)).get_result::<bool>(connection)?;
assert_eq!(true, int);

let int = diesel::select(lower_inc::<Range<Integer>, _>(..5)).get_result::<bool>(connection)?;
assert_eq!(false, int);

let int = diesel::select(lower_inc::<Nullable<Range<Integer>>, _>(
    None::<std::ops::Range<i32>>,
))
.get_result::<Option<bool>>(connection)?;
assert_eq!(None, int);

let int = diesel::select(lower_inc::<Multirange<Integer>, _>(vec![5..7]))
    .get_result::<bool>(connection)?;
assert_eq!(true, int);